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Below are preliminary entrants for the 2024 Lottery (December 2, 2023). The Ticket Count refers to the fact that lottery applicants receive additional chances in the drawing for each failure to gain entry in a prior year at 2^(n-1) where n is the number of years entering the lottery. These are preliminary ticket counts.
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| ID | Last Name | First Name | Gender | State | Country | Tickets | Qualifier |
|---|---|---|---|---|---|---|---|
| 105955 | Aagaard | Jakob | M | NJ | US | 32 | Leadville Trail 100M 2023 (30 hours) |
| 116369 | Aakre | Blair | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 116292 | Abarca | Sergio | M | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 113844 | Abbott | Gabriel | M | KY | US | 2 | Indiana 100M 2023 (30 hours) |
| 114567 | ABE | MOTONORI | M | TOKYO | JP | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 114545 | Abe | Shinya | M | Kanagawa-pref. | JP | 2 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 103933 | Abel | William | M | IL | US | 256 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 109592 | Abele Plaza | Christian | M | Madrid | ES | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 111206 | Abolfathi | Maryam | F | California | US | 2 | Leona Divide 100km 2023 (16 hours) |
| 118414 | Abreu | Emily | F | OR | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 108118 | Abriola | Jim | M | Pa | US | 4 | Rim to River 100M 2023 (32 hours) |
| 104555 | Acer | Mike | M | PA | US | 4 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 116583 | Acha | Alejandro Javier | M | Distrito Federal | AR | 1 | Patagonia 112km 2023 (27 hours) |
| 116043 | Achey | Donald | M | Ohio | US | 1 | Mohican 100M 2023 (32 hours) |
| 115239 | Ackerley | Joe | M | England | GB | 1 | North Downs Way 100M 2023 (30 hours) |
| 116852 | Ackermann | Nicholas | M | TX | US | 1 | High Lonesome 100M 2023 (37 hours) |
| 115831 | Acosta | Carly | F | ID | US | 1 | Beaverhead 100km 2023 (20 hours) |
| 107551 | Adam | Eric | M | Vienna | AT | 2 | Grossglockner UltraTrail 110km 2023 (28 hours) |
| 109221 | adame | michael | M | California | US | 4 | Canyons by UTMB 100km 2023 (18 hours) |
| 118661 | Adamo | Ellen | F | MO | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 105259 | Adams | Amy | F | MD | US | 16 | Massanutten 100M 2023 (36 hours) |
| 103721 | Adams | Chas | M | OH | US | 16 | Black Canyon 100km 2023 (17 hours) |
| 106056 | Adams | Chris | M | GBR | GB | 8 | Race to the Stones 100km 2023 (17 hours) |
| 110102 | Adams | David | M | CA | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 114775 | Adams | David | M | Scotland | GB | 1 | West Highland Way 95M 2023 (30 hours) |
| 104443 | Adams | Drew | M | ID | US | 8 | IMTUF 100M 2023 (36 hours) |
| 118204 | Adams | Gregory | M | Georgia | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 105692 | Adams | Holly | F | GA | US | 16 | Black Canyon 100km 2023 (17 hours) |
| 117813 | Adams | Isaac | M | OK | US | 1 | Canyons by UTMB 100M 2023 (32 hours) |
| 107767 | Adams | Jared | M | NSW | AU | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 100729 | Adams | Jeffrey | M | NY | US | 64 | Run Rabbit Run 100M 2023 (36 hours) |
| 112469 | Adams | John | M | Newfoundland | CA | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115441 | Adams | Joseph | M | Pennsylvania | US | 1 | Worlds End 100km 2023 (19 hours) |
| 115448 | ADAMS | JUSTIN | M | WA | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 118112 | Adams | Lorna | F | Buckinghamshire | US | 1 | Race to the Stones 100km 2023 (17 hours) |
| 118278 | Adams | Taylor | M | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 115254 | Adams | Zane | M | Auckland | NZ | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 108763 | Addams | Lee | M | NE | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 118175 | Addante | Rocco | M | California | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 103843 | Addison | Julia | F | CA | US | 16 | Black Canyon 100km 2023 (17 hours) |
| 115716 | ADE | GRÉGORY | M | Hauts de Seine | FR | 1 | Transgrancanaria 125km 2023 (28 hours) |
| 112706 | Adkins | Jeremy | M | Michigan | US | 2 | Burning River 100M 2023 (30 hours) |
| 113513 | Adkins | Phillip | M | MI | US | 2 | Canyons by UTMB 100M 2023 (32 hours) |
| 107411 | Adler | Brent | M | Oregon | US | 16 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 113335 | Adlong | Daniel | M | California | US | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 118968 | Adzmi | Aqmal | M | Pahang | MY | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 114822 | Affentranger | Michael | M | OK | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 103123 | Affleck | Nick | M | CA | US | 4 | Never Summer 103km 2023 (23 hours) |
| 112068 | Afonso | Carlos | M | Santa Cruz de Tenerife | ES | 2 | Ultra Trail Bosques del Sur 106km 2023 (22 hours) |
| 100335 | Agmon | Tal | M | ISR | IL | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 116287 | Agnew | Brian | M | WI | US | 1 | Hennepin 100M 2023 (30 hours) |
| 115312 | Agnew | Darren | M | High peak | GB | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116032 | Agojo | Peaches | F | CA | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 103299 | Aguayo | David | M | CA | US | 2 | Cocodona 250M 2023 (125 hours) |
| 118444 | Aguayo | Eric | M | Pichincha | EC | 1 | Puerto Vallarta México by UTMB 100km 2023 (18 hours) |
| 117547 | Agugiaro | Mattia | M | Padova | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 109397 | Aguielra Carrasco | Rafael Fernando | M | huelva | ES | 2 | Ultra Trail Sierras del Bandolero 166km 2023 (40 hours) |
| 115980 | Aguilar | Dilcia | F | Francisco Morazan | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 109948 | Aguilar | Paulo | M | CA | US | 2 | Cuyamaca 100km 2023 (17 hours) |
| 117673 | Aguilera | Jorge | M | IN | US | 1 | Indiana 100M 2023 (30 hours) |
| 117317 | Aguirre | Stephan | M | CO | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 118782 | Agullo | Gregory | M | Victoria | AU | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 114161 | Agulov | Egor | M | CA | US | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 118179 | Ahier | Melissa | F | Québec | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 118210 | Ahlgren | Travis | M | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 118491 | Ahonen | Mikko | M | Uusimaa | FI | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 111330 | Ahuja | Sonia | F | California | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 116703 | Aidala | Michael | M | CO | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 114852 | Aiello | Gregorio | M | Italy | IT | 1 | Swiss Alps 100km 2023 (22 hours) |
| 119032 | Aikens | Brian | M | PA | US | 1 | Eastern States 100M 2023 (36 hours) |
| 118091 | Aikman | Erica | F | MI | US | 1 | Hennepin 100M 2023 (30 hours) |
| 108860 | Ainge | Timothy | M | British Columbia | CA | 4 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 107220 | Ainley | Simon | M | Surrey | GB | 4 | Race to the Stones 100km 2023 (17 hours) |
| 119004 | Ainsley | Polly | F | Bristol | GB | 1 | Race to the Stones 100km 2023 (17 hours) |
| 116554 | ainsworth | david | M | Texas | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 118305 | Airault | Ferdinand | M | New York | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 115240 | Aitelhocine | Fabrice | M | Ile De France | FR | 1 | Restonica Trail by UTMB - Ultra-Trail® di Corsica 110km 2023 (36 hours) |
| 119093 | AITOR | CASASEMPERE | M | BIZKAIA | ES | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 117700 | Aizawa | Akimichi | M | kiryu Gumma | JP | 1 | Transjeju International Trail Run 112km 2023 (27 hours) |
| 105261 | Aizawa | Yuuki | M | JPN | JP | 4 | FunTrails Chichibu & Okumusashi 105km 2022 (30 hours) |
| 112414 | Aja Fresnedo | Alejandro | M | Pue. | MX | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 111424 | AKAISHI | MITSUYASU | M | saitama-pref | JP | 2 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 100350 | Akins | Joshua | M | NY | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 117210 | AKIRA | Shinya | M | Tokyo | JP | 1 | FunTrails Chichibu & Okumusashi 105km 2022 (30 hours) |
| 113594 | Akley | Nicholas | M | CO | US | 2 | Never Summer 103km 2023 (23 hours) |
| 114911 | Akram | Benfredj | M | Bordj bou arreridj | DZ | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 113717 | Akrigg | Roderick | M | AB | CA | 2 | Fat Dog 120M 2023 (48 hours) |
| 114023 | Al Thani | Abdulla | M | DOHA | QA | 2 | Race to the Stones 100km 2023 (17 hours) |
| 107509 | Albanese | Richard | M | IL | US | 4 | Tunnel Hill 100M 2022 (30 hours) |
| 117979 | Alber | Dan | M | Mi | US | 1 | Indiana 100M 2023 (30 hours) |
| 114941 | Alberdi | Koldo | M | Navarra | ES | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118944 | Albert | Alissa | F | CA | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 102963 | Albert | Dan | M | TN | US | 16 | Gorge Waterfalls 100km 2023 (17 hours) |
| 107760 | Albert | Jacob | M | IL | US | 2 | Burning River 100M 2023 (30 hours) |
| 105222 | Albert | Jeff | M | CO | US | 16 | Run Rabbit Run 100M 2023 (36 hours) |
| 110073 | Albert | Marla | F | Tennessee | US | 4 | Grindstone 100km 2023 (18 hours) |
| 111580 | Alberts | Michael | M | Florida | US | 2 | Georgia Death Race 74M 2023 (23 hours) |
| 115195 | Alcock | Jensen | M | Canterbury | NZ | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 108737 | Aldaz | Kylie | F | AZ | US | 4 | Gorge Waterfalls 100km 2023 (17 hours) |
| 104920 | Aldous | Jay | M | CHE | CH | 8 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 118567 | Aldridge | John | M | West Sussex | GB | 1 | South Downs Way 100M 2023 (30 hours) |
| 106536 | Alevisos | Georg | M | GRC | GR | 16 | Soria Moria til Verden Ende 100M 2023 (35 hours) |
| 112521 | Alexander | Bonnie | F | NC | US | 2 | Canal Corridor 100 100M 2023 (30 hours) |
| 100438 | Alexander | Jesse | M | AZ | US | 64 | Bear, The 100M 2023 (36 hours) |
| 111321 | Alfaro | Manuel | M | Flores | CR | 1 | Grindstone 100km 2023 (18 hours) |
| 118534 | Alford | Tim | M | Worcester | GB | 1 | Race to the Stones 100km 2023 (17 hours) |
| 101084 | Alimonos | Costa | M | OH | US | 4 | Never Summer 103km 2023 (23 hours) |
| 102141 | Allamon | David | M | AZ | US | 64 | San Diego 100M 2023 (32 hours) |
| 116005 | Alleguen | Claire | F | Hove | GB | 1 | South Downs Way 100M 2023 (30 hours) |
| 102585 | Allen | Brandon | M | AR | US | 4 | Arkansas Traveler 100M 2023 (30 hours) |
| 107522 | Allen | Chad | M | Wa | US | 4 | Wasatch Front 100M 2023 (36 hours) |
| 116536 | Allen | Christopher | M | Oxfordshire | US | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 112287 | Allen | James | M | Manchester | GB | 2 | Dalmacija Ultra Trail 122km 2023 (32 hours) |
| 102539 | Allen | Jeff | M | SC | US | 64 | Grindstone 100M 2023 (38 hours) |
| 111903 | Allen | Jennifer | F | MT | US | 2 | Crazy Mountain 100M 2023 (36 hours) |
| 114711 | Allen | Joe | M | UT | US | 1 | Zion 100M 2023 (36 hours) |
| 118142 | allen | missy | F | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 110500 | Allen | Nick | M | California | US | 4 | Canyons by UTMB 100km 2023 (18 hours) |
| 116823 | Allen | Sanna | F | South Karelia Region | FI | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 117737 | Allen | Scott | M | WI | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 118483 | Allen | Stephanie | F | New Mexico | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 117629 | Alli | Ahmad | M | Ontario | CA | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116407 | Allison | Lindsay | F | CO | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 112139 | Allman | Teresa | F | Hi | US | 2 | Miwok 100km 2023 (15.5 hours) |
| 109204 | Allnutt | Daniel | M | Ohio | US | 2 | Mohican 100M 2023 (32 hours) |
| 109634 | Allnutt | William | M | OH | US | 4 | Mohican 100M 2023 (32 hours) |
| 104727 | Allom | Craig | M | AUS | AU | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 117540 | Almond | Christine | F | BC | CA | 1 | Fat Dog 120M 2023 (48 hours) |
| 115498 | Alquier | Magali | F | Occitanie | FR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 100396 | Alsip | Jonathan | M | MI | US | 8 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 105012 | Alsop | Jeremy | M | NC | US | 4 | Hellgate 100km 2022 (17 hours) |
| 114954 | Alta | Eric | M | WI | US | 1 | Bear, The 100M 2023 (36 hours) |
| 117126 | Altamore | Tim | M | Victoria | US | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 103140 | Altemos | Erin | M | MD | US | 4 | Massanutten 100M 2023 (36 hours) |
| 100497 | Altendahl | Joseph | M | MN | US | 64 | Superior 100 100M 2023 (38 hours) |
| 113886 | Alter | James | M | TN | US | 2 | No Business 100M 2023 (33.5 hours) |
| 107663 | Alton | Connor | M | Utah | US | 4 | Wasatch Front 100M 2023 (36 hours) |
| 112241 | Alvarez | Fernando | M | Parma | IT | 2 | Julian Alps Trail Run by UTMB 170km 2023 (46 hours) |
| 116134 | Alvarez | Isabel | F | CA | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 117437 | Alvarez Vergara | Manuel | M | Jalisco | MX | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 107149 | Alverson | Brandon | M | Florida | US | 2 | Pinhoti 100M 2023 (31 hours) |
| 117092 | ALVEZ BARRERO | FERNANDO | M | BADAJOZ | ES | 1 | Ultra Trail Sierras del Bandolero 166km 2023 (40 hours) |
| 117948 | Alzayer | Hadi | M | Eastern Province | SA | 1 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 117434 | Amarasinghe | Barushi | M | Colombo | LK | 1 | Massanutten 100M 2023 (36 hours) |
| 117866 | Amato | Anthony | M | New Jersey | US | 1 | Grindstone 100km 2023 (18 hours) |
| 101186 | Amato | Josh | M | MO | US | 32 | Sean O'Brien 100km 2023 (16 hours) |
| 117635 | Ambler | Ben | M | Tx | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 113213 | Ambrose | Anton | M | Hampshire | GB | 2 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 112173 | Ambrose | Michael | M | Utah | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 114882 | Ambrosini | Davide | M | Italy | IT | 1 | Morenic Trail 100km 2023 (22 hours) |
| 118073 | Amdahl | Mark | M | VA | US | 1 | Grindstone 100km 2023 (18 hours) |
| 111292 | Aminzade | Daniel | M | CA | US | 2 | Quicksilver 100km 2023 (17 hours) |
| 113724 | Amir | Nir | M | Israel | IL | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 101653 | Amital | Chuck | M | CA | US | 16 | Quicksilver 100km 2023 (17 hours) |
| 101969 | Amlung | Jonathon | M | KY | US | 1 | Western States 100M 2023 (30 hours) |
| 116168 | Ammann | Davis | M | WA | US | 1 | Cascade Crest 100M 2023 (35 hours) |
| 103619 | Amneskog | Tomas | M | SWE | SE | 1 | Western States 100M 2023 (30 hours) |
| 117229 | Amo | wayne | M | ca | US | 1 | Zion 100M 2023 (36 hours) |
| 117242 | Amonette | Matthew | M | Virginia | US | 1 | Grindstone 100M 2023 (38 hours) |
| 115557 | Amoore | Travers | M | Auckland | NZ | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 117265 | Amyotte | Colin | M | Alberta | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 115679 | Anderini | Amos | M | Italy | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 114925 | Anders | Jette | F | Hessen | DE | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 116218 | Andersen | Daniel | M | Aarhus | DK | 1 | Zugspitz 111km 2023 (25 hours) |
| 108706 | Anderson | Alan | M | Essex | GB | 4 | Lakeland 100M 2023 (40 hours) |
| 118597 | Anderson | Cecilia | F | WA | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 107592 | Anderson | Chris | M | Minnesota | US | 2 | Hennepin 100M 2023 (30 hours) |
| 100042 | Anderson | Colin J | M | GBR | GB | 8 | Lakeland 100M 2023 (40 hours) |
| 115811 | Anderson | Corrine | F | MN | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 115944 | Anderson | Craig | M | NM | US | 1 | Waldo 100km 2023 (18 hours) |
| 109190 | Anderson | Dana | M | MI | US | 4 | Mohican 100M 2023 (32 hours) |
| 118925 | Anderson | Daniel | M | OK | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 105738 | Anderson | Eric | M | NC | US | 16 | Hellgate 100km 2022 (17 hours) |
| 103430 | Anderson | Jake | M | UT | US | 4 | Bear, The 100M 2023 (36 hours) |
| 113277 | Anderson | James | M | AZ | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 106679 | Anderson | Janice | F | GA | US | 8 | Canal Corridor 100 100M 2023 (30 hours) |
| 104482 | Anderson | John | M | CA | US | 4 | Zion 100km 2023 (19 hours) |
| 112822 | Anderson | Jonathan | M | CA | US | 2 | Leona Divide 100km 2023 (16 hours) |
| 116533 | Anderson | Joseph | M | Tennessee | US | 1 | No Business 100M 2023 (33.5 hours) |
| 104233 | Anderson | Katy | F | NSW | AU | 2 | Leadville Trail 100M 2023 (30 hours) |
| 105033 | Anderson | Kayde | F | CO | US | 4 | Never Summer 103km 2023 (23 hours) |
| 107445 | Anderson | Matt | M | Hampshire | GB | 4 | Lakeland 100M 2023 (40 hours) |
| 100632 | Anderson | Mica | F | AL | US | 2 | Yeti (Virginia) 100M 2023 (30 hours) |
| 109724 | Anderson | Mike | M | KY | US | 4 | Burning River 100M 2023 (30 hours) |
| 117066 | Anderson | Nathaniel | M | CO | US | 1 | High Lonesome 100M 2023 (37 hours) |
| 115788 | Anderson | Peter | M | MN | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 118901 | Anderson | Ryan | M | WA | US | 1 | Cascade Crest 100M 2023 (35 hours) |
| 107649 | Anderson | Spencer | M | Oregon | US | 4 | Siskiyou Outback 100km 2023 (17 hours) |
| 115159 | Anderson | Tom | M | Qld | AU | 1 | Blackall 100K 100km 2023 (18 hours) |
| 113840 | Andersson | Anna | F | Skåne | SE | 2 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 102574 | Andersson | Jonas | M | SWE | SE | 2 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 105115 | Andersson | Oscar | M | SWE | SE | 16 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 113862 | Andersson | Oscar | M | Stockholm | SE | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 113202 | Andersson | Pal | M | Skåne | SE | 2 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 112457 | Andersson | Sebastian | M | Sverige | SE | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 106681 | Andersson | Steven | M | Minnesota | US | 1 | Western States 100M 2023 (30 hours) |
| 117912 | Andersson | Tobias | M | California | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 115543 | Andreani | Simone | M | Perugia | IT | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 111263 | Andreas | Justin | M | Alaska | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 119015 | Andres | Kyle | M | UT | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 105502 | Andrews | Bobby | M | WA | US | 32 | HURT 100M 2023 (36 hours) |
| 108715 | Andrews | Chris | M | CA | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 103636 | Andrews | Glen | M | AUS | AU | 2 | Kosciusko by UTMB 100M 2022 (36 hours) |
| 114872 | Andrzejewski | Karl | M | Texas | US | 1 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 100176 | Ang | Alex | M | SGP | SG | 16 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 102881 | Angara | Ric | M | IL | US | 64 | Mohican 100M 2023 (32 hours) |
| 117430 | Angel | Diana | F | IL | US | 1 | Mohican 100M 2023 (32 hours) |
| 114693 | Angell | Nick | M | OR | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 109857 | Angell | Rich | M | OH | US | 4 | Laurel Highlands 70.5M 2023 (20 hours) |
| 112081 | Angerer | Karen | F | MO | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 118744 | Anglin | Ashley | F | IN | US | 1 | Indiana 100M 2023 (30 hours) |
| 111353 | Angwin | Marcus | M | Victoria | AU | 2 | Guzzler Ultra 100km 2023 (24 hours) |
| 117771 | Antal | Zoltan | M | Hungary | HU | 1 | Istria by UTMB 110km 2023 (24 hours) |
| 118960 | Antila | Johanna | F | Vaasa | FI | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 116804 | Antonisse | Drew | M | CO | US | 1 | Hellgate 100km 2022 (17 hours) |
| 104480 | Aoyama | Tatsuro | M | JPN | JP | 64 | Transjeju International Trail Run 112km 2023 (27 hours) |
| 116923 | Apicella | Nicholas | M | AR | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 104340 | Aponte | Sarah | F | MA | US | 16 | Twisted Branch 100km 2023 (20 hours) |
| 108179 | Aquilano | Shea | F | IN | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 102857 | Arauzo | Megan | F | CA | US | 32 | Beaverhead 100km 2023 (20 hours) |
| 115236 | Araya | Takuya | M | HYOGO | JP | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 100956 | Arbinger | Kimberly | F | WI | US | 8 | Twisted Branch 100km 2023 (20 hours) |
| 116751 | Arbogast | Lee | M | Pa | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 117047 | Arcadia | Shane | M | WA | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 101848 | Arce | Patrick | M | FRA | FR | 8 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115726 | Archer | Shannon | M | AR | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 107180 | Ard | Mike | M | MT | US | 4 | Crazy Mountain 100M 2023 (36 hours) |
| 116792 | Ardanowski | Nathan | M | VA | US | 1 | Grindstone 100km 2023 (18 hours) |
| 117579 | Arend | Rob | M | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 103449 | Arguello | Adam | M | NM | US | 64 | Fat Dog 120M 2023 (48 hours) |
| 116809 | Arias | Araceli | F | Mexico | MX | 1 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 113600 | Arias Fos | Xavier | M | Spain | ES | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 100337 | Arias Massa | Marcelo | M | CHL | CL | 32 | Vulcano Ultra Trail 100km 2022 (24 hours) |
| 108491 | Arias Resco | Jorge | M | Madrid | ES | 4 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 117528 | Arima | Hiroyasu | N | Kanagawa | JP | 1 | Shinetsu Five Mountains Trail 100M 2023 (33 hours) |
| 111372 | Arimura | Takeshi | M | Kanagawa | JP | 2 | Shinetsu Five Mountains Trail 100M 2023 (33 hours) |
| 110378 | Armbrust | John | M | TX | US | 4 | HOKA Bandera 100km 2023 (17 hours) |
| 117569 | armenini | gina | F | PA | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 100674 | Armistead | Peter | M | GBR | GB | 4 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 115754 | Armitage | Patrick | M | CA | US | 1 | Sean O'Brien 100km 2023 (16 hours) |
| 115862 | Armstrong | Catherine | F | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 108192 | Armstrong | Denver | M | Ca | US | 1 | Western States 100M 2023 (30 hours) |
| 101433 | Armstrong | Jordan | F | UT | US | 4 | Wasatch Front 100M 2023 (36 hours) |
| 110824 | Arndt | Tiemo | M | Saxony | DE | 2 | Zugspitz 111km 2023 (25 hours) |
| 115931 | Arneson | Mathew | M | WI | US | 1 | Beaverhead 100km 2023 (20 hours) |
| 104784 | Arnold | Daniel | M | AR | US | 32 | Arkansas Traveler 100M 2023 (30 hours) |
| 108872 | Arnold | Jim | M | IL | US | 4 | Hennepin 100M 2023 (30 hours) |
| 102591 | Arnold | Todd | M | PA | US | 16 | Burning River 100M 2023 (30 hours) |
| 115755 | Arnzen | Jenny | F | ID | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 117781 | Aroca | Julia | F | CO | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 116382 | Aronhalt | Gary | M | Colorado | US | 1 | No Business 100M 2023 (33.5 hours) |
| 112059 | Aronson | Ty | M | FL | US | 2 | Long Haul 100M 2023 (30 hours) |
| 118069 | Arreola | Alejandro | M | Washington | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 115989 | Arriagada | Hector | M | Región Metropolitana | CL | 1 | Vulcano Ultra Trail 100km 2022 (24 hours) |
| 118287 | Arrieta | David | M | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 102559 | Arrington | Donna | F | AL | US | 64 | No Business 100M 2023 (33.5 hours) |
| 119031 | Arrowood | Kevin | M | South Carolina | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 114606 | Arthur | Mike | M | ON | CA | 2 | Indiana 100M 2023 (30 hours) |
| 116104 | Arthur | Nikki | F | Douglas | IM | 1 | West Highland Way 95M 2023 (30 hours) |
| 116424 | Artman | Andrea | F | OR | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 113008 | Arvik | Therese | F | Oslo | NO | 2 | Transgrancanaria 125km 2023 (28 hours) |
| 115083 | Arzenton | Ivo | M | Veneto | IT | 1 | Ultra Trail Lago d'Orta 102km 2023 (24 hours) |
| 112967 | ASAI | MINAKO | F | TOKYO | JP | 2 | Shinetsu Five Mountains Trail 100M 2023 (33 hours) |
| 119045 | Ashcroft | Chris | M | NSW | AU | 1 | Kosciusko by UTMB 100km 2022 (18 hours) |
| 111294 | Ashley | Craig | M | Washington | US | 2 | Gorge Waterfalls 100km 2023 (17 hours) |
| 112784 | Ashton | Rohan | M | Nsw | AU | 2 | Surf Coast Century 100km 2023 (16 hours) |
| 112244 | Askew | Darla | F | OR | US | 2 | Hardrock 100M 2023 (48 hours) |
| 113620 | Askey | Nick | M | TX | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 101090 | Asmus | Michael | M | MN | US | 16 | Bighorn 100M 2023 (35 hours) |
| 119036 | Asseer | Rudi | M | ON | CA | 1 | Canyons by UTMB 100M 2023 (32 hours) |
| 109424 | Assen | Lars | M | Overijssel | NL | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 107923 | Astle | Leslie | F | CA | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 118651 | Atchison | Kenneth | M | Alabama | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 101971 | Atha | Chris | M | CA | US | 4 | Zion 100km 2023 (19 hours) |
| 114892 | Atherton | Sam | M | TN | US | 1 | Eastern States 100M 2023 (36 hours) |
| 100698 | Atkins | Benjamin | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 116503 | Atkins | Max | M | Pennsylvania | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 110067 | Atkinson | Chris | M | Waikato | NZ | 4 | Tarawera 100M 100M 2023 (36 hours) |
| 101711 | Atkinson | Jeremiah | M | PA | US | 8 | Javelina Jundred 100M 2023 (30 hours) |
| 107796 | Atkinson | Karin | F | Texas | US | 4 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 108836 | Atkinson | Patrick | M | Delaware | US | 4 | Cocodona 250M 2023 (125 hours) |
| 117704 | Atkinson | Thomas | M | Lancashire | GB | 1 | Race to the Stones 100km 2023 (17 hours) |
| 105443 | Atsumi | Yuka | F | JPN | JP | 8 | Oregon Cascades 100M 2023 (32:01:18) |
| 109386 | Attali | Pierre | U | Murcia | ES | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 114067 | Atterberry | Emory | M | Texas | US | 2 | High Lonesome 100M 2023 (37 hours) |
| 102920 | Atwater | Ty | M | MT | US | 2 | Waldo 100km 2023 (18 hours) |
| 118710 | Au | John | M | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 116233 | Auble | Andy | M | Montana | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 106427 | Aubrey | Christopher | M | AB | CA | 32 | Tahoe 200 202M 2023 (100 hours) |
| 100192 | Auch | Steve | M | DEU | DE | 32 | Zugspitz 111km 2023 (25 hours) |
| 109006 | Audette | Guillaume | M | Quebec | CA | 4 | Grindstone 100km 2023 (18 hours) |
| 115081 | Augusto Santos | Daniel | M | Viseu | PT | 1 | EstrelAçor Trail Ultra Endurance 100km 2023 (24 hours) |
| 105026 | Aumayr | Paul | M | MD | US | 2 | Yeti (Virginia) 100M 2023 (30 hours) |
| 111363 | Aurensanz | Alberto | M | Zaragoza | ES | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 118035 | Auroy | Richard | M | France | US | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 116897 | Aussieker | Michael | M | Tx | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 110956 | Auston | Stephanie | F | NSW | AU | 1 | Western States 100M 2023 (30 hours) |
| 105569 | Auth | Kimberly | F | PA | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 114674 | Autin | Chip | M | Louisiana | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 115750 | Avdeeva | Kseniia | F | Krasnoyarskiy krai | RU | 1 | Salomon Cappadocia Ultra-Trail 119km 2023 (23 hours) |
| 117275 | Avellaneda Delgado | Miguel | M | Baleares | ES | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 114021 | Aviles martinez | Pedro | M | Ca | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 107776 | Avontuur | Antonius | M | Zuid Holland | NL | 4 | Grand Trail des Lacs et Châteaux 165km 2023 (40 hours) |
| 112187 | Awrey | Robert | M | OH | US | 2 | Worlds End 100km 2023 (19 hours) |
| 117552 | Axelle | Nardoux | F | Haute Savoie | FR | 1 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 116651 | Axsom | Kalo | M | FL | US | 1 | Long Haul 100M 2023 (30 hours) |
| 116488 | AYERS | EVAN | M | Utah | US | 1 | Zion 100km 2023 (19 hours) |
| 118603 | AYING | SEAN JOHN | M | DAVAO | PH | 1 | Vietnam Mountain Marathon 100km 2023 (27 hours) |
| 116392 | Aylward | Peter | M | Dublin | IE | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 118315 | Ayres | James | M | TX | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 115505 | Azar | Christopher | M | NY | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 109220 | AZMI | NAAMAN | M | ISRAEL | IL | 4 | Ultra Trail Vipava Valley 170km 2023 (46 hours) |
| 113564 | Azumi | Konoka | F | Nelson | NZ | 2 | Tarawera 100K 102km 2023 (17 hours) |
| 115976 | Baader-Lips | Brenda | F | FL | US | 1 | Long Haul 100M 2023 (30 hours) |
| 117058 | Baars | Anouk | F | Haute Savoie | FR | 1 | Trail Alsace Grand Est by UTMB - Ultra-Trail des Chevaliers 173km 2023 (40 hours) |
| 112790 | Baatar | Zagdaa | F | California | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 107629 | Bååth | Daniel | M | Malmo | SE | 4 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 107839 | Babb | Michael | M | co | US | 4 | HOKA Bandera 100km 2023 (17 hours) |
| 115575 | Babini | Augusto | M | Mendoza | AR | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 113385 | Babiolakis | Yianni | M | Florida | US | 2 | Long Haul 100M 2023 (30 hours) |
| 118421 | BABIS | PIOTR | M | TAS | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 117951 | bachelet | martin | M | Neuchatel | CH | 1 | SwissPeaks 100km 2023 (28 hours) |
| 106683 | Bachman | Tod | M | 1 | Western States 100M 2023 (30 hours) | ||
| 104242 | Backhausen | Majell | M | VIC | AU | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 108535 | Bacon | Jonathan | M | Zurich | CH | 4 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 103387 | Bacon | William | M | CA | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 109084 | Bacwaden | Byrne | M | Mountain Province | PH | 4 | Massanutten 100M 2023 (36 hours) |
| 117789 | Badenhop | Charlene | F | OH | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 115949 | Badger | Chantal | F | AB | CA | 1 | Quebec Mega Trail 110km 2023 (22 hours) |
| 102851 | Baer | Katherine | F | NC | US | 16 | No Business 100M 2023 (33.5 hours) |
| 115846 | Baertlein | Mitch | M | OR | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 105279 | Baetz | James | M | WI | US | 8 | Kettle Moraine 100M 2023 (30 hours) |
| 116226 | Baeza | Carlos | M | Chihuahua | MX | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 108101 | Bagrin | Adrian | M | California | US | 4 | San Diego 100M 2023 (32 hours) |
| 114248 | Bagwell | Travis | M | Texas | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 116780 | Bahrey | Stephanie | F | OH | US | 1 | No Business 100M 2023 (33.5 hours) |
| 117634 | Bailey | Allie | F | Yorkshire | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 111732 | Bailey | April | F | NC | US | 2 | Yeti (Virginia) 100M 2023 (30 hours) |
| 102731 | Bailey | Chad | M | TX | US | 16 | Bear, The 100M 2023 (36 hours) |
| 101083 | Bailey | Jack | M | MA | US | 4 | Grindstone 100M 2023 (38 hours) |
| 108004 | Bain | Andrew | M | Ny | US | 4 | Twisted Branch 100km 2023 (20 hours) |
| 103807 | Bain | Chris | M | TN | US | 4 | No Business 100M 2023 (33.5 hours) |
| 102319 | Bain | Mark | M | OH | US | 2 | Mohican 100M 2023 (32 hours) |
| 103311 | Bainbridge | Andrew | M | CO | US | 1 | Western States 100M 2023 (30 hours) |
| 108514 | Baine | Trevor | M | DC | US | 4 | Massanutten 100M 2023 (36 hours) |
| 110005 | Baines | Paul | M | California | US | 4 | Rio Del Lago 100M 2023 (30 hours) |
| 111718 | Baird | Matthew | M | PA | US | 2 | Canal Corridor 100 100M 2023 (30 hours) |
| 114190 | Baird-Murray | David Justin | M | Powys | GB | 2 | South Downs Way 100M 2023 (30 hours) |
| 116153 | Bakalar | Scott | M | OH | US | 1 | Mohican 100M 2023 (32 hours) |
| 100995 | Baker | Adam | M | MD | US | 8 | Yeti (Virginia) 100M 2023 (30 hours) |
| 115299 | Baker | Buck | M | TX | US | 1 | Bighorn 100M 2023 (35 hours) |
| 108885 | baker | christy | F | CA | US | 4 | HURT 100M 2023 (36 hours) |
| 115174 | Baker | Derrick | M | MS | US | 1 | No Business 100M 2023 (33.5 hours) |
| 115887 | Baker | Graham | N | East Sussex | GB | 1 | South Downs Way 100M 2023 (30 hours) |
| 116133 | Baker | Heather | F | UT | US | 1 | Hennepin 100M 2023 (30 hours) |
| 117608 | Baker | Jason | M | MA | US | 1 | Never Summer 103km 2023 (23 hours) |
| 102638 | Baker | Jessica | F | NC | US | 32 | Indiana 100M 2023 (30 hours) |
| 103099 | Baker | Josh | M | Louisiana | US | 16 | Brazos Bend 100M 2022 (30 hours) |
| 102135 | Baker | Loren | M | CA | US | 32 | Canyons by UTMB 100M 2023 (32 hours) |
| 115070 | Baker | Mark | M | Auckland | NZ | 1 | Taupo 100k 100km 2023 (17 hours) |
| 116173 | Baker | Michael | M | NY | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 110443 | Baker | Michael | M | KZN | ZA | 1 | Ultra-Trail Cape Town 100M 2022 (45 hours) |
| 118915 | Baker | Michael | M | Queensland | AU | 1 | Blackall 100K 100km 2023 (18 hours) |
| 110731 | Baker | Michelle | F | TX | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 111620 | Baker | Ryan | M | Colorado | US | 2 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 117249 | Baker | Skyler | M | TN | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 115613 | Baker | Spencer | M | OH | US | 1 | Mohican 100M 2023 (32 hours) |
| 118225 | Baker | Stephen | M | Victoria | AU | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 102133 | Baker | Steve | M | AB | CA | 8 | Canadian Death Race 125km 2023 (24 hours) |
| 117363 | Baker | Travis | M | North Carolina | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 115763 | Baker | Wesley | M | KS | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 104191 | Bakker | Laura | F | GBR | GB | 4 | Hardwolds 80M 2022 (24 hours) |
| 115686 | Bako | Barnabas | M | Pest | HU | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 117520 | Bakouline | Boris | M | VIC | AU | 1 | Surf Coast Century 100km 2023 (16 hours) |
| 115687 | Balanescu | Valentin Catalin | M | Giurgiu | RO | 1 | Istria by UTMB 110km 2023 (24 hours) |
| 117920 | balanon | synya | M | ca | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 116696 | Baldinger | Michael | M | IL | US | 1 | Hennepin 100M 2023 (30 hours) |
| 115877 | Baldwin | Craig | M | Louisiana | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 106687 | Baldwin | John | M | 16 | Rim to River 100M 2023 (32 hours) | ||
| 114470 | Baldwin | Matthew | M | KY | US | 2 | No Business 100M 2023 (33.5 hours) |
| 113303 | Balester | Ben | M | California | US | 2 | Arkansas Traveler 100M 2023 (30 hours) |
| 108823 | Balestrieri | Daniel | M | MA | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 115593 | Balkanski | Eric | M | New York | US | 1 | Grindstone 100M 2023 (38 hours) |
| 107160 | Ball | Alex | M | SC | US | 2 | Grindstone 100M 2023 (38 hours) |
| 117192 | Ball | Ann | F | New York | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 115120 | Ball | Dane | M | TX | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 119113 | Ball | Joshua | M | MI | US | 1 | Long Haul 100M 2023 (30 hours) |
| 112554 | Ball | Justin | M | Oregon | US | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 110624 | Ball | Mitchell | M | New York | US | 4 | Twisted Branch 100km 2023 (20 hours) |
| 118655 | Ballard | Lee | M | Lincoln | GB | 1 | Azores Trail Run (Whalers' Great Route) 118km 2023 (26 hours) |
| 104506 | Ballard | Michele | F | TN | US | 2 | No Business 100M 2023 (33.5 hours) |
| 100622 | Balliet | Gilbert | M | PA | US | 8 | Worlds End 100km 2023 (19 hours) |
| 109686 | Balogh | Laszlo | M | CO | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 101625 | Baloun | Karel | M | CA | US | 8 | Run Rabbit Run 100M 2023 (36 hours) |
| 111723 | Balthazar | Angela | F | FL | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 105611 | Baltieri | Fabio | M | ITA | IT | 2 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 111875 | Bambrick | Rachel | F | PA | US | 2 | Cocodona 250M 2023 (125 hours) |
| 102027 | Banaszak | Nicholas | M | CA | US | 32 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 118382 | Banaszynski | Kelsey | F | CO | US | 1 | High Lonesome 100M 2023 (37 hours) |
| 106369 | Bancroft | Brett | M | AUS | AU | 8 | Tarawera 100M 100M 2023 (36 hours) |
| 118719 | Bandoro | Justin | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 103219 | Banel | Paul | M | CO | US | 16 | Black Canyon 100km 2023 (17 hours) |
| 108746 | Banerjee | Arnab | U | WA | US | 2 | Siskiyou Outback 100km 2023 (17 hours) |
| 102846 | Banh | Hoa | F | AUS | AU | 8 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 111315 | Bank | Ryan | M | California | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 114424 | Banko | Dean | M | PA | US | 1 | Laurel Highlands 70.5M 2023 (20 hours) |
| 107159 | Banks | Kenneth | M | NC | US | 2 | Yeti (Virginia) 100M 2023 (30 hours) |
| 104107 | Banks | Kevin | M | GBR | GB | 8 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 104052 | Bannwarth | Claire | F | FRA | FR | 16 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 118191 | Barajas | Daniela | F | California | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 116280 | Barber | Aaron | M | Arizona | US | 1 | Cocodona 250M 2023 (125 hours) |
| 106133 | Barber | Kelly | M | CA | US | 4 | High Lonesome 100M 2023 (37 hours) |
| 115402 | BARBOSA DA CUNHA | DOUGLAS | M | SP | BR | 1 | Brazil 135 135M 2023 (120 hours) |
| 116882 | Barchas | Denise | N | CA | US | 1 | Mountain Lakes 100M 2023 (30 hours) |
| 116605 | Bard | Frederic | M | Occitanie | FR | 1 | High Lonesome 100M 2023 (37 hours) |
| 114300 | Barden | Craig | M | ENG | GB | 2 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 107222 | Barden | Jesse | M | AZ | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 118296 | Bare | Cody | M | CO | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 115542 | Bareil | Paul | M | Quebec | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 118098 | BARELLI | marcel | M | ILE DE FRANCE | FR | 1 | Ultra Trail du Saint-Jacques by UTMB 123km 2023 (26 hours) |
| 104642 | Baret | Sylvain | M | FRA | FR | 8 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 107772 | Barford | Liam | M | Northamptonshire | GB | 4 | Thames Path 100 100M 2023 (28 hours) |
| 104449 | Barger | Luke | M | CO | US | 16 | Black Canyon 100km 2023 (17 hours) |
| 115706 | Bargo | Greg | M | FL | US | 1 | Hardrock 100M 2023 (48 hours) |
| 118347 | Bärhausen | Jendrik | M | Nord-Rhein-Westfalen | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 103932 | Barichievich | Alan | M | CA | US | 32 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 103549 | Barichievich | Caroline | F | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 100764 | Baris | Laney | F | NJ | US | 32 | Burning River 100M 2023 (30 hours) |
| 101411 | Barkan | William | M | CA | US | 8 | Waldo 100km 2023 (18 hours) |
| 101480 | Barkdull | David | M | CA | US | 8 | Bighorn 100M 2023 (35 hours) |
| 102018 | Barker | Brandon | M | CA | US | 8 | High Lonesome 100M 2023 (37 hours) |
| 102017 | Barker | Mae | F | FL | US | 64 | Indiana 100M 2023 (30 hours) |
| 112918 | Barker | Matthew | N | SC | US | 2 | Umstead 100M 2023 (30 hours) |
| 115117 | Barkero | Jake | M | CA | US | 1 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 100943 | Barnaba | Neal | M | PA | US | 2 | Eastern States 100M 2023 (36 hours) |
| 102567 | Barnard | Joe | M | KS | US | 32 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 117458 | BARNES | Chris | M | TX | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 113365 | Barnes | Geoffrey | M | New South Wales | AU | 2 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 116668 | Barnes | Lucas | M | WI | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 117825 | Barnes | Mick | M | Dorset | GB | 1 | Lakeland 100M 2023 (40 hours) |
| 101667 | Barnes | Paul | M | CA | US | 4 | Oregon Cascades 100M 2023 (32:01:18) |
| 105897 | Barnes | Russell | M | MS | US | 4 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 109179 | Barnes | Shaun | M | WI | US | 4 | Tunnel Hill 100M 2022 (30 hours) |
| 112969 | Barnes | Teresa | F | PA | US | 2 | Rim to River 100M 2023 (32 hours) |
| 114598 | Barnhart | Nina | F | Oregon | US | 2 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 116526 | Barnwell | Christopher | M | TX | US | 1 | Wasatch Front 100M 2023 (36 hours) |
| 113142 | Barr | Shawn | M | CA | US | 2 | Leona Divide 100km 2023 (16 hours) |
| 101884 | Barr | Tim | M | CO | US | 1 | Western States 100M 2023 (30 hours) |
| 117773 | Barrera | Jhon | M | Meta | CO | 1 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 104282 | Barrett | Andrew | M | FL | US | 16 | Cocodona 250M 2023 (125 hours) |
| 118750 | Barrett | Erik | M | Manitoba | CA | 1 | Lost Soul Ultra 100km 2023 (21 hours) |
| 118691 | Barrett | Jami | F | CA | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 115972 | Barrett | Kevin | M | Tennessee | US | 1 | Grindstone 100M 2023 (38 hours) |
| 112104 | Barrett | Tyler | M | Idaho | US | 2 | Georgia Death Race 74M 2023 (23 hours) |
| 102543 | Barrientos | Vincent | M | CA | US | 16 | Siskiyou Outback 100km 2023 (17 hours) |
| 111341 | Barrington | Jeffrey | M | Washington | US | 2 | HOKA Bandera 100km 2023 (17 hours) |
| 115269 | Barrington | Nicholas | M | London | GB | 1 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 116595 | Barrio | Santiago Cornelio | M | Zagreb | HR | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 119019 | Barrionuevo | Luciano | M | Córdoba | AR | 1 | Patagonia 112km 2023 (27 hours) |
| 107967 | Barry | David | M | N/A | IE | 4 | Ultra-Trail Cape Town 100km 2022 (21 hours) |
| 113460 | Barsch | Matthias | M | Bavaria | DE | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 100428 | Bartelsmeyer | Andrew | M | MO | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 116739 | Barter | Nicholas | M | West Sussex | GB | 1 | Thames Path 100 100M 2023 (28 hours) |
| 114934 | Barth | Andrew | M | WI | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 117613 | Bartholomew | Christopher | M | California | US | 1 | Doi Inthanon Thailand by UTMB 104km 2022 (30 hours) |
| 117714 | Bartholomew | Joshua | M | Victoria | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 100311 | Bartholomew | Lucy | F | AUS | AU | 2 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 106603 | Bartley | Alex | M | MN | US | 2 | Superior 100 100M 2023 (38 hours) |
| 118449 | Barton | Hannah | F | CO | US | 1 | Never Summer 103km 2023 (23 hours) |
| 113913 | Bartosik | Magdalena | F | Idaho | US | 2 | Zion 100km 2023 (19 hours) |
| 115596 | Bartosik | Wojciech | M | ID | US | 1 | Zion 100km 2023 (19 hours) |
| 119084 | Bartram | Sam | M | Staffordshire | GB | 1 | North Downs Way 100M 2023 (30 hours) |
| 116939 | Bartus | Cynthia | F | Pa | US | 1 | Worlds End 100km 2023 (19 hours) |
| 116941 | Baruch | Andre | M | NJ | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 114721 | Barushev | Denis | M | CA | US | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 116199 | Bash | Erica | F | NJ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 114495 | Basham | Amanda | F | Colorado | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 107613 | Bass | Ilya | M | MA | US | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 101680 | Bassa | Tommaso | M | ITA | IT | 32 | Tuscany Crossing 103km 2023 (21 hours) |
| 113497 | Bassett | Chris | M | California | US | 1 | Cascade Crest 100M 2023 (35 hours) |
| 101010 | Bassili | Tara | F | ON | CA | 4 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 104804 | Bastiaens | Wim | M | BEL | BE | 2 | Tor des Géants 330km 2023 (132 hours) |
| 118581 | Bastien | Julien | M | QC | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 101385 | Batchelor | Eric | M | CA | US | 2 | Gorge Waterfalls 100km 2023 (17 hours) |
| 116826 | Batdorf | Gabriel | M | PA | US | 1 | Eastern States 100M 2023 (36 hours) |
| 107630 | Bateman | Luke | M | Texas | US | 2 | Cascade Crest 100M 2023 (35 hours) |
| 119009 | Bates | Angela | F | AB | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 109327 | Bates | Becky | F | B.C. | CA | 4 | Hardrock 100M 2023 (48 hours) |
| 110654 | Bates | Daniel | M | CT | US | 4 | Beaverhead 100km 2023 (20 hours) |
| 115723 | Bates | Krista | F | VA | US | 1 | Grindstone 100km 2023 (18 hours) |
| 113239 | Bates | Matthew | M | California | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 112374 | Bates | Zachary | M | AZ | US | 1 | Western States 100M 2023 (30 hours) |
| 111567 | Bathe | Colin | M | Cornwall | GB | 2 | Lakeland 100M 2023 (40 hours) |
| 116943 | Batiste | Suzanne | F | CO | US | 1 | High Lonesome 100M 2023 (37 hours) |
| 109174 | Batistella | Cristian Gabriel | M | Cordoba | AR | 4 | Ultra Trail Amanecer Comechingón 100M 2023 (41 hours) |
| 118057 | Baud | Laurent | M | NY | US | 1 | Grindstone 100km 2023 (18 hours) |
| 109510 | Baud-Lavigne | Bertrand | M | QC | CA | 4 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 117202 | BAUDRY | GALAAD | M | Ile-de-France | FR | 1 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 115577 | Bauer | Anthony | M | MA | US | 1 | Indiana 100M 2023 (30 hours) |
| 102657 | Bauer | Becki Lynn | F | CO | US | 1 | Western States 100M 2023 (30 hours) |
| 102680 | Bauer | Beth | F | OH | US | 16 | Superior 100 100M 2023 (38 hours) |
| 111699 | Bauer | Bob | M | Pa | US | 2 | Crazy Mountain 100M 2023 (36 hours) |
| 109539 | Bauer | Brett | M | Washington | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 118548 | Bauer | Dominik | M | Saarland | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 116812 | Bauer | Ross | M | PA | US | 1 | Worlds End 100km 2023 (19 hours) |
| 102867 | Baughman | John | M | FL | US | 32 | Long Haul 100M 2023 (30 hours) |
| 113299 | Baughman | Mary | F | Colorado | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 102376 | Baum | Andrew | M | UT | US | 8 | Sean O'Brien 100km 2023 (16 hours) |
| 109603 | Baum | Jason | M | AZ | US | 2 | Cocodona 250M 2023 (125 hours) |
| 104079 | Baumann | Jonathon | M | IN | US | 32 | No Business 100M 2023 (33.5 hours) |
| 116366 | Baumer | Chris | M | PA | US | 1 | Grindstone 100km 2023 (18 hours) |
| 109392 | Baumgartner | Stephen | M | TX | US | 4 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 117770 | Baumhover | James | M | CO | US | 1 | Never Summer 103km 2023 (23 hours) |
| 117760 | Bavier | Miranda | F | TN | US | 1 | Zion 100M 2023 (36 hours) |
| 103386 | Baxley | Dan | M | CA | US | 64 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 110972 | Baxley | Danna | F | KY | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 116632 | Baxley | Paul | M | Idaho | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 118056 | Baxter | Aaron | M | SA | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 118289 | Baxter | Dean | M | NSW | AU | 1 | Kosciusko by UTMB 100M 2022 (36 hours) |
| 112373 | Bay | Andy | M | OH | US | 2 | No Business 100M 2023 (33.5 hours) |
| 115292 | Bayliss | Trent | M | NSW | AU | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 118000 | Bayush | Tori | F | ALABAMA | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 118676 | Beachy | Kyle | M | Ohio | US | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 119024 | Beal | Brandon | M | Ohio | US | 1 | Hennepin 100M 2023 (30 hours) |
| 118131 | Beal | Brian | M | Nc | US | 1 | Rim to River 100M 2023 (32 hours) |
| 111415 | Beall | Lee | U | GA | US | 2 | Georgia Death Race 74M 2023 (23 hours) |
| 118991 | Bean | Rob | M | NH | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 100844 | Beard | Marcy | F | TX | US | 256 | Bighorn 100M 2023 (35 hours) |
| 104524 | Bearss | Joseph | M | CO | US | 4 | Indiana 100M 2023 (30 hours) |
| 104598 | Beatty | Croom | M | CA | US | 16 | Miwok 100km 2023 (15.5 hours) |
| 113880 | Beatty | Todd | M | SC | US | 2 | Grindstone 100M 2023 (38 hours) |
| 114564 | Beauchamp | Heidi | F | CO | US | 2 | High Lonesome 100M 2023 (37 hours) |
| 115102 | Beaudry | Justin | M | Arizona | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 115735 | Beaudway | David | M | Colorado | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 116001 | Beaulieu | Jordan | M | Alberta | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 117451 | Beaver | Laura | F | TX | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 116891 | Beaver | Sandra | F | CA | US | 1 | Hennepin 100M 2023 (30 hours) |
| 111318 | Beavers | Morgan | F | Montana | US | 1 | Canyons by UTMB 100M 2023 (32 hours) |
| 115189 | Beazley | Chris | M | Queensland | AU | 1 | Blackall 100K 100km 2023 (18 hours) |
| 110632 | BECK | Arnaud | M | Réunion | RE | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 109121 | Beck | Christine | F | il de france | DE | 4 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 102662 | Becker | David | M | PA | US | 32 | Rim to River 100M 2023 (32 hours) |
| 102583 | Becker | Lea | F | PA | US | 32 | Twisted Branch 100km 2023 (20 hours) |
| 109142 | Becker | Shawn | M | VA | US | 2 | Rim to River 100M 2023 (32 hours) |
| 118500 | Becker | Ulrich | M | - | GB | 1 | Istria by UTMB 110km 2023 (24 hours) |
| 111824 | Beckham | Tony | M | California | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 103164 | Bedolla | Samuel | M | CA | US | 32 | Quicksilver 100km 2023 (17 hours) |
| 112343 | bedsun | michael | M | MI | US | 2 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 114603 | Beebe | Brandie | F | North Carolina | US | 2 | No Business 100M 2023 (33.5 hours) |
| 107437 | Beeninga | Matt | M | WA | US | 4 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 106136 | Beggio | Jacopo | M | ITA | IT | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 103263 | Beggs | Mark | M | AL | US | 1 | Western States 100M 2023 (30 hours) |
| 100486 | Begic | Kristijan | M | CT | US | 8 | Twisted Branch 100km 2023 (20 hours) |
| 118292 | Behrendt | Adam | M | Montana | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 115042 | Behrens | Bjoern | M | Bavaria | DE | 1 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 114915 | Behrens | Malachi | M | NE | US | 1 | Wasatch Front 100M 2023 (36 hours) |
| 114316 | Behunin | John | M | UT | US | 2 | Grindstone 100M 2023 (38 hours) |
| 115646 | Beike | Fred | M | Ohio | US | 1 | Laurel Highlands 70.5M 2023 (20 hours) |
| 108038 | Bejil | Abraham | M | Texas | US | 4 | Cruel Jewel 106M 2023 (48 hours) |
| 116972 | Belcourt | Conway | M | AB | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 118625 | Belforti | Gabriel | M | Texas | US | 1 | Brazos Bend 100M 2022 (30 hours) |
| 112190 | Belisle | Alex | M | UT | US | 2 | Fat Dog 120M 2023 (48 hours) |
| 115999 | Bell | Heather | F | NV | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 106700 | Bell | Ian | M | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) | ||
| 116898 | Bell | Jeffrey | M | MO | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 117314 | Bell | Michael | M | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 102303 | Belling | Sean | M | OR | US | 128 | Oregon Cascades 100M 2023 (32:01:18) |
| 106188 | Bellorini | Jose Ignacio | M | ARG | AR | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 105154 | Beltz | Matthew | M | CA | US | 2 | Miwok 100km 2023 (15.5 hours) |
| 110879 | Belus | Matt | M | AZ | US | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 118812 | Benadum Jr | Phil | M | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 115087 | Bender | Adam | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 105619 | Bender | Chris | M | CA | US | 16 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 108238 | Bendt | Mike | M | SD | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 106591 | Benefield | Brandon | M | WA | US | 2 | Cascade Crest 100M 2023 (35 hours) |
| 118139 | Benes | Kevin | M | CO | US | 1 | Bear, The 100M 2023 (36 hours) |
| 115890 | Benesh | LeeAnn | F | ID | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 115129 | Benham | john | M | Ohio | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 116995 | Benjamin | Michael | M | CA | US | 1 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 101088 | Bennett | Heidi | F | UT | US | 8 | Wasatch Front 100M 2023 (36 hours) |
| 105141 | Bennett | Irving | M | PAN | PA | 16 | Massanutten 100M 2023 (36 hours) |
| 102271 | Bennett | James | M | GBR | GB | 32 | North Downs Way 100M 2023 (30 hours) |
| 112925 | Bennett | Nadine | F | London | GB | 2 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 102553 | Bennett | Simon | M | GBR | GB | 2 | Hardwolds 80M 2022 (24 hours) |
| 116983 | Bennett | Steph | F | WASHINGTON | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 117032 | Bennett | Tanya | F | Ho Chi Minh City | VN | 1 | Vietnam Mountain Marathon 100km 2023 (27 hours) |
| 112807 | bennie | david | M | NSW | AU | 2 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 116031 | Bennion | Steven | M | CO | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 106705 | Benoit | Charles | M | 8 | Canyons by UTMB 100km 2023 (18 hours) | ||
| 104290 | Benoit | Richard | M | OR | US | 1 | Western States 100M 2023 (30 hours) |
| 101326 | Benshoff | Michelle | F | PA | US | 16 | Grindstone 100km 2023 (18 hours) |
| 116631 | Bensko | Jenna | F | CO | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 100214 | Bensted | Melissa | F | AUS | AU | 1 | Western States 100M 2023 (30 hours) |
| 116765 | Bentley | Chris | M | BC | CA | 1 | Black Canyon 100km 2023 (17 hours) |
| 115091 | Bentley | Sheri | F | BC | CA | 1 | Black Canyon 100km 2023 (17 hours) |
| 109867 | Benvie | Ben | M | Ontario | CA | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104230 | Benway | Karen | F | VT | US | 4 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 117623 | Benzeghiba | Malik | M | Loire | FR | 1 | Vietnam Mountain Marathon 100km 2023 (27 hours) |
| 118253 | Berberich | Craig | M | Colorado | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 117721 | Berdanier | Aaron | M | NC | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 110380 | Berdine | Matthew | M | CO | US | 4 | Hardrock 100M 2023 (48 hours) |
| 118644 | BERENGUER | Émilie | F | Normandie | FR | 1 | Nice Côte d'Azur by UTMB 159km 2023 (48 hours) |
| 118643 | BERENGUER | Pascal | M | Normandie | FR | 1 | Nice Côte d'Azur by UTMB 159km 2023 (48 hours) |
| 113955 | Berg | Brad | M | GA | US | 2 | Georgia Death Race 74M 2023 (23 hours) |
| 104726 | Berg | Olov | M | SWE | SE | 32 | Canal Corridor 100 100M 2023 (30 hours) |
| 100009 | Berger | Aaron | M | AZ | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 101790 | Berger | Dan | M | CA | US | 8 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104217 | Bergeron | Greg | M | CA | US | 32 | Leona Divide 100km 2023 (16 hours) |
| 100068 | Bergeson | Soren | M | CA | US | 8 | Cuyamaca 100km 2023 (17 hours) |
| 115674 | Berghout | Hanna | F | North Carolina | US | 1 | Umstead 100M 2023 (30 hours) |
| 118606 | Bergiers | Benjamin | M | Brussels | BE | 1 | Grand Trail des Lacs et Châteaux 165km 2023 (40 hours) |
| 116829 | Berglund | Eric | M | Ontario | CA | 1 | Superior 100 100M 2023 (38 hours) |
| 111775 | Bergman | Joshua | M | Alberta | CA | 2 | Canadian Death Race 125km 2023 (24 hours) |
| 118566 | Bergquist | Michael | M | UT | US | 1 | Wasatch Front 100M 2023 (36 hours) |
| 117819 | Bergwall | Hanna | F | Stockholm | SE | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 115975 | Berkey | Andrew | M | IN | US | 1 | Indiana 100M 2023 (30 hours) |
| 118493 | Bernaciak | Dominik | M | Warminsko-Mazurskie | PL | 1 | Łemkowyna Ultra-Trail 150km 2023 (35 hours) |
| 109778 | Bernard | Nicolas | M | isère | FR | 4 | Ultra Tour Monte Rosa 170km 2023 (60 hours) |
| 108758 | Bernard | Yannick | M | QC | CA | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118385 | Bernardini | Benjamin | M | Bouches-du-Rhône | FR | 1 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 109656 | Bernardino | Fernando | M | London | GB | 4 | Tor des Géants 330km 2023 (132 hours) |
| 104577 | Bernhisel | Drew | M | TX | US | 2 | Brazos Bend 100M 2022 (30 hours) |
| 103285 | Bernier | Craig | M | NJ | US | 8 | Twisted Branch 100km 2023 (20 hours) |
| 104751 | Bernosky | Stefanie | F | WA | US | 128 | Rim to River 100M 2023 (32 hours) |
| 116652 | Bernovsky | Martin | M | Slovakia | SK | 1 | Javornicka 105km 2023 (24 hours) |
| 113527 | Bernstein | Michael | M | Nj | US | 2 | Burning River 100M 2023 (30 hours) |
| 103080 | Berquam | Paul | M | CA | US | 8 | Javelina Jundred 100M 2023 (30 hours) |
| 116363 | Berrang | Iz | F | Washington | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 111724 | Berruel | Xavier | M | Québec | CA | 2 | Mohican 100M 2023 (32 hours) |
| 113265 | Berry | Colin | M | TAS | AU | 2 | Bighorn 100M 2023 (35 hours) |
| 115420 | Berry | Robert | M | Tennessee | US | 1 | No Business 100M 2023 (33.5 hours) |
| 117410 | Berry | Stan | M | OK | US | 1 | Brazos Bend 100M 2022 (30 hours) |
| 117977 | Berteau | Franck | M | Ile-de-France | FR | 1 | Transgrancanaria 125km 2023 (28 hours) |
| 100692 | Berti | Evan | M | NJ | US | 8 | Cocodona 250M 2023 (125 hours) |
| 103069 | Bertot | Jeff | M | UT | US | 4 | Pinhoti 100M 2023 (31 hours) |
| 105920 | Bertram | John | M | OH | US | 16 | Bear, The 100M 2023 (36 hours) |
| 117830 | Bertrand | Thibault | M | Marne | FR | 1 | Tuscany Crossing 103km 2023 (21 hours) |
| 118794 | Beskar | Joel | M | Wisconsin | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 116147 | Besson | Nicholas | M | OR | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 111467 | Best | Iain | M | VIC | AU | 2 | Guzzler Ultra 100km 2023 (24 hours) |
| 119116 | Beswick | Lauren | F | Victoria | AU | 1 | Surf Coast Century 100km 2023 (16 hours) |
| 111123 | Betancourt | Nicolas | M | Florida | US | 2 | Long Haul 100M 2023 (30 hours) |
| 116561 | Betancur | Amanda | F | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 110134 | Bethencourt Jorge | Guillermo | M | Las Palmas | ES | 1 | Never Summer 103km 2023 (23 hours) |
| 109463 | Betouret | Sebastien | M | Greater London | GB | 4 | Lakeland 100M 2023 (40 hours) |
| 108223 | Betrus | Christopher | M | NY | US | 4 | Twisted Branch 100km 2023 (20 hours) |
| 117483 | Betten | Matt | M | NH | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 108343 | Betten | Sebastian | M | QLD | AU | 4 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 117881 | Betts | Kellen | M | WA | US | 1 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 111939 | Betz | Craig | M | FL | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 102592 | Beuke | Donald | M | CO | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 100434 | Beutler | Roger | M | AZ | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 103694 | Beveridge | Ross | M | GBR | GB | 4 | Lakeland 100M 2023 (40 hours) |
| 108049 | Beveroth | Christopher | M | IL | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 117146 | Bevilaqua | Kate | F | Western Australia | AU | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 117901 | Beville | Chris | M | California | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 100717 | Bevins | Micah | M | OK | US | 8 | Rio Del Lago 100M 2023 (30 hours) |
| 118379 | Beyls | Pieter-Jan | M | London | GB | 1 | Val d'Aran by UTMB, Camins de Hèr 105km 2023 (26 hours) |
| 102159 | Bhansali | Vineer | M | CA | US | 16 | Run Rabbit Run 100M 2023 (36 hours) |
| 106706 | Bhasin | Saurabh | M | 32 | Canal Corridor 100 100M 2023 (30 hours) | ||
| 110130 | Bhosle | Amit | M | WA | US | 2 | Siskiyou Outback 100km 2023 (17 hours) |
| 103241 | Bianchi | Anthony | M | AZ | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 102439 | Biber-Brewer | Rachel | F | CO | US | 8 | San Diego 100M 2023 (32 hours) |
| 115507 | Bickers | Alex | M | IN | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 101708 | Bickerstaff | Henry | M | OK | US | 8 | Arkansas Traveler 100M 2023 (30 hours) |
| 117872 | Bicknell | Kayla | F | NV | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 119022 | Biddison | Ken | M | CO | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 111696 | Bielby | William | M | Greater London | GB | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118641 | Bier | Elianna | F | AZ | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 118150 | Bierema | Jordan | M | Ontario | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 113655 | Biernacki | Benoit | M | France | US | 2 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 115512 | Bierwirth | Paul | M | NM | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 113666 | BIGAN | Guillaume | M | Doubs | FR | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115145 | Bigman | Matthew | M | OR | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 116502 | BIGO | JEAN BAPTISTE | M | Nord | FR | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 103756 | Bigot | Simon | M | FRA | FR | 4 | Grand Raid des Pyrénées - Ultra 160 160km 2023 (48 hours) |
| 117583 | Bijsma | Lourens | M | Noord-Holland | NL | 1 | Istria by UTMB 168km 2023 (46 hours) |
| 114573 | Bilegan | Cristian | M | BistritaNasaud | RO | 1 | Western States 100M 2023 (30 hours) |
| 103148 | Bilou | Travis | M | AB | CA | 1 | Western States 100M 2023 (30 hours) |
| 116799 | Binion | Wade | M | Texas | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 109012 | Birch | Evan | U | Alberta | CA | 2 | Canadian Death Race 125km 2023 (24 hours) |
| 116184 | Birch | Jason | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 114591 | Bird | James | M | MO | US | 2 | Arkansas Traveler 100M 2023 (30 hours) |
| 100806 | Bird | Nora | F | Minnesota | US | 64 | Massanutten 100M 2023 (36 hours) |
| 117073 | Birdsall | Nathan | M | Idaho | US | 1 | IMTUF 100M 2023 (36 hours) |
| 107483 | Birdsong | Cassady | F | CO | US | 4 | Run Rabbit Run 100M 2023 (36 hours) |
| 113866 | Biren | Robyn | F | North Carolina | US | 2 | No Business 100M 2023 (33.5 hours) |
| 112084 | Birkel | Brad | M | WI | US | 2 | Cuyamaca 100km 2023 (17 hours) |
| 113865 | Birkemeyer | Ryan | M | AZ | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 116900 | Birkholz | Shad | M | MT | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 117490 | Biscaha | Eileen | F | CA | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 117778 | Bishop | Brad | M | Colorado | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 118709 | Bishop | David | M | Utah | US | 1 | Wasatch Front 100M 2023 (36 hours) |
| 118530 | Bisineer | Maya | N | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 112006 | Bissett | Mark | M | Worcestershire | GB | 2 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 115702 | Bitter | Zach | M | TX | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 106656 | Bitterman | Todd | M | NY | US | 32 | Massanutten 100M 2023 (36 hours) |
| 113479 | Bittick | Benjamin | M | California | US | 2 | Rio Del Lago 100M 2023 (30 hours) |
| 103093 | Bittner | Norm | M | NJ | US | 4 | Twisted Branch 100km 2023 (20 hours) |
| 117803 | Bizub | Stanley | M | North Carolina | US | 1 | Umstead 100M 2023 (30 hours) |
| 118809 | Bjellquist-Ledger | Ryan | M | TX | US | 1 | Grindstone 100km 2023 (18 hours) |
| 108485 | Bjerke | Harald | M | Viken | NO | 2 | Soria Moria til Verden Ende 100M 2023 (35 hours) |
| 116198 | Bjork | Erin | F | MN | US | 1 | Superior 100 100M 2023 (38 hours) |
| 103770 | Black | Austin | M | NH | US | 8 | Fat Dog 120M 2023 (48 hours) |
| 105219 | Black | Jeff | M | ID | US | 4 | Mountain Lakes 100M 2023 (30 hours) |
| 118201 | Black | Olivia | F | West Virginia | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 116274 | Black | Shannon | F | WA | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 104554 | Blackard | Michelle | F | AZ | US | 2 | High Lonesome 100M 2023 (37 hours) |
| 117485 | Blackburn | Craig | M | AB | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 116210 | Blackwell | Adam | M | Virginia | US | 1 | Eastern States 100M 2023 (36 hours) |
| 106104 | Blackwell | James | M | WY | US | 32 | Bighorn 100M 2023 (35 hours) |
| 100591 | Blaha | Martin | M | CZE | CZ | 8 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 107651 | Blake | Chandler | M | Utah | US | 2 | Bear, The 100M 2023 (36 hours) |
| 114142 | Blakeley | Mark | M | Massachusetts | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 103230 | Blakemore | Ashley | F | CO | US | 8 | Run Rabbit Run 100M 2023 (36 hours) |
| 105777 | Blakeney | Charles | M | CA | US | 4 | Quicksilver 100km 2023 (17 hours) |
| 109612 | Blanchard | Felix-Antoine | M | Québec | CA | 4 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 118284 | Blanchard | Jack | M | England | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 107707 | Blanchard | Justin | M | WA | US | 4 | Hennepin 100M 2023 (30 hours) |
| 112936 | Bland | Ellis | M | Lancashire | GB | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 108309 | Bland | James | M | Manawatu | NZ | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 115839 | Blankenship | Brandon | M | CA | US | 1 | San Diego 100M 2023 (32 hours) |
| 106707 | Blankenship | Jon | M | Montana | US | 1 | Western States 100M 2023 (30 hours) |
| 117004 | Blanton | James | M | Nsw | AU | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 118145 | Blascyk | Dan | M | MN | US | 1 | Superior 100 100M 2023 (38 hours) |
| 118879 | Blayden | Lisa | F | Northumberland | GB | 1 | Thames Path 100 100M 2023 (28 hours) |
| 100001 | Blea | Stephen | M | CA | US | 16 | Rio Del Lago 100M 2023 (30 hours) |
| 101637 | Bledsoe | Jim | M | UT | US | 64 | Zion 100km 2023 (19 hours) |
| 109231 | Blessing | Ben | M | ID | US | 2 | Mountain Lakes 100M 2023 (30 hours) |
| 119028 | Blessing | Justin | M | Virginia | US | 1 | Hellgate 100km 2022 (17 hours) |
| 118577 | Bleuvais | Florian | M | Bouches du Rhone | FR | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 116785 | blicher | sofie | F | ca | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 100012 | Bligan | Carl | M | PA | US | 8 | Hellgate 100km 2022 (17 hours) |
| 106708 | Blinn | Brenda | F | 1 | Western States 100M 2023 (30 hours) | ||
| 112631 | Blinn | Rachel | F | NC | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 110883 | Bliss | Joe | M | Michigan | US | 4 | Hennepin 100M 2023 (30 hours) |
| 102757 | Bliss | Nathan | M | MN | US | 8 | Bigfoot 206M 2023 (100 hours) |
| 116724 | Block | Christophe | M | Arkansas | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 103929 | Block | Travis | M | MN | US | 16 | Javelina Jundred 100M 2023 (30 hours) |
| 115252 | Bloksa | Martin | M | Prague | CZ | 1 | Tuscany Crossing 103km 2023 (21 hours) |
| 101264 | Blomgren | Wade | M | CA | US | 16 | Zion 100km 2023 (19 hours) |
| 109152 | Blondeau | Amanda | F | Virginia | US | 4 | Rim to River 100M 2023 (32 hours) |
| 115549 | Blondelle | Bram | M | Flanders | BE | 1 | Swiss Alps 100M 2023 (49 hours) |
| 106240 | Blonski | Daniel | M | SVK | SK | 8 | Trail 100 Andorra by UTMB 105km 2023 (30 hours) |
| 110818 | Bloom | Aaron | M | GA | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 107795 | Bloom | Ilene | F | CO | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 118194 | Blosser | Nathan | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 115658 | Blossom | Jarrod | N | MI | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 113362 | Bloudek | Ondřej | M | Prague | CZ | 2 | Krakonosova Stovka 100km 2023 (22 hours) |
| 118496 | Blum | Markus | M | Thuringia | DE | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 119112 | Blumberg | Faye | F | CO | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 118049 | Blythe | Joshua | M | VA | US | 1 | Grindstone 100km 2023 (18 hours) |
| 117348 | Bobowski | Andrew | M | NC | US | 1 | Umstead 100M 2023 (30 hours) |
| 108587 | Bodi | Pavel | M | Kilkenny | SK | 2 | Kerry Way Ultra 101km 2023 (20 hours) |
| 109609 | Bodle | Bradley | M | WA | US | 4 | Quicksilver 100km 2023 (17 hours) |
| 107519 | Bodle | Kevin | M | WA | US | 4 | Cuyamaca 100km 2023 (17 hours) |
| 116203 | Bodnyk | Kyle | M | Oregon | US | 1 | Waldo 100km 2023 (18 hours) |
| 117100 | Bodolec | Antoine | M | Bretagne | FR | 1 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 111250 | Boecker | Daniel | M | NRW | DE | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 111924 | Boelk | Michael | M | Minnesota | US | 2 | Hennepin 100M 2023 (30 hours) |
| 116320 | Boese | Benjamin | N | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 114413 | Boesen | Shani | F | AZ | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 115146 | Boeyer | Jim | M | GA | US | 1 | Bigfoot 206M 2023 (100 hours) |
| 110752 | Bogdaschewskyi | Todd | M | Ohio | US | 2 | Mohican 100M 2023 (32 hours) |
| 112850 | Bogod | Boris | M | Darom | IL | 2 | Race to the Stones 100km 2023 (17 hours) |
| 117029 | Bogus | Andrew | M | Ca | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 117631 | Bohannon | Adam | M | CA | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 113565 | Bohdanowycz | Stefan | M | New york | US | 2 | Crazy Mountain 100M 2023 (36 hours) |
| 115630 | Bohmke | Scott | M | VA | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 118124 | Bohnett | Jeremy | M | TX | US | 1 | Rim to River 100M 2023 (32 hours) |
| 113050 | Bohrer | Brian | M | CO | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 118852 | Bohrer | Sabrina | F | NH | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 106307 | Boifava | Alessandra | F | ITA | IT | 4 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 114533 | Boike | Aaron | M | MN | US | 2 | Superior 100 100M 2023 (38 hours) |
| 118402 | Boisaubin | Jesse | M | OR | US | 1 | Never Summer 103km 2023 (23 hours) |
| 116598 | Boisvenue | melissa | F | Alberta | CA | 1 | Lost Soul Ultra 100km 2023 (21 hours) |
| 102660 | Bökman | Jakob | M | SWE | SE | 1 | Täby Extreme Challenge 100 100M 2023 (30 hours) |
| 117345 | Boler | Eric | M | Minnesota | US | 1 | Burning River 100M 2023 (30 hours) |
| 114269 | Boler | James | M | Tennessee | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 109949 | Boley | Brianna | F | WA | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 107692 | Bolin | Jeffery | M | TN | US | 4 | Kettle Moraine 100M 2023 (30 hours) |
| 118250 | Bolk | Herman | M | Auckland | NZ | 1 | Taupo 100k 100km 2023 (17 hours) |
| 107659 | Bolton | Ryan | M | QLD | AU | 2 | Blackall 100K 100km 2023 (18 hours) |
| 111622 | Bolyard | Chris | M | MO | US | 2 | Kettle Moraine 100M 2023 (30 hours) |
| 112160 | Bolzoli | Camilla | F | Italia | IT | 2 | Tuscany Crossing 160km 2023 (32 hours) |
| 112424 | Bon | Stephane | M | Québec | CA | 2 | Quebec Mega Trail 110km 2023 (22 hours) |
| 118252 | Bonache | Marta | F | Cataluña | ES | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 118217 | Bond | Keiren | F | OR | US | 1 | Bear, The 100M 2023 (36 hours) |
| 112017 | Bond | Natalie | F | Montana | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 115202 | Bondue | Maxime | M | Bouches du Rhone | FR | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 115768 | Bondy | Daniel | M | New York | US | 1 | Never Summer 103km 2023 (23 hours) |
| 117511 | Bonfante | Marco | M | ITALIA | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 110852 | Bongartz | Meghan | F | VT | US | 2 | Gorge Waterfalls 100km 2023 (17 hours) |
| 118020 | Bonham | Aaron | M | GA | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 118063 | Bonham | Ryder | M | AR | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 116018 | Bonner | Scott | M | Devon | US | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 102908 | Bonnett-Natraj | Karen | F | CA | US | 4 | Rio Del Lago 100M 2023 (30 hours) |
| 111440 | Booher | David | M | OH | US | 2 | Burning River 100M 2023 (30 hours) |
| 100657 | Booher | Lisa | F | AL | US | 1 | Western States 100M 2023 (30 hours) |
| 106709 | Boone | Amelia | F | 8 | Cascade Crest 100M 2023 (35 hours) | ||
| 112420 | Boone | Melanie | F | CA | US | 2 | Sean O'Brien 100km 2023 (16 hours) |
| 111588 | Boosey | Neil | M | Surrey | GB | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115228 | Boote | Andrew | M | Devon | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 118704 | Booth | Brian | M | AZ - Arizona | US | 1 | Cocodona 250M 2023 (125 hours) |
| 101321 | Booth | Debbie | F | CA | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 105842 | Booth | Dimi | F | GBR | GB | 4 | Lakeland 100M 2023 (40 hours) |
| 101070 | Booth | Drew | M | IL | US | 4 | Tunnel Hill 100M 2022 (30 hours) |
| 105638 | Booth | John | M | PA | US | 16 | Grindstone 100km 2023 (18 hours) |
| 112458 | Booth | Sam | M | Lancashire | GB | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 113773 | Booth | Sarah | F | Oklahoma | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 105924 | Boothroyd | Dave | M | GBR | GB | 4 | Race to the Stones 100km 2023 (17 hours) |
| 111241 | Boots | Byron | M | OR | US | 2 | Zion 100km 2023 (19 hours) |
| 116989 | Borck | Bob | M | CA | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 112605 | Borden | Kortnee | M | Ontario | CA | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 108129 | Borden | Timothy | M | California | US | 4 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 109655 | Bordenave | Garrett | M | CA | US | 4 | Canyons by UTMB 100km 2023 (18 hours) |
| 117272 | BORDIN | WILLIAN | M | Rio Grande do Sul | BR | 1 | Istria by UTMB 110km 2023 (24 hours) |
| 118387 | Borer | Eric | M | MN | US | 1 | Superior 100 100M 2023 (38 hours) |
| 111281 | Borga | Steve | M | OH | US | 2 | Laurel Highlands 70.5M 2023 (20 hours) |
| 118137 | Borges | Paige | F | California | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 117237 | Borgialli | Riccardo | M | VB | IT | 1 | Istria by UTMB 110km 2023 (24 hours) |
| 115938 | Borgmeier | Emilee | F | UT | US | 1 | High Lonesome 100M 2023 (37 hours) |
| 116446 | Borisov | Nikita | M | IL | US | 1 | Umstead 100M 2023 (30 hours) |
| 112932 | Borland | Matt | M | NC | US | 2 | Indiana 100M 2023 (30 hours) |
| 117720 | Borne | Aurélien | M | Alpes Maritimes | FR | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 117506 | Bornstein | Joshua | M | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 115870 | Borrego | Blake | M | Texas | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 116495 | Borrell | Kendall | F | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 112153 | Borrevik | Kiley | M | OR | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 102933 | Borst | Michael | M | WI | US | 2 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 107881 | Borsuk | Alex | F | oregon | US | 2 | Canyons by UTMB 100M 2023 (32 hours) |
| 115742 | BOSIO | WALTER | M | ITALY | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 116894 | Bosredon | Anthony | M | Quebec | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 108576 | Bost | Bryan | M | FL | US | 2 | Long Haul 100M 2023 (30 hours) |
| 117287 | Boston | Andrew | M | NJ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 118985 | Bosworth | Christian | M | California | US | 1 | Zion 100km 2023 (19 hours) |
| 106172 | Bosworth | Sam | M | CA | US | 4 | Tahoe 200 202M 2023 (100 hours) |
| 116576 | Botma | Bryan | M | Ca | US | 1 | Leona Divide 100km 2023 (16 hours) |
| 115829 | Botta | Joris | M | Drôme | FR | 1 | Trail Alsace Grand Est by UTMB - Ultra-Trail des Païens 109km 2023 (21 hours) |
| 118993 | Bouchard | Anne | F | Quebec | CA | 1 | Quebec Mega Trail 100M 2023 (40 hours) |
| 114375 | Bouchard | Geneviève | F | Quebec | CA | 2 | Quebec Mega Trail 110km 2023 (22 hours) |
| 108053 | Boucheix | Alexandre | M | Val de Marne | FR | 4 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 107779 | Bouchey | Joseph | M | NV | US | 1 | Western States 100M 2023 (30 hours) |
| 118922 | Bouck | Ken | M | BC | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 116357 | Bouge | Amber | F | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 115262 | Bougen | Scott | M | Auckland | NZ | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 114950 | Boulet | Vincent | M | Quebec | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 112387 | Bouliere | Fabien | M | France | FR | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116580 | Bour | Guillaume | M | Rhône Alpes | FR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116730 | Bourgeois | Anne-Marie | F | ON | CA | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 115375 | Bourges | Gwendal | M | Bretagne | FR | 1 | Ultra Trail du Saint-Jacques by UTMB 123km 2023 (26 hours) |
| 117728 | Bourget | Simon | M | Ontario | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 112353 | Bourn | Justin | M | CO | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 107575 | Bourne | Debra | F | Kent | GB | 2 | Thames Path 100 100M 2023 (28 hours) |
| 112987 | Bourque | Jocelyn | M | NB | CA | 2 | Restonica Trail by UTMB - Ultra-Trail® di Corsica 110km 2023 (36 hours) |
| 117919 | Bousleiman | Salim | M | NY | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 116294 | Bousquet | Michele | F | California | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 107419 | Bousquet | Michelle | F | Quebec | CA | 2 | Cocodona 250M 2023 (125 hours) |
| 111872 | Boutros | Philippe | M | Idaho | US | 2 | IMTUF 100M 2023 (36 hours) |
| 116326 | Boutros | Sydney | F | ID | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 116324 | Bowden | Sierra | F | CA | US | 1 | Beaverhead 100km 2023 (20 hours) |
| 105011 | Bowden | Upton | M | MI | US | 16 | Beaverhead 100km 2023 (20 hours) |
| 114868 | Bowen | Kevin | M | Nottinghamshire | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 117025 | Bowen | Kristin | F | CA | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 101449 | Bowen | Megan | F | MT | US | 8 | Puerto Vallarta México by UTMB 100km 2023 (18 hours) |
| 119129 | Bowens | Aaron | M | Arizona | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 115525 | Bowers | Amanda | F | Georgia | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 115354 | Bowers | Jeffrey | M | Ohio | US | 1 | Laurel Highlands 70.5M 2023 (20 hours) |
| 111386 | Bowman | Jacob | M | Kentucky | US | 2 | Rim to River 100M 2023 (32 hours) |
| 108593 | Bowman | Sean | M | Indiana | US | 4 | Leadville Trail 100M 2023 (30 hours) |
| 103229 | Bowyer | Gregory | M | CA | US | 16 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 115433 | Boyd | Andrew | M | Pennsylvania | US | 1 | Laurel Highlands 70.5M 2023 (20 hours) |
| 115905 | Boyd | Deron | M | Ohio | US | 1 | Canal Corridor 100 100M 2023 (30 hours) |
| 118799 | Boyd | Trey | M | OH | US | 1 | Canal Corridor 100 100M 2023 (30 hours) |
| 115804 | Boyle | Brian | M | MD | US | 1 | Grindstone 100km 2023 (18 hours) |
| 116794 | Boyle | Courtney | F | CO | US | 1 | Cocodona 250M 2023 (125 hours) |
| 108201 | Boyle | John | M | Dublin | IE | 4 | Kerry Way Ultra 193km 2023 (40 hours) |
| 116574 | Boyle | Travis | M | Victoria | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 110553 | Boynton | Naomi | F | New Zealand | NZ | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 109370 | Bozzoli | Jacopo | M | Bo | IT | 4 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 117747 | Brachet | Vincent | M | Ile de France | FR | 1 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 117877 | Bracht | Garrett | M | GA | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 115038 | Brack | Jesse | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 114898 | Bracken | Brendan | M | BC | CA | 1 | Cascade Crest 100M 2023 (35 hours) |
| 114724 | Brackett | David | M | Taiwan | TW | 1 | Formosa Trail 104km 2022 (28 hours) |
| 107535 | Brackett | Jennifer | F | CA | US | 4 | Rio Del Lago 100M 2023 (30 hours) |
| 118103 | Bracon | Melvyn | M | Rhône | FR | 1 | Ultra Trail du Saint-Jacques by UTMB 123km 2023 (26 hours) |
| 107729 | Bracy | Addie | F | CO | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 111271 | Bradea | Benjamin | M | OR | US | 2 | Pine to Palm 100M 2023 (34 hours) |
| 103876 | Braden | Bert | M | CA | US | 32 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 101844 | Bradfield | Kristin | F | NY | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 114854 | Bradley | Tim | M | Lincolnshire | GB | 1 | South Downs Way 100M 2023 (30 hours) |
| 101146 | Bradley-Jones | David | M | GBR | GB | 4 | Autumn 100M 2023 (28 hours) |
| 100771 | Bradner | Aaron | M | VA | US | 16 | Hellgate 100km 2022 (17 hours) |
| 108844 | Brady | Casey | F | Utah | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 111907 | Brady | Colin | M | Colorado | US | 2 | Never Summer 103km 2023 (23 hours) |
| 116142 | Brady | Donald | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 105253 | Brady | Elliot | M | BC | CA | 16 | Fat Dog 120M 2023 (48 hours) |
| 108764 | Brady | John | M | UT | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 104243 | Brady | Riley | F | PA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 112378 | Brady | Ryan | M | CA | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 112766 | Braeger | Greg | M | Colorado | US | 1 | Western States 100M 2023 (30 hours) |
| 117188 | Bragg | James | M | North Carolina | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 111970 | Braine | Gildas | M | England | GB | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 107599 | Braithwaite | Stephen | M | Cumbria | GB | 4 | Lakeland 100M 2023 (40 hours) |
| 117970 | Branch | James | M | GA | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 107572 | Brand | Christopher | M | NC | US | 4 | Grindstone 100M 2023 (38 hours) |
| 104674 | Brand | Naomi | F | ZAF | ZA | 8 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 117470 | Brandenberg | Michael | M | MD | US | 1 | Grindstone 100km 2023 (18 hours) |
| 118474 | Brandes | Dee | F | OH | US | 1 | Hennepin 100M 2023 (30 hours) |
| 112108 | Brandes | Peter | M | CO | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 110771 | Brandner | Erik | M | Minnesota | US | 4 | Leadville Trail 100M 2023 (30 hours) |
| 112138 | Brandt | Bo | M | NC | US | 2 | Miwok 100km 2023 (15.5 hours) |
| 109056 | Brandt | Eric | M | MN | US | 4 | Superior 100 100M 2023 (38 hours) |
| 117311 | Brandt | Jennifer | F | Utah | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 118451 | Brandt | Mattias | M | Smaland | SE | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 117855 | Brandt | Tyler | M | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 108744 | Branham | Jason | M | Pennsylvania | US | 4 | Grindstone 100km 2023 (18 hours) |
| 110014 | Branholm | Daniel | M | Västra Götalandsregionen | SE | 2 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 104470 | Branick-Abilla | Margaret | F | CA | US | 8 | Oregon Cascades 100M 2023 (32:01:18) |
| 102248 | Braninburg | Jody | M | CA | US | 128 | Rio Del Lago 100M 2023 (30 hours) |
| 108689 | Branislav | Branislav | M | Västra Götaland | SE | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 102279 | Brann | Erika | F | New South Wales | AU | 16 | Surf Coast Century 100km 2023 (16 hours) |
| 112404 | Bransford | Ellen | F | Tennessee | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 117416 | Brant | B | M | IL | US | 1 | Mohican 100M 2023 (32 hours) |
| 100353 | Brashear | Bob | M | KY | US | 16 | Tunnel Hill 100M 2022 (30 hours) |
| 111859 | Bratko | Helena | F | OH | US | 2 | Indiana 100M 2023 (30 hours) |
| 116527 | Braun | Carolyn | F | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 100313 | Braun | Rhonda | F | NY | US | 1 | Western States 100M 2023 (30 hours) |
| 104556 | Braunlich | David | M | CO | US | 16 | Moab 238M 2023 (106 hours) |
| 118034 | Bray | Mary Beth | F | OH | US | 1 | Rim to River 100M 2023 (32 hours) |
| 103062 | Bray | Michael | M | AUS | AU | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115659 | Bray | Sally | F | GA | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 107618 | Brazil | Miles | M | NV | US | 4 | Leadville Trail 100M 2023 (30 hours) |
| 118817 | Breen | Kevin | M | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 108420 | Breen | Verity | F | CA | US | 4 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 115141 | Breezley | Jack | M | Colorado | US | 1 | Never Summer 103km 2023 (23 hours) |
| 101758 | Brehe | Michael | M | DEU | DE | 4 | Zugspitz 111km 2023 (25 hours) |
| 111134 | Breitenstine | Derek | M | CT | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 106550 | Brennan | James | M | AUS | AU | 8 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 117449 | Brennan | James | M | VA | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 115463 | Brennan | Paul | M | Northern Ireland | GB | 1 | Canyons by UTMB 100M 2023 (32 hours) |
| 118234 | Brester | Sonja | F | MT | US | 1 | Bighorn 100M 2023 (35 hours) |
| 103536 | Bretan | Jonathan | M | CA | US | 128 | Miwok 100km 2023 (15.5 hours) |
| 118864 | Bretelle | Manu | M | CA | US | 1 | Quicksilver 100km 2023 (17 hours) |
| 116386 | Brett | Jordan | M | British Columbia | CA | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 105347 | Bretz | Virgil | M | WA | US | 16 | Bigfoot 206M 2023 (100 hours) |
| 118531 | Bretz | Willem | M | Washington | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 110594 | Breuer | Reed | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 116316 | Brewer | Jessie | F | CA | US | 1 | Waldo 100km 2023 (18 hours) |
| 117018 | Brewer | Joanna | F | BC | CA | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 117718 | Brewster | Ian | M | South Yorkshire | GB | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 102474 | Brewster | James | M | GBR | GB | 4 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 105974 | Brey | Curt | M | WI | US | 1 | Western States 100M 2023 (30 hours) |
| 101144 | Breyfogle | James | M | AZ | US | 8 | Sean O'Brien 100km 2023 (16 hours) |
| 113193 | briand | matthieu | M | France | FR | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 113313 | Bricca | Greg | M | Ca | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 118542 | Bricca | Luke | M | TX | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 116778 | Briet | Numa | M | New York | US | 1 | Grindstone 100km 2023 (18 hours) |
| 117739 | Briggs | Dave | M | NV | US | 1 | Waldo 100km 2023 (18 hours) |
| 116380 | Briggs | Greg | M | Ca | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 116131 | Briggs | Matthew | M | Ontario | CA | 1 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 100915 | Briggs | Sadie | F | TX | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 116160 | Bright | Kathrine | F | PA | US | 1 | Eastern States 100M 2023 (36 hours) |
| 117440 | Bright | Randall | M | Arkansas | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 116987 | Brightbill | Kevin | M | OR | US | 1 | Siskiyou Outback 100km 2023 (17 hours) |
| 108477 | brignone | alberto | M | CN | IT | 2 | Istria by UTMB 110km 2023 (24 hours) |
| 107365 | Briley | Phil | M | Kent | GB | 2 | Autumn 100M 2023 (28 hours) |
| 116086 | Brin | Lisa | F | CO | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 118614 | Brink | David | M | DK | DK | 1 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 117337 | brink | mason | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 117053 | Briones | Jonardine | M | Benguet | PH | 1 | Pulag 100 Trail 118km 2023 (35 hours) |
| 118950 | briot | anthony | M | bourgogne | FR | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 114146 | Bristow | Matthew | M | CA | US | 2 | Sean O'Brien 100km 2023 (16 hours) |
| 118426 | Britt | Jonathan | M | Georgia | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 116313 | britt | mike | M | IL | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 114761 | Brlek | Matija | M | - | HR | 1 | Istria by UTMB 110km 2023 (24 hours) |
| 102699 | Broadhurst | Chris | M | AUS | AU | 1 | Western States 100M 2023 (30 hours) |
| 118126 | Broadmoore | Amy | F | MN | US | 1 | Superior 100 100M 2023 (38 hours) |
| 116986 | Broce | Luis | M | Panama | PA | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 109024 | Brochu | Felix-Olivier | M | Quebec | CA | 4 | Quebec Mega Trail 110km 2023 (22 hours) |
| 112780 | Brochu | Frederic | M | Québec | CA | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 114982 | Brochu | Sebastien | M | Quebec | CA | 1 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 113005 | Brochu | Serge | M | Quebec | CA | 2 | Quebec Mega Trail 100M 2023 (40 hours) |
| 103852 | Brock | Jason | M | UT | US | 2 | Bigfoot 206M 2023 (100 hours) |
| 103460 | Brock | Kenna | F | CO | US | 8 | IMTUF 100M 2023 (36 hours) |
| 104768 | Brockdorf | Carmen | F | FL | US | 8 | Wasatch Front 100M 2023 (36 hours) |
| 112620 | Brockman | Brian | M | Tennessee | US | 2 | Hennepin 100M 2023 (30 hours) |
| 116440 | Brockman | Jill | F | Mo | US | 1 | Hennepin 100M 2023 (30 hours) |
| 118275 | Brockman | Kevin | M | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 110801 | Broderick | Stacia | F | MA | US | 4 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 116896 | Broecker | Eric | M | Colorado | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 108568 | Broman | Marcus | M | Skåne | SE | 4 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 107435 | Bromley | Matt | M | MI | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 116818 | Bron | Eric | M | Ontario | CA | 1 | Superior 100 100M 2023 (38 hours) |
| 115988 | brones | benjamin | M | WA | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 102747 | Bronstein | Craig | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 115324 | Brook | Kate | F | Oxfordshire | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 116355 | Brook | Ken | M | Idaho | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 109728 | Brooks | Chloe | F | West Yorkshire | GB | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115322 | Brooks | Jakob | M | Ontario | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 107874 | Brooks | Jonathon | M | IL | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 101931 | Brooks | Kevin | M | WA | US | 16 | Cascade Crest 100M 2023 (35 hours) |
| 116404 | Brooks | Nicholas | M | Cheshire | GB | 1 | Lakeland 100M 2023 (40 hours) |
| 105901 | Brooks | Robert | M | NC | US | 16 | Umstead 100M 2023 (30 hours) |
| 102082 | Brooks | William | M | CA | US | 2 | Rio Del Lago 100M 2023 (30 hours) |
| 116639 | Brophy | Kelly | F | CO | US | 1 | High Lonesome 100M 2023 (37 hours) |
| 103178 | Bross | Ted | M | CO | US | 8 | Cruel Jewel 106M 2023 (48 hours) |
| 107154 | Brosseau | Philippe | M | Québec | CA | 4 | Quebec Mega Trail 110km 2023 (22 hours) |
| 110139 | Brossellier | Sebastien | M | Pays de la Loire | FR | 4 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 106718 | Brostella | Daniel | M | 16 | Never Summer 103km 2023 (23 hours) | ||
| 115815 | Brougher | Jackson | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 116673 | Brouillard Roy | William | M | Quebec | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 102062 | Brower | Chad | M | SD | US | 16 | Never Summer 103km 2023 (23 hours) |
| 108098 | Brower | Deryk | M | BC | CA | 2 | Fat Dog 120M 2023 (48 hours) |
| 115367 | Brown | Adam | M | Nsw | AU | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 108724 | Brown | Alaina | F | NE | US | 4 | Grindstone 100km 2023 (18 hours) |
| 115814 | Brown | Andrew | M | OR | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 106719 | Brown | Cassie | F | AR | US | 8 | Arkansas Traveler 100M 2023 (30 hours) |
| 117908 | Brown | Cooper | M | Oregon | US | 1 | Waldo 100km 2023 (18 hours) |
| 106288 | Brown | David | M | AL | US | 128 | Pinhoti 100M 2023 (31 hours) |
| 114825 | Brown | David | M | Surrey | GB | 1 | Ultra-Trail Snowdonia by UTMB 165km 2023 (50 hours) |
| 108018 | Brown | Deborah | F | OR | US | 2 | Mountain Lakes 100M 2023 (30 hours) |
| 109927 | Brown | Derek | M | MO | US | 2 | Superior 100 100M 2023 (38 hours) |
| 114312 | Brown | Edwin | M | MN | US | 2 | Georgia Death Race 74M 2023 (23 hours) |
| 109950 | Brown | Jeffrey | M | TX | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 118527 | Brown | Jessica | F | SC | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 115052 | Brown | Justin | M | TN | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 100132 | Brown | Kris | M | CA | US | 8 | Kosciusko by UTMB 100km 2022 (18 hours) |
| 102802 | Brown | Leah | F | OR | US | 8 | Mountain Lakes 100M 2023 (30 hours) |
| 117852 | Brown | Lee | M | MN | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 115912 | Brown | Mackenzie | M | Alberta | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 108700 | Brown | Mike | M | Arkansas | US | 2 | Arkansas Traveler 100M 2023 (30 hours) |
| 113827 | Brown | Mike | M | OKLAHOMA | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 114926 | Brown | Nicholas | M | Indiana | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 117807 | Brown | Oliver | M | Massachusetts | US | 1 | South Downs Way 100M 2023 (30 hours) |
| 109624 | Brown | Peter | M | CA | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 117642 | Brown | Robin | M | London | GB | 1 | Race to the Stones 100km 2023 (17 hours) |
| 109384 | Brown | Roderick | M | London | GB | 2 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 118125 | Brown | Samantha | F | California | US | 1 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 101038 | Brown | Susan | F | AB | CA | 16 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 113112 | Brown | Tom | M | West Sussex | GB | 2 | Autumn 100M 2023 (28 hours) |
| 112845 | Browne | Colleen | F | Western Cape | ZA | 2 | Ultra-Trail Cape Town 100km 2022 (21 hours) |
| 103519 | Browne | Glen | M | SGP | SG | 32 | Tarawera 100K 102km 2023 (17 hours) |
| 115727 | Browne | Melissa | F | WA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 118443 | Browning | Curt | M | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 113233 | Browning | Jeff | M | AZ | US | 2 | Bighorn 100M 2023 (35 hours) |
| 118399 | Browning | Jim | M | Minnesota | US | 1 | Superior 100 100M 2023 (38 hours) |
| 110026 | Browning | Kristina | F | VA | US | 4 | Rim to River 100M 2023 (32 hours) |
| 115144 | Brownlee | Holly | F | North Yorkshire | GB | 1 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 117444 | Brownrigg | David | M | MI | US | 1 | Cocodona 250M 2023 (125 hours) |
| 103028 | Broyer | Paul | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 117777 | Broz | Filip | M | Czech republic | CZ | 1 | Krakonosova Stovka 100km 2023 (22 hours) |
| 103131 | Bruce | Chad | M | CA | US | 2 | San Diego 100M 2023 (32 hours) |
| 117325 | Bruce | Kerry | F | OR | US | 1 | Sean O'Brien 100km 2023 (16 hours) |
| 115306 | Bruhnsen | Jan | M | Zug | CH | 1 | Swiss Alps 100km 2023 (22 hours) |
| 118168 | Brun | Nicolas | M | Genève | CH | 1 | Transgrancanaria 125km 2023 (28 hours) |
| 118757 | Brunelli | Elia | M | Varese | IT | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 117353 | Bruness | Christian | M | Bayern | DE | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115731 | Brunette | Mike | M | IL | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 114560 | Brunken | David | M | CA - California | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 117886 | Brunner | Erin | F | WA | US | 1 | Mountain Lakes 100M 2023 (30 hours) |
| 109952 | Brunner | Juergen | M | Austria | AT | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 104654 | Brunner | Radek | M | CZE | CZ | 4 | Krakonosova Stovka 100km 2023 (22 hours) |
| 101630 | Bruno | Benjamin | M | VT | US | 8 | IMTUF 100M 2023 (36 hours) |
| 105296 | Bruno | Christopher | M | MD | US | 16 | Rio Del Lago 100M 2023 (30 hours) |
| 103975 | Bruno | John | M | SC | US | 32 | Yeti (Virginia) 100M 2023 (30 hours) |
| 113727 | Bruno | Tobias | M | Haute-Savoie | FR | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 109651 | Brunton | Danny | M | Driffield | GB | 2 | Lakeland 100M 2023 (40 hours) |
| 109352 | Brunton | David | M | Lancs | GB | 4 | Lakeland 100M 2023 (40 hours) |
| 116516 | Brutger | Steven | N | MT | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 108972 | Bruun-Jensen | Jacob | M | Nevada | US | 4 | Cuyamaca 100km 2023 (17 hours) |
| 106485 | Bruzek | Jeffrey | M | MN | US | 4 | Superior 100 100M 2023 (38 hours) |
| 104465 | Bryan | Joey | M | CA | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 119044 | Bryant | Jub | M | Otago | NZ | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 117809 | Bryant | Rebecca | F | Select a state | NZ | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 117697 | Bryant | Shane | M | CA | US | 1 | Tor des Géants 330km 2023 (132 hours) |
| 107429 | Bubany | Shawn | M | New York | US | 4 | Twisted Branch 100km 2023 (20 hours) |
| 112659 | Bubri | Domenic | M | Colorado | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 102596 | Buccellato | Lee | M | GBR | GB | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 108052 | Bucci | Daniel | M | WA | US | 2 | Cascade Crest 100M 2023 (35 hours) |
| 109119 | Bucciarelli | Chris | M | FL | US | 2 | Long Haul 100M 2023 (30 hours) |
| 100104 | Buchan | Alexander | M | AUS | AU | 2 | Guzzler Ultra 100km 2023 (24 hours) |
| 110111 | Buchan | Scott | M | Il | US | 4 | Brazos Bend 100M 2022 (30 hours) |
| 106724 | Buchanan | Jared | M | Connecticut | US | 8 | Cocodona 250M 2023 (125 hours) |
| 100600 | Buchanan | Youa | F | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 115747 | Buchholtz | Amanda | F | Colorado | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 116027 | Buchman | Elizabeth | F | OH | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 115389 | Buchner | Felix | M | Bayern | DE | 1 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 103401 | Buchs | Mario | M | AUS | AU | 16 | Tarawera 100M 100M 2023 (36 hours) |
| 114779 | Büchsenschütz | David | M | Nordrhein-Westfalen | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 118551 | Buck | Brett | M | Ontario | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 117366 | Buckley | Jim | M | NV | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 105077 | Bucklin | Benjamin | M | WA | US | 16 | Bighorn 100M 2023 (35 hours) |
| 118420 | Budd | Natalie | F | ACT | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 115597 | Budde | Gary | M | TN | US | 1 | Long Haul 100M 2023 (30 hours) |
| 100713 | Budziak | Nathan | M | CA | US | 16 | Miwok 100km 2023 (15.5 hours) |
| 100273 | Buehler | Luzia | F | Graubuenden | CH | 1 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 116963 | Buell | Brian | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 107547 | Buffard | Sebastien | M | Occitanie | FR | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115384 | Buist | Dave l | M | London | GB | 1 | North Downs Way 100M 2023 (30 hours) |
| 100932 | Bujer | Ken | M | CA | US | 32 | Oregon Cascades 100M 2023 (32:01:18) |
| 118128 | Bulger | Jason | M | CO | US | 1 | Never Summer 103km 2023 (23 hours) |
| 114904 | Bull | Daniel | M | VIC | AU | 1 | Surf Coast Century 100km 2023 (16 hours) |
| 112039 | Bull | Jason | M | CO | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 111230 | Bultemeier | Ryan | M | IN | US | 2 | Mohican 100M 2023 (32 hours) |
| 112709 | Bunnell | Jenna | F | Ca | US | 2 | Rio Del Lago 100M 2023 (30 hours) |
| 106019 | Buraglio | Donald | M | CA | US | 32 | Oregon Cascades 100M 2023 (32:01:18) |
| 105858 | Burakian | Eli | M | VT | US | 64 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 108936 | Burch | Ryan | M | CO | US | 2 | Hardrock 100M 2023 (48 hours) |
| 116370 | Burchi | Bryce | M | Arizona | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 102058 | Burdette | Matthew | M | MD | US | 16 | Beaverhead 100km 2023 (20 hours) |
| 116875 | Burdick | Jared | M | NY | US | 1 | Grindstone 100km 2023 (18 hours) |
| 117780 | Burford | John | M | Canada | CA | 1 | Grindstone 100M 2023 (38 hours) |
| 102656 | Burger | Andy | M | CA | US | 2 | Rio Del Lago 100M 2023 (30 hours) |
| 118828 | Burger | Garrett | M | NV | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 111099 | Burger | Schalk | M | Gauteng | ZA | 2 | Blackall 100K 100km 2023 (18 hours) |
| 104103 | Burgess | Brady | M | CA | US | 16 | Javelina Jundred 100M 2023 (30 hours) |
| 118040 | Burgess | Porter | F | South Carolina | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 108330 | Burgo | Rebecca | F | NY | US | 4 | HOKA Bandera 100km 2023 (17 hours) |
| 118485 | Burgr | Robert | M | North Dakota | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 100568 | Burke | Brian | M | MA | US | 4 | Waldo 100km 2023 (18 hours) |
| 108055 | Burke | Ken | M | Ny | US | 2 | Crazy Mountain 100M 2023 (36 hours) |
| 117798 | Burke | Lexi | F | UT | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 109162 | burke | shaun | M | colorado | US | 2 | HOKA Bandera 100km 2023 (17 hours) |
| 107886 | Burke | Tyler | M | California | US | 1 | Western States 100M 2023 (30 hours) |
| 103297 | Burkett | Zachary | M | CA | US | 4 | Rio Del Lago 100M 2023 (30 hours) |
| 116725 | Burkhalter | Drew | M | GA | US | 1 | No Business 100M 2023 (33.5 hours) |
| 109525 | Burmeister | Jeremy | M | Colorado | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 115818 | Burmey | Nick | M | Manitoba | CA | 1 | Lost Soul Ultra 100km 2023 (21 hours) |
| 115264 | Burnett | Chris | M | Switzerland | GB | 1 | West Highland Way 95M 2023 (30 hours) |
| 113784 | Burnett | Jacob | M | Florida | US | 2 | HOKA Bandera 100km 2023 (17 hours) |
| 110637 | Burnett | Jimmy | M | Arizona | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 117392 | Burns | Geoffrey | M | Colorado | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 118148 | Burns | Jason | M | Saskatchewan | CA | 1 | Lost Soul Ultra 100km 2023 (21 hours) |
| 115502 | Burns | Megan | F | Oh | US | 1 | Burning River 100M 2023 (30 hours) |
| 118154 | Burns | Melissa | F | Saskatchewan | CA | 1 | Lost Soul Ultra 100km 2023 (21 hours) |
| 107894 | Burns | Zachary | M | Texas | US | 4 | Arkansas Traveler 100M 2023 (30 hours) |
| 110936 | Burpo | Kevin | M | TX | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 117140 | Burq | Robin | M | Essonne | FR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115343 | Burrer | Lukas | M | GA | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 111825 | Burris | Kristin | F | British Columbia | CA | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 110031 | Burris | Lester | M | Indiana | US | 4 | Kettle Moraine 100M 2023 (30 hours) |
| 113467 | Burrow | Trey | M | Texas | US | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 112992 | Burrowes | Lewis | M | UT | US | 2 | High Lonesome 100M 2023 (37 hours) |
| 109826 | Burrows | Matt | M | Alberta | CA | 4 | Canadian Death Race 125km 2023 (24 hours) |
| 111209 | Burrows | Reid | M | ON | CA | 2 | Leadville Trail 100M 2023 (30 hours) |
| 100006 | Burton | Brian | M | WA | US | 4 | Moab 238M 2023 (106 hours) |
| 114979 | Burton | John | M | CA | US | 1 | IMTUF 100M 2023 (36 hours) |
| 115153 | Burton | Joshua | M | NSW | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 117373 | Burton | Lucinda | F | Queensland | AU | 1 | Guzzler Ultra 100km 2023 (24 hours) |
| 112492 | Burton | Michelle | F | OH | US | 1 | No Business 100M 2023 (33.5 hours) |
| 103039 | Burton | Shona | F | AUS | AU | 4 | Blackall 100K 100km 2023 (18 hours) |
| 116771 | Busada | Michael | M | PA | US | 1 | Eastern States 100M 2023 (36 hours) |
| 118841 | Buschmeier | Karsten | M | NRW | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 102471 | Buse | Timothy | M | CO | US | 2 | High Lonesome 100M 2023 (37 hours) |
| 116806 | Bush | Scott | M | Oregon | US | 1 | Waldo 100km 2023 (18 hours) |
| 110937 | Bushko | Sergej | M | Florida | US | 2 | Long Haul 100M 2023 (30 hours) |
| 100151 | Bushroe | David | M | OH | US | 32 | Tunnel Hill 100M 2022 (30 hours) |
| 102942 | Busick | Karen | F | SC | US | 8 | Cocodona 250M 2023 (125 hours) |
| 118188 | Busolini | Adrian | M | Hertfordshire | GB | 1 | South Downs Way 100M 2023 (30 hours) |
| 110850 | Bussey | Patrick | M | Alabama | US | 2 | Pinhoti 100M 2023 (31 hours) |
| 118600 | Bustamante | fernando | M | Arizona | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 114270 | Bustamante Teran | Raul Alejandro | M | Mexico City | MX | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 117457 | Butcher | Kate | F | British Columbia | CA | 1 | High Lonesome 100M 2023 (37 hours) |
| 118620 | Butkiewicz | Timothy | M | MI | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 113113 | Butler | Aaron | M | KY | US | 2 | No Business 100M 2023 (33.5 hours) |
| 107369 | Butler | James | M | Gloucestershire | GB | 4 | Lakeland 100M 2023 (40 hours) |
| 118520 | Butler | Jason | M | Colorado | US | 1 | Grindstone 100km 2023 (18 hours) |
| 115455 | Butler | Mark | M | OH | US | 1 | Burning River 100M 2023 (30 hours) |
| 115748 | Butler | Randy | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 113664 | Butovich | Nicholas | M | IL | US | 2 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 116621 | Butt | Helen | F | Ontario | CA | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 100996 | Buttar | Rene | M | BC | CA | 16 | Zugspitz 111km 2023 (25 hours) |
| 116991 | Butterfield | Liz | F | Oregon | US | 1 | Waldo 100km 2023 (18 hours) |
| 104466 | Butz | Monika | F | MD | US | 16 | Cruel Jewel 106M 2023 (48 hours) |
| 107928 | Buurma | Nicole | F | WA | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 100866 | Buzansky | John | M | PA | US | 8 | Hennepin 100M 2023 (30 hours) |
| 109315 | Buzko | Yaroslav | M | CA | US | 4 | Canyons by UTMB 100km 2023 (18 hours) |
| 117898 | Bygdell | Johanna | F | Västernorrland | SE | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 105158 | Byrd | Jared | M | MD | US | 8 | Tunnel Hill 100M 2022 (30 hours) |
| 105310 | Byrd | William | M | OR | US | 2 | Beaverhead 100km 2023 (20 hours) |
| 104799 | Byrne | Gavin | M | IRL | IE | 8 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115303 | Byrne | Mark | M | Cheshire | GB | 1 | Lakeland 100M 2023 (40 hours) |
| 100170 | Byrne | Tommy | M | WI | US | 32 | Black Canyon 100km 2023 (17 hours) |
| 115993 | Byrnes | David | M | AZ | US | 1 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 103489 | Caballero | Rosendo | M | AZ | US | 1 | Western States 100M 2023 (30 hours) |
| 109874 | Cabanas | Lynnard | M | CA | US | 2 | Miwok 100km 2023 (15.5 hours) |
| 110166 | Cabbage | Matthew | M | TN | US | 4 | No Business 100M 2023 (33.5 hours) |
| 118642 | CABEL | JORIS | M | France | FR | 1 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 110115 | Cabo Gil | Juan Antonio | M | Valencia | ES | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117172 | CABRIOLU | GIAN FRANCO | M | ITALIA | IT | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115152 | Cadart | Dorian | M | Haute Garonne | FR | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 108988 | Cadieux | Matthew | M | MA | US | 4 | Canal Corridor 100 100M 2023 (30 hours) |
| 118856 | Caesar | Renee | F | British Columbia | CA | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 102577 | Caffrey | Andrew | M | NY | US | 4 | Canal Corridor 100 100M 2023 (30 hours) |
| 108785 | Cahill | Anthony | M | Dublin | IE | 2 | Kerry Way Ultra 193km 2023 (40 hours) |
| 115231 | Cahill | Michael | M | Queensland | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 112352 | Cai | Charles | M | CA | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 105713 | Cai | Hong | M | CHN | CN | 2 | Hong Kong 100K 100km 2023 (23 hours) |
| 113023 | Cain | David | M | Tennessee | US | 2 | Zion 100km 2023 (19 hours) |
| 116934 | Caissie | Josette | F | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 116830 | caissie | lisette | F | British Columbia | CA | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 104237 | Caldecourt | Peter | M | WI | US | 8 | Hennepin 100M 2023 (30 hours) |
| 104661 | Calder | Phil | M | NZL | NZ | 16 | Tarawera 100M 100M 2023 (36 hours) |
| 115287 | Caldera | Javier | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 104714 | Calimano | Chris | M | NY | US | 128 | Eastern States 100M 2023 (36 hours) |
| 110675 | Calitz | Pieter | M | Western Cape | ZA | 4 | Karkloof 100M 2023 (36 hours) |
| 117690 | Callahan | Aidan | M | California | US | 1 | Quicksilver 100km 2023 (17 hours) |
| 101854 | Callahan | Bob | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 117532 | Callahan | Brandon | M | La | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 112793 | Callaway | Gabe | M | OR | US | 2 | Tahoe 200 202M 2023 (100 hours) |
| 118395 | Callaway | Keith | M | Or | US | 1 | Brazos Bend 100M 2022 (30 hours) |
| 117735 | CALMELS | stephan | M | Hérault | FR | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 112188 | Calvert | Benjamin | M | California | US | 2 | Zion 100M 2023 (36 hours) |
| 111596 | Calvert | Howard | M | Hampshire | GB | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104485 | Calvert | Renee | F | PA | US | 4 | Massanutten 100M 2023 (36 hours) |
| 116427 | Calvo Rubio | Jesus | M | Valencia | US | 1 | Ultra Trail Bosques del Sur 106km 2023 (22 hours) |
| 104010 | Calzetta | Christopher | M | CA | US | 8 | Mountain Lakes 100M 2023 (30 hours) |
| 114876 | Camarena | James | M | NC | US | 1 | Burning River 100M 2023 (30 hours) |
| 110160 | Cambier | Pascal | M | Luxemburg | BE | 2 | Trail Verbier St Bernard by UTMB 140km 2023 (40 hours) |
| 102384 | Camenisch | Thomas | M | CHE | CH | 1 | Western States 100M 2023 (30 hours) |
| 111598 | Cameron | Ben | M | Wairarapa | NZ | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 115413 | Cameron | Dale | M | Queensland | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 103370 | Cameron | Emilia | F | WI | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 112261 | Cameron | Kyle | M | Pa | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 116861 | Caminiti | Alexandra | F | Georgia | US | 1 | Grindstone 100km 2023 (18 hours) |
| 102212 | Campa | Matjaz | M | SVN | SI | 64 | Julian Alps Trail Run by UTMB 106km 2023 (24 hours) |
| 103631 | Campanella | Cassy | F | GA | US | 2 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 117056 | Campbell | Aaron | M | Canterbury | NZ | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 101898 | Campbell | Dan | M | MT | US | 32 | Beaverhead 100km 2023 (20 hours) |
| 115302 | Campbell | David | M | TAS | AU | 1 | Guzzler Ultra 100km 2023 (24 hours) |
| 102816 | Campbell | Kevin | M | TN | US | 16 | No Business 100M 2023 (33.5 hours) |
| 118486 | Campbell | Logan | M | ID | US | 1 | Beaverhead 100km 2023 (20 hours) |
| 104124 | Campbell | Matt | M | WA | US | 4 | San Diego 100M 2023 (32 hours) |
| 119122 | Campbell | Ryan | M | WV | US | 1 | Rim to River 100M 2023 (32 hours) |
| 106729 | Campbell | Stephanie | F | 4 | Indiana 100M 2023 (30 hours) | ||
| 112393 | Campbell | Stephen | M | AR | US | 2 | Arkansas Traveler 100M 2023 (30 hours) |
| 111754 | Campbell | Steven | M | VA | US | 2 | Hellgate 100km 2022 (17 hours) |
| 111879 | Campo | Simon | M | California | US | 2 | Quicksilver 100km 2023 (17 hours) |
| 106568 | Campos | Alberto | M | Michoacan | MX | 4 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 116614 | Campos | Maria | F | New Jersey | US | 1 | Laurel Highlands 70.5M 2023 (20 hours) |
| 118746 | Campos | Rowell | M | La Union | PH | 1 | Hardcore Hundred 100M 2023 (40 hours) |
| 115736 | Campos | Roy | M | WI | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 115840 | Candelaria | Carlos | M | NC | US | 1 | Umstead 100M 2023 (30 hours) |
| 118751 | Candelaria | Linus | M | Colorado | US | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 117522 | Candra | Sianti | F | DKI Jakarta | ID | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 110719 | Canessa | Alberto | M | Italia | IT | 4 | Trail Verbier St Bernard by UTMB 140km 2023 (40 hours) |
| 101534 | Canfield | Meghan | F | OR | US | 2 | Siskiyou Outback 100km 2023 (17 hours) |
| 100972 | Cannaday | Kevin | M | CO | US | 128 | High Lonesome 100M 2023 (37 hours) |
| 115510 | Canner | Samuel | M | MD | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 114256 | Canning | Joshua | M | AZ | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 109337 | Cannon | Jeff | M | CA | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 104358 | Cantrell | Matt | M | IN | US | 8 | Mohican 100M 2023 (32 hours) |
| 100368 | Canty | Liz | F | AL | US | 4 | Never Summer 103km 2023 (23 hours) |
| 115546 | Cao | Bofei | M | Ontario | CA | 1 | Black Canyon 100km 2023 (17 hours) |
| 113304 | Caon | Filippo | M | Trento | IT | 2 | Leadville Trail 100M 2023 (30 hours) |
| 118492 | CAP | Etienne | M | Brittany | FR | 1 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 118435 | Capecchi | William | M | WI | US | 1 | Zion 100M 2023 (36 hours) |
| 104622 | Capel | Jenny | F | NV | US | 8 | Bighorn 100M 2023 (35 hours) |
| 105795 | Capili | Aleksis | M | PHL | PH | 1 | Western States 100M 2023 (30 hours) |
| 115151 | Capili | Harry | M | Agusan Del Sur | PH | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 117692 | Capulong | Bernard | M | MT | US | 1 | Bighorn 100M 2023 (35 hours) |
| 114839 | Carberry | John | M | CO | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 118262 | Carboni jr | Sirlesio | M | Rio Grande do Sul | BR | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 118749 | Cardeano | Joao | M | Alberta | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 104014 | Cardenas | Adam | M | Lima | PE | 16 | Patagonia 112km 2023 (27 hours) |
| 112532 | Cardenas | Jose | M | Virginia | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 117641 | Cardenas | Suzanne | F | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 109118 | Cardin | Elliot | M | Quebec | CA | 2 | Black Canyon 100km 2023 (17 hours) |
| 115955 | Cardoze | Rodrigo | M | Panama | PA | 1 | Miwok 100km 2023 (15.5 hours) |
| 105975 | Caren | Neal | M | NC | US | 8 | No Business 100M 2023 (33.5 hours) |
| 112066 | Carey | Greg | M | NY | US | 2 | Grindstone 100M 2023 (38 hours) |
| 106219 | Carey | Jack | M | LA | US | 8 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 107851 | Carey | Jordan | M | Oregon | US | 2 | Gorge Waterfalls 100km 2023 (17 hours) |
| 114829 | Carey | Mark | M | ON | CA | 1 | Quebec Mega Trail 100M 2023 (40 hours) |
| 107450 | Carl | Samantha | F | WA | US | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 113111 | Carlevaro | Eugenio | N | PR | IT | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 101348 | Carlson | Alex | M | CO | US | 8 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 117359 | Carlson | Gregg | N | UT | US | 1 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 117388 | Carmel | Kim | F | WA | US | 1 | Cascade Crest 100M 2023 (35 hours) |
| 116182 | Carminati | Daniele | M | Italy | IT | 1 | Gran Trail Courmayeur 100km 2023 (28 hours) |
| 118667 | Carnes | Skylar | M | KS | US | 1 | Zion 100km 2023 (19 hours) |
| 117264 | Carney | Joe | M | TN | US | 1 | Zion 100M 2023 (36 hours) |
| 111632 | Carney | Samantha | F | PA | US | 2 | Rim to River 100M 2023 (32 hours) |
| 117956 | CAROBOLANTE | SILVIA | F | ITALIA | IT | 1 | Ultra Trail Vipava Valley 106km 2023 (25 hours) |
| 116772 | Caron | Frederick | M | Quebec | CA | 1 | Quebec Mega Trail 110km 2023 (22 hours) |
| 100971 | Carr | Michael | M | ON | CA | 2 | Cocodona 250M 2023 (125 hours) |
| 100899 | Carr | Steven | M | AL | US | 128 | Massanutten 100M 2023 (36 hours) |
| 113816 | Carr | Taylor | M | OR | US | 2 | Cascade Crest 100M 2023 (35 hours) |
| 106102 | Carroll | Anne | F | FL | US | 16 | Canal Corridor 100 100M 2023 (30 hours) |
| 115450 | Carroll | Crystal | F | Iowa | US | 1 | Hennepin 100M 2023 (30 hours) |
| 101307 | Carroll | Donal | M | NY | US | 1 | Western States 100M 2023 (30 hours) |
| 112251 | Carroll | Joe | M | OR | US | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 110667 | Carroll | Joshua | M | Illinois | US | 2 | Hennepin 100M 2023 (30 hours) |
| 117861 | Carroll | Megan | F | CA | US | 1 | Quicksilver 100km 2023 (17 hours) |
| 111838 | Carroll | Ryan | M | Massachusetts | US | 2 | HOKA Bandera 100km 2023 (17 hours) |
| 100805 | Carroll | Tom | M | IL | US | 8 | No Business 100M 2023 (33.5 hours) |
| 115868 | Carsky | Katie | F | NY | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 116993 | Carson | Gregory | M | BC | CA | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 112445 | Carson | Kevin | M | CO | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 101213 | Carter | Colton | M | CA | US | 8 | Cuyamaca 100km 2023 (17 hours) |
| 102080 | Carter | Deron | M | OR | US | 32 | Cascade Crest 100M 2023 (35 hours) |
| 100617 | Carter | Jonathan | M | CA | US | 8 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 115500 | Carter | Nick | M | TN | US | 1 | Grindstone 100M 2023 (38 hours) |
| 115753 | Carter | Scott | M | GA | US | 1 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 118982 | Carter | Sophie | F | OXFORDSHIRE | US | 1 | Race to the Stones 100km 2023 (17 hours) |
| 115964 | Carter | Stefanie | F | WI | US | 1 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 104195 | Carter (Heuser) | Emily | F | NC | US | 8 | Cruel Jewel 106M 2023 (48 hours) |
| 110072 | Cartier | Nathan | M | CA | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 116112 | Cartwright | Jack | M | Colorado | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 117057 | Carvajal | Alex | M | Mexico | MX | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 111340 | Carver | David | M | TN | US | 2 | Zion 100km 2023 (19 hours) |
| 117763 | Casas Gimeno | Ester | F | Catalunya | ES | 1 | Trail 100 Andorra by UTMB 105km 2023 (30 hours) |
| 117262 | Cascarina | David | M | Bridgend | GB | 1 | Race to the Stones 100km 2023 (17 hours) |
| 117095 | Case | Desirae | F | MI | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 108561 | casey | Clark | M | CA | US | 4 | Quicksilver 100km 2023 (17 hours) |
| 118973 | Casey | Jack | M | Devon | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 109740 | Casey | Luke | M | Montana | US | 4 | Beaverhead 100km 2023 (20 hours) |
| 111975 | Cashbaugh | Dylan | M | CA | US | 2 | Umstead 100M 2023 (30 hours) |
| 104276 | Casper-Shipp | Magdalena | F | IL | US | 2 | Tunnel Hill 100M 2022 (30 hours) |
| 116453 | Cassaigne | Cyril | M | Paris | FR | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 104664 | Cassan | Stefano | M | ITA | IT | 1 | Western States 100M 2023 (30 hours) |
| 101882 | Cassano | Andrew | M | NV | US | 8 | HURT 100M 2023 (36 hours) |
| 109203 | Cassel | Joachim | M | London | GB | 4 | Eiger Ultra Trail 101km 2023 (23 hours) |
| 117061 | Cassidy | Rowan | M | Qld | US | 1 | Guzzler Ultra 100km 2023 (24 hours) |
| 113867 | Cassity | Gary | M | TX | US | 2 | Arkansas Traveler 100M 2023 (30 hours) |
| 117683 | Casson | Zachary | M | Oregon | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 118774 | Castaneda | Kevin | M | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 117469 | Castanelli | Damian | M | Vic | AU | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 116738 | Castellanos | Jaime | M | California | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 102915 | Castello Branco | Alexandre | M | RJ | BR | 64 | Brazil 135 135M 2023 (120 hours) |
| 117205 | CASTELLO NORIA | FRANCESC | M | Catalunya | ES | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104000 | Castignola | Demetrio | M | ITA | IT | 16 | Black Canyon 100km 2023 (17 hours) |
| 112473 | Castillo | Franklin | M | Panama | PA | 2 | Black Canyon 100km 2023 (17 hours) |
| 108072 | Castillo | Maria | F | Texas | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 116788 | Castillo | Nathan | M | Il | US | 1 | Indiana 100M 2023 (30 hours) |
| 112060 | Castle | Drew | M | CA | US | 2 | Cocodona 250M 2023 (125 hours) |
| 101219 | Castonguay | David | M | QC | CA | 16 | Quebec Mega Trail 100M 2023 (40 hours) |
| 116954 | Castrejon | Jonathan | M | UT | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 113503 | Castres | Deborah | F | NSW | AU | 2 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 116075 | Castro | Andrea | F | WA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 117396 | Castro Valenzuela | Ignacio | M | Baja California | MX | 1 | San Diego 100M 2023 (32 hours) |
| 103461 | Catanglan | Lexie | F | CA | US | 8 | Quicksilver 100km 2023 (17 hours) |
| 118772 | Cate | Sean | M | VA | US | 1 | Hellgate 100km 2022 (17 hours) |
| 113702 | Cater | Marko | M | CA | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 109111 | Cates | Mary | F | Tennessee | US | 2 | Yeti (Virginia) 100M 2023 (30 hours) |
| 113858 | Cato | Chad | M | North Carolina | US | 2 | Fat Dog 120M 2023 (48 hours) |
| 117863 | catozi | ADRIANO | M | FR | IT | 1 | Morenic Trail 100km 2023 (22 hours) |
| 116841 | Cattarin | Nathan | M | Washington | US | 1 | Cascade Crest 100M 2023 (35 hours) |
| 110441 | Catti | Lorenzo | M | Italy | IT | 4 | Tuscany Crossing 160km 2023 (32 hours) |
| 105885 | Cauchon | Jean-François | M | QC | CA | 32 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 117346 | Caussarieu | Valery | M | Yvelines (78) | FR | 1 | Tor des Géants 330km 2023 (132 hours) |
| 118739 | cavallo | fabio | M | italia | IT | 1 | Tuscany Crossing 103km 2023 (21 hours) |
| 103076 | Cavallo | Giuseppe | M | PA | US | 64 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 101621 | Cavanaugh | Brian | M | MI | US | 1 | Western States 100M 2023 (30 hours) |
| 108198 | Cavanaugh | Mike | M | Wisconsin | US | 2 | HOKA Bandera 100km 2023 (17 hours) |
| 105405 | Cavanough | Shaun | M | AUS | AU | 4 | Kosciusko by UTMB 100M 2022 (36 hours) |
| 117597 | Cavill | Kimberley | F | North Yorkshire | GB | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 113153 | Cawthorne | Alex | M | Oxfordshire | GB | 2 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 107413 | Cazorla | Julien | M | London | GB | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 114276 | Ceballos | Maydelene | F | QLD | AU | 2 | Guzzler Ultra 100km 2023 (24 hours) |
| 118506 | Ceh | Rick | M | IL | US | 1 | Hennepin 100M 2023 (30 hours) |
| 101868 | Celaya | Brian | M | CA | US | 8 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 115051 | Celli | Stefano | M | Italy | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 114899 | Cerna | Kristyna | F | Czech Republic | CZ | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 116940 | Cerra | Joshua | M | Wisconsin | US | 1 | Hennepin 100M 2023 (30 hours) |
| 103855 | Cervantes | Jose | M | ID | US | 64 | Run Rabbit Run 100M 2023 (36 hours) |
| 118096 | Cesolini | Tony | M | Colorado | US | 1 | Never Summer 103km 2023 (23 hours) |
| 112724 | Cha | Youngok | F | Chibaken | JP | 2 | Istria by UTMB 110km 2023 (24 hours) |
| 115666 | Chacartegui | Antone | M | ID | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 112436 | Chacon | Jose | M | Ca | US | 2 | Rio Del Lago 100M 2023 (30 hours) |
| 114776 | Chacon | Robert | M | IL | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 118342 | Chacon Salas | Luis Carlos | M | San Jose | CR | 1 | Val d'Aran by UTMB, Camins de Hèr 105km 2023 (26 hours) |
| 109864 | Chafkin | Max | M | NY | US | 4 | Cruel Jewel 106M 2023 (48 hours) |
| 117565 | Chagovets | Oleksiy | M | Dnipro | UA | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 102698 | Chahl | Tara | F | AB | CA | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 101803 | Chalk | Darren | M | GBR | GB | 1 | Western States 100M 2023 (30 hours) |
| 115847 | Chaloupka | Vaclav | M | NC | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 115376 | chamberland | genevieve | F | Québec | CA | 1 | Zion 100km 2023 (19 hours) |
| 102481 | Chamberlin | Chris | M | WA | US | 4 | Cascade Crest 100M 2023 (35 hours) |
| 116368 | Chambers | Nathan | M | WA | US | 1 | Cascade Crest 100M 2023 (35 hours) |
| 102526 | Chambers | Pete | M | OR | US | 8 | Mountain Lakes 100M 2023 (30 hours) |
| 105532 | Chamoun | Michael | M | CA | US | 8 | Wasatch Front 100M 2023 (36 hours) |
| 116925 | Champ | Jenny | F | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 117494 | Chan | Kimberly | F | BC | CA | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 115676 | Chan | Nathaniel | M | AZ | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 117892 | Chan | Shermayne | F | NSW | AU | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 103158 | Chan | Wayne | M | MA | US | 32 | Grindstone 100M 2023 (38 hours) |
| 108397 | Chaney | Mather | M | AR | US | 4 | Arkansas Traveler 100M 2023 (30 hours) |
| 105708 | Chang | Jordan | M | VA | US | 1 | Western States 100M 2023 (30 hours) |
| 118028 | Chang | Kristina | F | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 114003 | Chankseliani | Larissa | F | ON | CA | 2 | Quebec Mega Trail 100M 2023 (40 hours) |
| 118919 | Chao | Tzu Hsien | M | Taipei | TW | 1 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 116470 | Chapdelaine | Connor | M | IL | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 107351 | chapman | alan | M | mn | US | 4 | Kettle Moraine 100M 2023 (30 hours) |
| 115880 | Chapman | Brett | M | Florida | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 117008 | Chapman | Dan | M | OR | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 109169 | Chapman | Joshua | M | Indiana | US | 2 | Gorge Waterfalls 100km 2023 (17 hours) |
| 107503 | Chapman | Peter | M | DC | US | 4 | Grindstone 100M 2023 (38 hours) |
| 119041 | Chapman | Ryan | M | WI | US | 1 | Trail 100 Andorra by UTMB 105km 2023 (30 hours) |
| 108686 | Chapman | Tyler | M | BC | CA | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116568 | Chappell | Bennett | M | IL | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 100287 | Chapple | Baden | M | AUS | AU | 2 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 118720 | Charlson | Thomas | M | WA | US | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 117149 | Charlston | Will | M | Victoria | AU | 1 | Surf Coast Century 100km 2023 (16 hours) |
| 114374 | Charmoz | Alex | M | CA | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 111751 | Chartier | Chris | M | OH | US | 2 | Mohican 100M 2023 (32 hours) |
| 101360 | Chase | David | M | CA | US | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 119081 | Chase | Holly | F | DC | US | 1 | Umstead 100M 2023 (30 hours) |
| 117046 | Chase | Zander | M | Washington | US | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 110538 | Chatzis | Athanasios | M | Greece | GR | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 114786 | Chavan | Ramesh | M | NV | US | 1 | Zion 100M 2023 (36 hours) |
| 115865 | Chaves | Ruben | M | Lisbon | PT | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 102939 | Chavez | Amy | F | CA | US | 16 | Javelina Jundred 100M 2023 (30 hours) |
| 101943 | Chavez | Anthony | M | CA | US | 4 | Siskiyou Outback 100km 2023 (17 hours) |
| 117633 | Chavez | Damon | M | UT | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 116810 | Chavez | Jocelyn | F | New Mexico | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 107834 | Chavez | Michael | M | Colorado | US | 4 | Run Rabbit Run 100M 2023 (36 hours) |
| 109981 | Cheatham | Scott | M | VA | US | 2 | Yeti (Virginia) 100M 2023 (30 hours) |
| 118212 | Cheatwood | Garrett | M | Alabama | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 104018 | Cheechov | Ron | M | OR | US | 16 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 106740 | Cheetham | Gregg | M | Gauteng | ZA | 2 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 115381 | Chekal | lori | F | MA | US | 1 | Long Haul 100M 2023 (30 hours) |
| 108402 | Chen | Gang | M | CA | US | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 113397 | chen | peng chung | M | 苗栗縣 | TW | 2 | Ultra Tour Monte Rosa 170km 2023 (60 hours) |
| 100841 | Chen | Ying | M | CA | US | 16 | Miwok 100km 2023 (15.5 hours) |
| 100989 | Chen | Yong Chuang | M | BC | CA | 16 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116319 | Chen-Luftig | Lucia | F | California | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 100288 | Cheng | Yuanchao | M | AUS | AU | 64 | Surf Coast Century 100km 2023 (16 hours) |
| 117152 | cheng | yuchao | M | Zhejiang | CN | 1 | Ninghai Ultra Trail 109km 2023 (24 hours) |
| 101040 | Chenier | Jean-Mathieu | M | QC | CA | 2 | Zion 100M 2023 (36 hours) |
| 101180 | Cheong | Terry | M | MAC | MO | 4 | Wasatch Front 100M 2023 (36 hours) |
| 107501 | Chernowski | Joseph | M | GA | US | 4 | Pinhoti 100M 2023 (31 hours) |
| 101660 | Chervyakov | Alexander | M | RUS | RU | 1 | Western States 100M 2023 (30 hours) |
| 108286 | Cheshire | Ellen | F | UT | US | 2 | Zion 100M 2023 (36 hours) |
| 118161 | Chessex | Vincent | M | Vaud | CH | 1 | Ultra Tour Monte Rosa 170km 2023 (60 hours) |
| 118182 | Chesterman | Glen | M | Hawkes Bay | NZ | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 101443 | Cheung | Kashing | M | HKG | HK | 8 | Transjeju International Trail Run 112km 2023 (27 hours) |
| 119040 | Cheung | Man Ho | M | Hong Kong | HK | 1 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 100076 | Cheung | Wilson | M | HKG | HK | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118317 | Chew | David | M | Colorado | US | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118921 | Chiang | Lu-Chung | M | Taoyuan | TW | 1 | Formosa Trail 104km 2022 (28 hours) |
| 103362 | Chiaramonte | Jasmine | F | PA | US | 16 | Burning River 100M 2023 (30 hours) |
| 100944 | Chiasson | Hailey | F | CA | US | 16 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 118631 | Chick | Michael | M | OH | US | 1 | Burning River 100M 2023 (30 hours) |
| 113560 | chico | luis javier | M | catalunya | ES | 2 | West Highland Way 95M 2023 (30 hours) |
| 101370 | Chidester | Jason | M | GA | US | 16 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 106518 | Chieh | Baldwyn | M | CA | US | 16 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 102227 | Chiknavaryan | Stanislav | M | WA | US | 8 | Grindstone 100M 2023 (38 hours) |
| 116704 | Chilcote | Matthew | M | Ohio | US | 1 | Mohican 100M 2023 (32 hours) |
| 118860 | Childers | Casey | M | Colorado | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 117418 | Childs | Carissa | F | NY | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 112437 | Childs | Mike | M | NY | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 117833 | Chin | Wei Chong | M | Singapore | SG | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117535 | Ching | Flora wing yee | F | Hk | HK | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118213 | CHIONG | BILL CARLO | M | MISAMIS ORIENTAL | PH | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 109339 | Chirgwin | Natalie | F | OR | US | 4 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 118119 | Chirhart | Luke | M | Illinois | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 117463 | Chirita | Liviu | M | Czech Republic | CZ | 1 | Swiss Alps 100M 2023 (49 hours) |
| 114817 | Chirnside | Iain | M | London | GB | 1 | Race to the Stones 100km 2023 (17 hours) |
| 113176 | chis | ioan daniel | M | cluj | RO | 2 | Restonica Trail by UTMB - Ultra-Trail® di Corsica 110km 2023 (36 hours) |
| 114262 | Chisholm | Paul | M | SD | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 101900 | Chisholm | Paul | M | ON | CA | 8 | Bigfoot 206M 2023 (100 hours) |
| 108843 | Chittenden | Stuart | M | Surrey | GB | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 102893 | Chiu | Daniella | F | GBR | GB | 2 | Autumn 100M 2023 (28 hours) |
| 115061 | Chiu | Sebastian | M | NY | US | 1 | Grindstone 100M 2023 (38 hours) |
| 116507 | Chmielewski | Max | M | WA | US | 1 | Siskiyou Outback 100km 2023 (17 hours) |
| 118339 | Cho | JaeBum | M | Song pa | KR | 1 | Transjeju International Trail Run 112km 2023 (27 hours) |
| 102104 | Cho | Yung Hae | F | OR | US | 64 | Waldo 100km 2023 (18 hours) |
| 112434 | Choe | Terri | F | California | US | 2 | Quicksilver 100km 2023 (17 hours) |
| 119132 | Choi | Justin Ryan | M | NY | US | 1 | Transjeju International Trail Run 112km 2023 (27 hours) |
| 109347 | Chojnicki | Bartosz | M | Wielkopolska | PL | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116870 | Chong | Mi Chin | F | Sarawak | MY | 1 | Vietnam Mountain Marathon 100km 2023 (27 hours) |
| 110458 | CHOPPE | YANN | M | Quebec | CA | 4 | Canyons by UTMB 100km 2023 (18 hours) |
| 116063 | Chorey | Timothy | M | CA | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 101624 | Chow | Kevin | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 116567 | Christau | Stephanie | F | MA | US | 1 | Never Summer 103km 2023 (23 hours) |
| 113826 | Christen | Neal | M | CA | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 107574 | Christensen | Andrea | F | UT | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 116123 | Christensen | Brendan | M | MT | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 117227 | Christensen | Dakota | M | Ontario | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 104602 | Christensen | Garret | M | DC | US | 1 | Western States 100M 2023 (30 hours) |
| 114403 | christensen | leif | M | South Australia | AU | 2 | Blackall 100K 100km 2023 (18 hours) |
| 116808 | Christian | Matthew | M | Isle of Man | GB | 1 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 117010 | Christie | Monty | M | Saskatchewan | CA | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104878 | Christman | Eric | M | PA | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 106655 | Christophersen | Mikkel | M | DNK | DK | 8 | Javelina Jundred 100M 2023 (30 hours) |
| 104072 | Christopherson | David | M | UT | US | 8 | Bear, The 100M 2023 (36 hours) |
| 114549 | Christopherson | Mark | M | Utah | US | 2 | Bear, The 100M 2023 (36 hours) |
| 118286 | Chrysler | Andrew | M | ID | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 116709 | Chrzuszcz | Anna | F | Gorzów wielkopolski | PL | 1 | Julian Alps Trail Run by UTMB 106km 2023 (24 hours) |
| 117453 | Chu | Yat Him | M | BC | CA | 1 | Ultra-Trail Cape Town 100km 2022 (21 hours) |
| 112040 | Chung | Clement | M | New York | US | 2 | Canal Corridor 100 100M 2023 (30 hours) |
| 103758 | Chung | Hyun Chang | M | HKG | HK | 32 | Doi Inthanon Thailand by UTMB 100M 2022 (48 hours) |
| 112896 | Chung | John | M | Tasmania | AU | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118742 | Chung | Tsz Man | F | Hong Kong | HK | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117715 | Churchill | Andrew | M | London | US | 1 | Autumn 100M 2023 (28 hours) |
| 118308 | Churchill | Mary | F | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 115861 | Chutter | Stuart | M | SK | CA | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 109925 | Ciabarri | Michele | M | Sondrio | IT | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 109851 | Cibulka | Jeramia | M | Colorado | US | 4 | Never Summer 103km 2023 (23 hours) |
| 116172 | Ciccia | Jose Juan | M | Piura | PE | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 109282 | Ciccomascolo | Lauren | F | California | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 103660 | Ciclitira | Simone | M | ITA | IT | 1 | Western States 100M 2023 (30 hours) |
| 101663 | Cienciala | Jerzy | M | CZE | CZ | 2 | Ultra Trail Vipava Valley 106km 2023 (25 hours) |
| 116462 | Cierpial | Zachary | M | Florida | US | 1 | Swiss Alps 100km 2023 (22 hours) |
| 116276 | Cieslar | Jakub | M | 09148087 | CZ | 1 | Javornicka 105km 2023 (24 hours) |
| 101030 | Cissel | Shawn | M | MD | US | 16 | Tunnel Hill 100M 2022 (30 hours) |
| 116883 | Citarella | Dominic | M | British Columbia | CA | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 102575 | Ciuchta | Brian | M | CA | US | 16 | San Diego 100M 2023 (32 hours) |
| 104089 | Cizio | Greg | M | CA | US | 8 | Cuyamaca 100km 2023 (17 hours) |
| 108539 | Claassen | Daniel | M | Western Cape | ZA | 4 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 110082 | Claflin | Elizabeth | F | CO | US | 4 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 117575 | CLAMONS | Arnaud | M | HAUTE VIENNE | FR | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 117652 | Clamp | John | M | Arkansas | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 111270 | Clamp | Lacey | F | Arkansas | US | 2 | Arkansas Traveler 100M 2023 (30 hours) |
| 118808 | Clancy | Kevin | M | California | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 117827 | Clare | Daniel | M | NSW | AU | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 107906 | clark | alan | M | Middlesex | GB | 2 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 115556 | Clark | Alyssa | F | California | US | 1 | Canyons by UTMB 100M 2023 (32 hours) |
| 100348 | Clark | Amy | F | TX | US | 32 | Black Canyon 100km 2023 (17 hours) |
| 105709 | Clark | Andrew | M | CA | US | 16 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 100089 | Clark | Ben | M | AUS | AU | 64 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 100594 | Clark | Blane | M | TN | US | 2 | Tunnel Hill 100M 2022 (30 hours) |
| 118359 | Clark | Brandon | M | OH | US | 1 | Burning River 100M 2023 (30 hours) |
| 117379 | Clark | Chuck | M | TX | US | 1 | Burning River 100M 2023 (30 hours) |
| 116200 | Clark | Crystal | F | Ohio | US | 1 | Umstead 100M 2023 (30 hours) |
| 107542 | Clark | Daniel | M | England | GB | 2 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 114112 | Clark | James | M | WA | US | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 117408 | Clark | Jeff | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 108338 | Clark | Mike | M | AZ | US | 4 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 116469 | Clark | Nick | M | MI | US | 1 | Indiana 100M 2023 (30 hours) |
| 118674 | Clark | Skye | M | Western Province | ZA | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 110318 | Clark | Stephen | M | Zurich | CH | 2 | Trail Verbier St Bernard by UTMB 140km 2023 (40 hours) |
| 104001 | Clark | Trey | M | AL | US | 16 | Pinhoti 100M 2023 (31 hours) |
| 103056 | Clark | Wendy | F | UT | US | 8 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 114653 | Clark | William | M | OK | US | 1 | Brazos Bend 100M 2022 (30 hours) |
| 111528 | Clarke | Alan | M | UK | GB | 2 | South Downs Way 100M 2023 (30 hours) |
| 104626 | Clarke | Brody | M | AUS | AU | 2 | Tarawera 100K 102km 2023 (17 hours) |
| 115066 | Clarke | Karen | F | Pennsylvania | US | 1 | Indiana 100M 2023 (30 hours) |
| 107932 | Clarke | Liz | F | CA | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 118927 | Clarke | Nicole | N | NC | US | 1 | Umstead 100M 2023 (30 hours) |
| 116712 | Clarke | Paul | M | Hertfordshire | US | 1 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 118230 | Clarke | Sam | M | Auckland | NZ | 1 | Taupo 100k 100km 2023 (17 hours) |
| 105123 | Clause | Tamara | F | AZ | US | 4 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 105106 | Clay | Emily | F | MD | US | 32 | Morenic Trail 100km 2023 (22 hours) |
| 113619 | Clay | Holden | M | california | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 108449 | Clay | Jennifer | F | Surrey | GB | 2 | Val d'Aran by UTMB, Camins de Hèr 105km 2023 (26 hours) |
| 112336 | Clayton | Ben | M | KY | US | 2 | Tahoe 200 202M 2023 (100 hours) |
| 117843 | Clayton | Jonathan | M | NC | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 106182 | Clayton | Ryan | M | IN | US | 32 | Indiana 100M 2023 (30 hours) |
| 109125 | Clayton | Seth | M | MI | US | 4 | Superior 100 100M 2023 (38 hours) |
| 116802 | Clem | Alex | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 110280 | Clemens | Lindsey | F | GA | US | 4 | San Diego 100M 2023 (32 hours) |
| 116186 | Clemens | Rob | M | BC | CA | 1 | Lost Soul Ultra 100km 2023 (21 hours) |
| 111536 | Clement | Antoine | M | France | FR | 2 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 111198 | CLEMENT | OLIVIER | M | Région PACA | FR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 114020 | Clements | Bill | M | CA | US | 2 | Waldo 100km 2023 (18 hours) |
| 116456 | Clements | Ed | M | Somerset | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 112486 | Clements | Tyler | M | Washington | US | 2 | Cascade Crest 100M 2023 (35 hours) |
| 113761 | Clemons | Andrea | F | Antananarivo | MG | 2 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 117674 | Clemons | Damian | M | NY | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 118517 | Clemons | Genevieve | F | TX | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 112018 | Clemons | Makai | M | CA | US | 2 | San Diego 100M 2023 (32 hours) |
| 102671 | Cleveland | Andy | M | ID | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 100873 | Clews | Charlotte | F | ME | US | 16 | Twisted Branch 100km 2023 (20 hours) |
| 118183 | Clifton | Nathan | M | AZ | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 114688 | Cline | Alec | M | OH | US | 1 | Mohican 100M 2023 (32 hours) |
| 100967 | Clink | Andy | M | AZ | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 100807 | Clinthorne | Ashley | F | CO | US | 64 | Run Rabbit Run 100M 2023 (36 hours) |
| 100876 | Clinthorne | Jonathan | M | CO | US | 1 | Western States 100M 2023 (30 hours) |
| 115954 | Clinton | Rachel | F | PA | US | 1 | Grindstone 100km 2023 (18 hours) |
| 118648 | Clissold | James | M | Utah | US | 1 | Bear, The 100M 2023 (36 hours) |
| 119018 | Close | Gregory | M | NY | US | 1 | Grindstone 100km 2023 (18 hours) |
| 107908 | Cluff | Chelsea | F | NV | US | 4 | Rio Del Lago 100M 2023 (30 hours) |
| 111002 | Co | Annalisa | F | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 113863 | Coassolo | Juan Jose | M | Entre Rios | AR | 1 | Brazil 135 135M 2023 (120 hours) |
| 104248 | Cobbs | John | M | AL | US | 2 | Yeti (Virginia) 100M 2023 (30 hours) |
| 116843 | Cobos | David | M | Oregon | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 115320 | Coccia | Jacob | M | Virginia | US | 1 | Hellgate 100km 2022 (17 hours) |
| 115210 | Coccia | Jared | M | Virginia | US | 1 | Hellgate 100km 2022 (17 hours) |
| 102632 | Cochou | Pierre | M | NCL | NC | 1 | Western States 100M 2023 (30 hours) |
| 111389 | Cochrane | Simon | M | WaikatoTasman | NZ | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 100547 | Cody | Ryan | M | NM | US | 8 | HOKA Bandera 100km 2023 (17 hours) |
| 113529 | Coe | Jodine | F | ID | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 111247 | Coelho | Marco | M | MN | US | 2 | Superior 100 100M 2023 (38 hours) |
| 104897 | Coen | Andy | M | NE | US | 8 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 116775 | Coen | Brad | M | Colorado | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 112977 | Coffey | Ethan | M | TN | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 113939 | Coffman | Hunter | M | CA | US | 2 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 114085 | Cohen | David | M | CA | US | 2 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 110548 | Cohen | Mitchell | M | CO | US | 4 | Run Rabbit Run 100M 2023 (36 hours) |
| 113534 | Cohen | Sam | M | DC | US | 1 | Western States 100M 2023 (30 hours) |
| 118406 | Coholan | Gregory | M | North Carolina | US | 1 | Grindstone 100M 2023 (38 hours) |
| 118647 | COINTREL PORZUCEK | Aline | F | Île-de-France | FR | 1 | Transjeju International Trail Run 112km 2023 (27 hours) |
| 117973 | Cojti Ren | Ali | F | ON | US | 1 | Indiana 100M 2023 (30 hours) |
| 115582 | COLBERT | ANDY | N | IL | US | 1 | Hennepin 100M 2023 (30 hours) |
| 112337 | Cole | Connor | M | CA | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 115590 | Cole | Grant | M | PA | US | 1 | Eastern States 100M 2023 (36 hours) |
| 112212 | Cole | Laura | F | FL | US | 2 | Long Haul 100M 2023 (30 hours) |
| 108340 | Cole | Patrick | M | Colorado | US | 4 | No Business 100M 2023 (33.5 hours) |
| 107794 | Cole-Husseini | Jacqueline | F | NC | US | 4 | No Business 100M 2023 (33.5 hours) |
| 115439 | Colebatch | Lachan | M | Victoria | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 104201 | Coleman | Jason | M | MO | US | 8 | Bear, The 100M 2023 (36 hours) |
| 115216 | Coleman | Kaden | M | UT | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 111845 | Coleman | Kevin | M | Minnesota | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 117231 | Coleman | Martin | M | ON | CA | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 113998 | Coleman | Sutton | M | AL | US | 2 | No Business 100M 2023 (33.5 hours) |
| 116493 | Coleman | Tim | M | Ontario | CA | 1 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 111284 | Coles | Michael | F | North West | ZA | 2 | Ultra-Trail Cape Town 100M 2022 (45 hours) |
| 117015 | Coli | Andrew | M | CA | US | 1 | Fat Dog 120M 2023 (48 hours) |
| 115361 | Coll | Jerry | M | Cheshire | GB | 1 | Lakeland 100M 2023 (40 hours) |
| 118853 | collados | Javier | M | Valencia | US | 1 | Penyagolosa 115km 2023 (26 hours) |
| 103348 | Collar | Natalie | F | CO | US | 8 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 116612 | Colley | Shannon | F | NC | US | 1 | Wasatch Front 100M 2023 (36 hours) |
| 107391 | Collier | Chris | M | California | US | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 103384 | Collin | Mat | M | AUS | AU | 32 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 110810 | Collins | Chuck | M | MO | US | 4 | Crazy Mountain 100M 2023 (36 hours) |
| 117266 | Collins | Eric | M | CT | US | 1 | Bighorn 100M 2023 (35 hours) |
| 115962 | Collins | Jameson | M | Oregon | US | 1 | Moab 238M 2023 (106 hours) |
| 105969 | Collins | Matt | M | NY | US | 16 | Tunnel Hill 100M 2022 (30 hours) |
| 103113 | Collins | Matt | M | CO | US | 4 | IMTUF 100M 2023 (36 hours) |
| 118391 | Collins | Paul | M | Kentucky | US | 1 | No Business 100M 2023 (33.5 hours) |
| 106746 | Collins | Pierre | M | QC | CA | 16 | Javelina Jundred 100M 2023 (30 hours) |
| 114492 | Collins | Samuel | M | UT | US | 2 | Gorge Waterfalls 100km 2023 (17 hours) |
| 118821 | Collins | Seth | M | OH | US | 1 | Mohican 100M 2023 (32 hours) |
| 101990 | Collins | Tabatha | F | WA | US | 32 | Oregon Cascades 100M 2023 (32:01:18) |
| 114245 | Colls Avila | Oscar | M | Girona | ES | 2 | Transgrancanaria 125km 2023 (28 hours) |
| 117808 | Colque | Christian | M | Cordoba | AR | 1 | Brazil 135 135M 2023 (120 hours) |
| 115960 | Colson | Micki | F | IL | US | 1 | Hennepin 100M 2023 (30 hours) |
| 118865 | Colton | Casey | M | OR | US | 1 | Mountain Lakes 100M 2023 (30 hours) |
| 117478 | Colton | Eric | M | OR | US | 1 | Waldo 100km 2023 (18 hours) |
| 114883 | Colwell | Sarah | F | Maryland | US | 1 | Hellgate 100km 2022 (17 hours) |
| 118515 | Comas | Felipe | M | BC | CA | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 113039 | Combs | Matthew | M | TX | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 110154 | Comi | Matt | M | AL | US | 4 | Bear, The 100M 2023 (36 hours) |
| 103800 | Compagnone | Brian | M | VA | US | 32 | Cascade Crest 100M 2023 (35 hours) |
| 109666 | Compan | Jennifer | F | WI | US | 4 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 114965 | Comparin | Paolo | M | VR | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 102412 | Composto | Nicolas | M | MT | US | 8 | Gorge Waterfalls 100km 2023 (17 hours) |
| 116050 | Compton | Cash | M | OR | US | 1 | Siskiyou Outback 100km 2023 (17 hours) |
| 108024 | Compton | Matthew | M | Ca | US | 2 | Georgia Death Race 74M 2023 (23 hours) |
| 116588 | Compton | Paul | M | Leicestershire | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 106747 | Conboy | Jess | M | IL | US | 4 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 102456 | Concannon | Christopher | M | CA | US | 32 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 114053 | Condella | Michael | M | mass | US | 2 | Tunnel Hill 100M 2022 (30 hours) |
| 105940 | Condon | Brian | M | CO | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 105636 | Condrati | Cesar | M | BRA | BR | 8 | Brazil 135 135M 2023 (120 hours) |
| 114204 | Congdon | Jeff | M | WA | US | 2 | Gorge Waterfalls 100km 2023 (17 hours) |
| 115603 | Congram | Ben | M | Ontario | CA | 1 | Quebec Mega Trail 110km 2023 (22 hours) |
| 101798 | Conley | Mark | M | RI | US | 4 | Twisted Branch 100km 2023 (20 hours) |
| 116250 | Connell | Brendan | M | Arkansas | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 112102 | Connell | Gaelan | M | British Columbia | CA | 2 | Siskiyou Outback 100km 2023 (17 hours) |
| 100517 | Conner | David | M | CO | US | 64 | No Business 100M 2023 (33.5 hours) |
| 107234 | Conner | William | M | CA | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 109825 | Conner | Yolanda | F | CA | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 101574 | Connolly | Nicholas | M | NV | US | 32 | Black Canyon 100km 2023 (17 hours) |
| 116223 | Connolly | Steven | M | Ca | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 112783 | Conrad | Alexander | M | California | US | 2 | Miwok 100km 2023 (15.5 hours) |
| 103047 | Conrad | Jacob | M | OH | US | 2 | Canal Corridor 100 100M 2023 (30 hours) |
| 112363 | Constable | Piers | M | NY | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 118170 | Constantino | Carlos | M | Oxfordshire | GB | 1 | Autumn 100M 2023 (28 hours) |
| 109305 | Conte | Julien | M | Quebec | CA | 2 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 105383 | Contesti | Toni | M | ESP | ES | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 111207 | Conti | Mike | M | Florida | US | 2 | Georgia Death Race 74M 2023 (23 hours) |
| 117974 | Contino | Robin | F | Maryland | US | 1 | Rim to River 100M 2023 (32 hours) |
| 115911 | convery | rebecca | F | MD | US | 1 | Massanutten 100M 2023 (36 hours) |
| 115796 | Conway | Jennifer | F | AB | US | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 114528 | Cook | Aaron | M | WI | US | 2 | Superior 100 100M 2023 (38 hours) |
| 118939 | Cook | Anne-Marie | F | NSW | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 101623 | Cook | Denis | M | ID | US | 1 | Western States 100M 2023 (30 hours) |
| 102059 | Cook | Kate | F | MA | US | 1 | Western States 100M 2023 (30 hours) |
| 102861 | Cook | Kelly | M | TX | US | 64 | HOKA Bandera 100km 2023 (17 hours) |
| 116478 | Cook | Matthew | M | TN | US | 1 | No Business 100M 2023 (33.5 hours) |
| 101468 | Cook | Sean | M | VA | US | 8 | Georgia Death Race 74M 2023 (23 hours) |
| 114687 | cooke | clare | F | North Island | US | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 117986 | Cooke | Jennifer | F | MD | US | 1 | Rim to River 100M 2023 (32 hours) |
| 107241 | Cooke | Marty | M | Idaho | US | 4 | Wasatch Front 100M 2023 (36 hours) |
| 110309 | Cooksey | Andy | M | Surrey | GB | 2 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 103090 | Coolman | Mindy | F | NE | US | 8 | Cocodona 250M 2023 (125 hours) |
| 115423 | Coombes | Drew | M | Nc | US | 1 | Umstead 100M 2023 (30 hours) |
| 118147 | Coon | Taelor | F | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 115271 | Cooney | Andrew | M | Berkshire | GB | 1 | Thames Path 100 100M 2023 (28 hours) |
| 117587 | Cooper | Adrien | M | NC | US | 1 | Umstead 100M 2023 (30 hours) |
| 100100 | Cooper | Alan | M | GBR | GB | 16 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 109974 | Cooper | Ali | F | Georgia | US | 4 | HOKA Bandera 100km 2023 (17 hours) |
| 113305 | Cooper | Brigitte | F | AB | CA | 2 | Lost Soul Ultra 100km 2023 (21 hours) |
| 112176 | Cooper | Craig | M | Utah | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 105655 | Cooper | Dustin | M | NC | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 105571 | Cooper | Iris | F | ON | CA | 32 | Javelina Jundred 100M 2023 (30 hours) |
| 101391 | Cooper | Lance | M | OR | US | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 118867 | Cooper | Luke | M | Victoria | AU | 1 | Surf Coast Century 100km 2023 (16 hours) |
| 114867 | Cooper | Lyndon | M | Essex | GB | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 115368 | Cooper | Meryl | F | Aberdeenshire | GB | 1 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 118011 | Cooper | Samuel | M | CA | US | 1 | Canyons by UTMB 100M 2023 (32 hours) |
| 107403 | Cooter | Jordan | M | Y | US | 4 | Laurel Highlands 70.5M 2023 (20 hours) |
| 111917 | Cope | Rob | M | London | GB | 2 | Val d'Aran by UTMB, Camins de Hèr 105km 2023 (26 hours) |
| 118859 | Cope | Susan | F | OK | US | 1 | Brazos Bend 100M 2022 (30 hours) |
| 118479 | Copenhafer | Jordan | M | Pennsylvania | US | 1 | Eastern States 100M 2023 (36 hours) |
| 112323 | Corbett | Austin | M | AZ | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 110367 | Corbett | Jason | M | Arizona | US | 2 | Cocodona 250M 2023 (125 hours) |
| 101077 | Corbett | Sam | M | CA | US | 8 | Tarawera 100K 102km 2023 (17 hours) |
| 103029 | Corbett | Trish | F | AZ | US | 4 | Hennepin 100M 2023 (30 hours) |
| 112767 | Corcione | Joseph | M | Arizona | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 117653 | Corcoran | Robert | M | MO | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 104420 | Cordas | David | M | KY | US | 4 | Tunnel Hill 100M 2022 (30 hours) |
| 117589 | Cordova | Ricardo | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 112095 | Corey | Adam | M | NC | US | 2 | Umstead 100M 2023 (30 hours) |
| 105224 | Corey | Brian | M | UT | US | 1 | Western States 100M 2023 (30 hours) |
| 117422 | Corey | John | M | OH | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 105197 | Corgard | Brian | M | MN | US | 32 | Bear, The 100M 2023 (36 hours) |
| 115845 | Coriele | Silvia | F | Varese | IT | 1 | Mountain Lakes 100M 2023 (30 hours) |
| 117658 | Corinne | Michaud | F | Chamonix | FR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116609 | Corman | Casey | M | California | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 116705 | Corman | Martine | F | California | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 117625 | Cornelius | Janet | F | Berlin | DE | 1 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 102610 | Cornell | Nick | M | MT | US | 2 | Grindstone 100km 2023 (18 hours) |
| 106326 | Cornell | Nicolas | M | ME | US | 8 | Ultra Trail Vipava Valley 106km 2023 (25 hours) |
| 113475 | CORNUAU | Damien | M | Hauts de France | FR | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 109966 | Corona | Vincent | M | Tennessee | US | 4 | Zion 100M 2023 (36 hours) |
| 118900 | Corpuz | Nicanor | M | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 116683 | Correia | Sandra | F | Canada | CA | 1 | Trail Alsace Grand Est by UTMB - Ultra-Trail des Chevaliers 173km 2023 (40 hours) |
| 116252 | Corrigan | Kate | F | UT | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 107196 | Corrigan | Rachel | F | Virginia | US | 4 | Massanutten 100M 2023 (36 hours) |
| 116556 | Corso | Elia | M | Italia | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 115842 | Corti | Caterina | F | Italia | IT | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118012 | Cortinovis | Oscar | M | Bergamo | IT | 1 | Ultra Trail Vipava Valley 106km 2023 (25 hours) |
| 108014 | Cossairt | Jacob | M | FL | US | 4 | Long Haul 100M 2023 (30 hours) |
| 117505 | Cossey | Joseph | M | BC | CA | 1 | Transgrancanaria 125km 2023 (28 hours) |
| 117567 | Cosson | Alfredo | M | MIranda | VE | 1 | Grindstone 100km 2023 (18 hours) |
| 110362 | Costa | Brandon | M | CA | US | 2 | Rio Del Lago 100M 2023 (30 hours) |
| 102262 | Costello | Jordan | F | CA | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 109438 | Costilow | Brian | M | TN | US | 4 | Bear, The 100M 2023 (36 hours) |
| 102060 | Cote | Gilles | M | Hawaii | US | 128 | Zion 100km 2023 (19 hours) |
| 112801 | Cote | Jean-Sebastien | M | QC | CA | 2 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 117413 | Cote-Vaillancourt | Fabien | M | Alberta | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 111880 | Cotton | Ryan | M | Washington | US | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 118478 | Cottrell | Alec | M | MT | US | 1 | Bighorn 100M 2023 (35 hours) |
| 109524 | Cottrell | Bill | M | OR | US | 4 | Bear, The 100M 2023 (36 hours) |
| 116610 | Cottrell | Collin | M | Texas | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 105992 | Cottrell | Jesse | M | WV | US | 8 | Rim to River 100M 2023 (32 hours) |
| 112730 | Coubrough | Benn | M | New South Wales | AU | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 111881 | Couch | Jeremy | M | Kentucky | US | 2 | Canal Corridor 100 100M 2023 (30 hours) |
| 117999 | Couget | Julien | M | Hautes Pyrenees | FR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104144 | Coughlan | Sean | M | AR | US | 16 | Arkansas Traveler 100M 2023 (30 hours) |
| 101962 | Coughlin | Drew | M | CA | US | 8 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 100052 | Coughlin | Pamela | F | CA | US | 16 | Miwok 100km 2023 (15.5 hours) |
| 115452 | Coull | Gregg | M | Scotland | GB | 1 | West Highland Way 95M 2023 (30 hours) |
| 111550 | Coulter | Kylie | F | Berkshire | GB | 2 | South Downs Way 100M 2023 (30 hours) |
| 118626 | Court | Sylvain | M | Savoie | FR | 1 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 117079 | Courtney | Michael | M | Hawkes Bay | NZ | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 111984 | Courtright | Josh | M | CO | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 102185 | Coury | Jamil | M | AZ | US | 64 | Javelina Jundred 100M 2023 (30 hours) |
| 104955 | Coury | Nick | M | AZ | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 104119 | Cousinie | Mathieu | M | FRA | FR | 4 | Trail 100 Andorra by UTMB 105km 2023 (30 hours) |
| 109642 | Cousins | Stephen | M | West Sussex | GB | 4 | South Downs Way 100M 2023 (30 hours) |
| 115719 | coutant | alexandre | M | Quebec | CA | 1 | Quebec Mega Trail 110km 2023 (22 hours) |
| 116937 | Couteau | Clemence | F | MA | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 118586 | Couts | Nick | M | co | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 108407 | Couvreux | Brendan | M | Colorado | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 114871 | Cowart | Michael | M | CO | US | 1 | Never Summer 103km 2023 (23 hours) |
| 101019 | Cowdry | Tremayne | M | GBR | GB | 8 | North Downs Way 100M 2023 (30 hours) |
| 116822 | Cox | Andrew | M | NY | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 111891 | Cox | Charlotte | F | Ca | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 102976 | Cox | Kevin | M | TN | US | 64 | Georgia Death Race 74M 2023 (23 hours) |
| 106005 | Cox | Phil | M | CA | US | 16 | Canyons by UTMB 100km 2023 (18 hours) |
| 110045 | Cox | Ryan | M | MD | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 102463 | Cox | Stuart | M | AUS | AU | 16 | Surf Coast Century 100km 2023 (16 hours) |
| 111968 | Cox | Tyler | M | WA | US | 2 | Siskiyou Outback 100km 2023 (17 hours) |
| 109437 | Coxe | Chuck | M | NV | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 112342 | Coy | Andrew | M | NY | US | 2 | San Diego 100M 2023 (32 hours) |
| 102808 | Coyle | Joseph | M | PA | US | 32 | Grossglockner UltraTrail 110km 2023 (28 hours) |
| 118429 | Coyles | David | M | Australian Capital Territory | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 115898 | Cozad | Jared | M | CA | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 109057 | Craig | Jason | M | ACT | AU | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 117072 | Craig | Jason | M | Taranaki | NZ | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 116418 | Craig | Robert | M | CO | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 118075 | Crain | Austin | M | TX | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 115025 | Crain | Darrell | M | TX | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 104876 | Crain | Matt | M | IL | US | 1 | Western States 100M 2023 (30 hours) |
| 108870 | Cramer | Carmen | F | NY | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 112666 | Cramer | Lucas | M | OR | US | 2 | Waldo 100km 2023 (18 hours) |
| 113514 | Crandall | Jessica | F | CT | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 116994 | Crane | Corrie | F | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 111669 | Crane | Evan | M | Scotland | GB | 2 | Race to the Stones 100km 2023 (17 hours) |
| 116501 | crapps | Keith | M | SC | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 118564 | Craven | Suzanne | F | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 112296 | Crawford | Joseph | M | Virginia | US | 2 | Grindstone 100km 2023 (18 hours) |
| 118607 | Crawford | Matt | M | Taranaki | NZ | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 108601 | Crawford | Sam | M | London | GB | 4 | Ultra Trail Lago d'Orta 102km 2023 (24 hours) |
| 112144 | Creed | Michael | M | WA | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 114180 | Crellin | Alexis | F | Utah | US | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115435 | Crespo | Daniel | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 112433 | Cress | Angie | F | Georgia | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 117278 | cretton | morgane | F | france | FR | 1 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 117992 | Creveling | Adam | M | PA | US | 1 | Laurel Highlands 70.5M 2023 (20 hours) |
| 118568 | Crewe | Thomas | M | Greater London | GB | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 100504 | Crews | Brandon | M | NC | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 117475 | Cribbes | Anthony | M | VIC | AU | 1 | Surf Coast Century 100km 2023 (16 hours) |
| 101580 | Criminale | Lucca | F | WA | US | 4 | Oregon Cascades 100M 2023 (32:01:18) |
| 118207 | Criner | Michael | M | TX | US | 1 | Brazos Bend 100M 2022 (30 hours) |
| 114331 | Crismon | Joseph | M | IL | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 100030 | Crispino-Taylor | Anne | F | OR | US | 128 | Javelina Jundred 100M 2023 (30 hours) |
| 108346 | Croisant | Lauren | F | Ohio | US | 4 | Burning River 100M 2023 (30 hours) |
| 109103 | Croke | Ciaran | M | Dublin | IE | 4 | Tor des Géants 330km 2023 (132 hours) |
| 113665 | Crombez | Andi | M | Oost-Vlaanderen | BE | 2 | Trail Alsace Grand Est by UTMB - Ultra-Trail des Païens 109km 2023 (21 hours) |
| 112409 | Cromwell | Joshua | M | Virginia | US | 1 | Western States 100M 2023 (30 hours) |
| 118909 | CROS | Valery | M | TARN | FR | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 108622 | Crosby | Cole | M | Rhode Island | US | 4 | Quebec Mega Trail 100M 2023 (40 hours) |
| 118320 | Cross | Brendan | M | WA | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 105861 | Crouse | Casey | M | IN | US | 4 | Leadville Trail 100M 2023 (30 hours) |
| 111800 | Crouzier | Nicolas | M | MD | US | 2 | Laurel Highlands 70.5M 2023 (20 hours) |
| 104560 | Crow | Tim | M | OH | US | 1 | Western States 100M 2023 (30 hours) |
| 115248 | Crowe | Darren | M | Limerick | IE | 1 | Kerry Way Ultra 193km 2023 (40 hours) |
| 116315 | Crowe | Robert | N | MI | US | 1 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 119066 | Croxdale | Troy | M | California | US | 1 | Tahoe 200 202M 2023 (100 hours) |
| 112485 | Crozier | Ian | M | Essex | GB | 2 | Autumn 100M 2023 (28 hours) |
| 105055 | Crumley | Brent | M | ID | US | 2 | Beaverhead 100km 2023 (20 hours) |
| 108395 | Crutchfield | Jen | F | MI | US | 4 | Mohican 100M 2023 (32 hours) |
| 116080 | Cruz | Janssen | M | Tondo | PH | 1 | Autumn 100M 2023 (28 hours) |
| 108006 | Cruz | Jose | M | Utah | US | 4 | Wasatch Front 100M 2023 (36 hours) |
| 118987 | Cruz Bravo | Jorge | M | Ciudad de México | MX | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 117385 | Cucco | Francesco | M | France | FR | 1 | Doi Inthanon Thailand by UTMB 100M 2022 (48 hours) |
| 104142 | Cuddy | Jason | M | GBR | GB | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116697 | Cuesta navarrete | Jonathan | M | Baja california | MX | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118848 | Cueto | Austin | M | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 111524 | Cuffe | Michael | M | Victoria | AU | 2 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 113068 | Cullison | Alex | M | PA | US | 2 | Laurel Highlands 70.5M 2023 (20 hours) |
| 103004 | Culmo | Brian | M | UT | US | 8 | Hardrock 100M 2023 (48 hours) |
| 102715 | Culp | Kelvin | M | TX | US | 16 | Brazos Bend 100M 2022 (30 hours) |
| 104271 | Culpepper | Chris | M | TX | US | 64 | HOKA Bandera 100km 2023 (17 hours) |
| 117034 | Cumahling | Romando | M | PH-IFUGAO | US | 1 | Pulag 100 Trail 118km 2023 (35 hours) |
| 106161 | Cummings | Alex | M | CO | US | 4 | Never Summer 103km 2023 (23 hours) |
| 117209 | Cummings | Brian | M | MD | US | 1 | Long Haul 100M 2023 (30 hours) |
| 116566 | Cummings | Steevo | M | Pa | US | 1 | Worlds End 100km 2023 (19 hours) |
| 118462 | cummins | kelly | F | london | GB | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 111130 | Cummins | Matt | M | New Jersey | US | 2 | Laurel Highlands 70.5M 2023 (20 hours) |
| 105720 | Cundy | Lance | M | MN | US | 8 | Zion 100km 2023 (19 hours) |
| 114937 | Cunha-Rigby | Matthew | M | CA | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 101633 | Cunningham | Jake | M | CA | US | 8 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 113923 | Cunningham | Janet | F | CA | US | 2 | Burning River 100M 2023 (30 hours) |
| 104386 | Cunningham | Richie | M | UT | US | 1 | Western States 100M 2023 (30 hours) |
| 112901 | Cupiał | Jacek | M | Slaskie | PL | 2 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 115230 | Curdy | Maxence | M | Auvergne | FR | 1 | Ultra Trail du Saint-Jacques by UTMB 123km 2023 (26 hours) |
| 106492 | Curley | Jacob | M | VA | US | 8 | Hellgate 100km 2022 (17 hours) |
| 101650 | Curley | Matt | M | IL | US | 32 | Canyons by UTMB 100M 2023 (32 hours) |
| 118503 | Curmer | Gregoire | M | France | FR | 1 | Ultra-Trail Snowdonia by UTMB 165km 2023 (50 hours) |
| 116732 | Currie | James | M | QLD | AU | 1 | Guzzler Ultra 100km 2023 (24 hours) |
| 111995 | Currie | Mandy | F | saskatchewan | CA | 2 | Canadian Death Race 125km 2023 (24 hours) |
| 117183 | Curry | Katie | F | BC | CA | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 103868 | Curtin | David | M | IN | US | 64 | HOKA Bandera 100km 2023 (17 hours) |
| 109910 | Curtin | Jim | M | IL | US | 2 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 100724 | Curtin | Kyle | M | CO | US | 2 | Tor des Géants 330km 2023 (132 hours) |
| 109195 | Curtis | Anna | F | WI | US | 4 | Bighorn 100M 2023 (35 hours) |
| 103312 | Curtis | Todd | M | MA | US | 4 | Twisted Branch 100km 2023 (20 hours) |
| 117116 | Cush | Kate | F | NSW | AU | 1 | Surf Coast Century 100km 2023 (16 hours) |
| 105160 | Cushma | John | M | GA | US | 1 | Western States 100M 2023 (30 hours) |
| 108544 | Cusseneers | Nick | M | Antwerpen | BE | 4 | Les Coursières des Hauts du Lyonnais 111km 2023 (22 hours) |
| 115966 | Cutler | Jonathan | M | Hampshire | GB | 1 | Thames Path 100 100M 2023 (28 hours) |
| 106489 | Cutter | Davis | M | MA | US | 4 | Oregon Cascades 100M 2023 (32:01:18) |
| 104758 | Cuttle | Ben | M | GBR | GB | 8 | North Downs Way 100M 2023 (30 hours) |
| 102289 | Cygan | Piotr | M | POL | PL | 32 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 105927 | Cyril | Bernard | M | FRA | FR | 8 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 100393 | Czapski | Piotr | M | POL | PL | 32 | Oregon Cascades 100M 2023 (32:01:18) |
| 112505 | Czeczotková | Helena | F | Česká republika | CZ | 2 | Istria by UTMB 110km 2023 (24 hours) |
| 103323 | D'Alessio | Joseph | M | MA | US | 64 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 116525 | D'Ambrosia | Katie | F | PA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 108468 | Dąbrowski | Kamil | M | dolnośląskie | PL | 2 | Istria by UTMB 168km 2023 (46 hours) |
| 107859 | Daff | Jody | F | Victoria | AU | 2 | Kosciusko by UTMB 100M 2022 (36 hours) |
| 107752 | Dagenais | Heather | F | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 106392 | Dagnino Marquez | Gean Ivan | M | MEX | MX | 128 | San Diego 100M 2023 (32 hours) |
| 116351 | DAGostini | MIke | M | CA | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 115280 | Dagostino | Stefano | M | Torino | IT | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 115673 | Dahl Sommerseth | Stian | M | Oslo | NO | 1 | Black Canyon 100km 2023 (17 hours) |
| 103222 | Dai | William | M | CA | US | 64 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 104245 | Dailey | Bruce | M | ME | US | 64 | Leadville Trail 100M 2023 (30 hours) |
| 113098 | Daily | Cody | M | Indiana | US | 1 | Western States 100M 2023 (30 hours) |
| 100858 | Dains | Brad | M | IA | US | 32 | Hennepin 100M 2023 (30 hours) |
| 115411 | Dakpogan | David | M | Hauts-de-Seine | FR | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 104607 | Dalal | Satpal | M | CA | US | 4 | Rio Del Lago 100M 2023 (30 hours) |
| 111148 | Dale | Kieran | M | Surrey | GB | 2 | South Downs Way 100M 2023 (30 hours) |
| 118431 | Dall | Katie | F | Queensland | AU | 1 | Blackall 100K 100km 2023 (18 hours) |
| 118959 | Dalla Fontana | Silvia | F | Veneto | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 103633 | Dalmasso | Luca | M | ITA | IT | 32 | Ultra Trail Lago d'Orta 102km 2023 (24 hours) |
| 118652 | Dalton | Christian | M | OH | US | 1 | Grindstone 100M 2023 (38 hours) |
| 100885 | Dalton | Christopher | M | CA | US | 8 | Lost Soul Ultra 100km 2023 (21 hours) |
| 106761 | Dalton | Mike | M | GA | US | 8 | Pinhoti 100M 2023 (31 hours) |
| 115415 | Dalton | Patrick | M | London | GB | 1 | Autumn 100M 2023 (28 hours) |
| 102569 | Daly | Michael | M | CA | US | 16 | Canyons by UTMB 100km 2023 (18 hours) |
| 116298 | Dambrosio | Marc | M | Arizona | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 116352 | Dameno | Andrea | M | Milano | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 112490 | Dammann | Moritz | M | Nrw | US | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 102621 | Damone | Darren | M | PA | US | 8 | Worlds End 100km 2023 (19 hours) |
| 116562 | Damveld | Mark | M | Michigain | US | 1 | Hennepin 100M 2023 (30 hours) |
| 110311 | Dana | Aaron | M | NY | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 114697 | Danaher | Sean | M | OR | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 115468 | Dando | Amanda | F | New York | US | 1 | Mohican 100M 2023 (32 hours) |
| 100951 | Daniel | Natalie | F | NC | US | 8 | Massanutten 100M 2023 (36 hours) |
| 117923 | Daniel | Philippe | M | Singapore | SG | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 118254 | Daniels | Alex | M | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 116442 | Daniels | Ed | M | CA | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 115761 | Daniels | Matt | M | Colorado | US | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116010 | Dannowitz | Bryan | M | Missouri | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 104402 | Danyliw | Roman | M | PA | US | 16 | Eastern States 100M 2023 (36 hours) |
| 118529 | Danzeisen | Clara | F | Florida | US | 1 | Long Haul 100M 2023 (30 hours) |
| 102926 | Darden | Shane | M | OR | US | 8 | Cuyamaca 100km 2023 (17 hours) |
| 108643 | Darigo | Austin | M | PA | US | 4 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 115876 | Darling | Dan | M | IL | US | 1 | Hennepin 100M 2023 (30 hours) |
| 115110 | Darnand | Emilie | F | Rhône | FR | 1 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 103755 | Dart | Hank | M | ID | US | 2 | Gorge Waterfalls 100km 2023 (17 hours) |
| 116364 | Dasalla | Michael | M | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 111165 | Datema | Jared | M | Alabama | US | 2 | Hennepin 100M 2023 (30 hours) |
| 107805 | Dattatreya | Robi | M | Noord Holland | NL | 4 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 116383 | Daulton | Heidi | F | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 118883 | DAUPLAIS | Julien | M | QC | CA | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 106762 | Davenport | Trevor | M | Arizona | US | 32 | Zion 100km 2023 (19 hours) |
| 105285 | Davery | Gilles | M | CA | US | 8 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 111710 | david | ivanoff | M | 170 chemin des charmilles | FR | 1 | Western States 100M 2023 (30 hours) |
| 115349 | DAVID | Ludovic | M | Haut de Seine | FR | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 113595 | David | TJ | M | CO | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 105262 | Davidson | Sara | F | MD | US | 16 | Tunnel Hill 100M 2022 (30 hours) |
| 117556 | Davidson | Scott | M | Saskatchewan | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 115611 | Davidson | Taylor | M | Tennessee | US | 1 | No Business 100M 2023 (33.5 hours) |
| 104684 | Davies | Dai | M | GBR | GB | 16 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 116049 | Davies | Eric | M | CA | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 105770 | Davies | Gareth | M | NZL | NZ | 2 | Tarawera 100K 102km 2023 (17 hours) |
| 107468 | Davies | James | M | Virginia | US | 4 | Hellgate 100km 2022 (17 hours) |
| 112971 | Davies | Justin | M | OR | US | 2 | Brazos Bend 100M 2022 (30 hours) |
| 108984 | Davies | Megan | F | Other | GB | 2 | North Downs Way 100M 2023 (30 hours) |
| 112347 | Davies | Ronald | M | Berkshire | GB | 2 | North Downs Way 100M 2023 (30 hours) |
| 114673 | Davies Sahlstrom | Linn | F | Scania | SE | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 118104 | Davies-Smith | Tom | M | Herefordshire | GB | 1 | Autumn 100M 2023 (28 hours) |
| 112722 | DAVIN | GUILLAUME | M | PARIS | FR | 2 | Tarawera 100K 102km 2023 (17 hours) |
| 119003 | Davin | Mark | M | British Columbia | CA | 1 | Race to the Stones 100km 2023 (17 hours) |
| 105134 | Davis | Aaron | M | ID | US | 8 | Oregon Cascades 100M 2023 (32:01:18) |
| 109458 | Davis | Ethan | M | ID | US | 4 | Bigfoot 206M 2023 (100 hours) |
| 101105 | Davis | Heather | F | AB | CA | 1 | Western States 100M 2023 (30 hours) |
| 106763 | Davis | Hugh | M | OR | US | 128 | Black Canyon 100km 2023 (17 hours) |
| 104633 | Davis | Jack | M | ZAF | ZA | 128 | Waldo 100km 2023 (18 hours) |
| 110211 | Davis | Jason | M | Ca | US | 4 | Tahoe 200 202M 2023 (100 hours) |
| 110894 | Davis | Jonathan | M | NC | US | 4 | Yeti (Virginia) 100M 2023 (30 hours) |
| 112052 | Davis | Justin | M | FL | US | 2 | Cocodona 250M 2023 (125 hours) |
| 108153 | Davis | Kehr | F | MA | US | 2 | Worlds End 100km 2023 (19 hours) |
| 114442 | Davis | Kevin | M | New South Wales | AU | 1 | Western States 100M 2023 (30 hours) |
| 103440 | Davis | Loren | M | MT | US | 32 | Bighorn 100M 2023 (35 hours) |
| 110275 | Davis | Melissa | F | MT | US | 4 | Run Rabbit Run 100M 2023 (36 hours) |
| 111691 | Davis | Nick | M | IN | US | 2 | Superior 100 100M 2023 (38 hours) |
| 107264 | Davis | Scott | M | Florida | US | 4 | Cocodona 250M 2023 (125 hours) |
| 117926 | Davis | Tim | M | OH | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 100437 | Davis | Tobey | F | GA | US | 8 | Oregon Cascades 100M 2023 (32:01:18) |
| 118868 | Davis | Wyatt | M | OR | US | 1 | Canyons by UTMB 100M 2023 (32 hours) |
| 105268 | Dawes | Jaime | F | NM | US | 16 | Leadville Trail 100M 2023 (30 hours) |
| 114823 | Dawson | Garth | M | Auckland | NZ | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 115930 | Dawson | Jonathan | M | California | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 112895 | Dawson | Lynsey | F | Cumbria | GB | 2 | Race to the Stones 100km 2023 (17 hours) |
| 108742 | Day | David | M | Georgia | US | 4 | Pinhoti 100M 2023 (31 hours) |
| 118398 | Day | Eugene | M | WA | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 111627 | Day | Lachlan | M | Victoria | AU | 2 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 102042 | Day | Steve | M | BC | CA | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104310 | Daylor | Shaun | M | MA | US | 128 | Zion 100M 2023 (36 hours) |
| 118931 | De Fabrizio | Melissa | F | CT | US | 1 | Massanutten 100M 2023 (36 hours) |
| 117246 | de Frutos | Abel | M | Segovia | ES | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 116385 | De Gasperi | Roberto | M | Italy | IT | 1 | Swiss Alps 100M 2023 (49 hours) |
| 109433 | de Groof | Shawn | M | California | US | 4 | Canyons by UTMB 100km 2023 (18 hours) |
| 112990 | de Jesus | Keila | F | NJ | US | 2 | Rim to River 100M 2023 (32 hours) |
| 118457 | De La Cruz | Elder | M | Massachusetts | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 106563 | De La Rosa | Ezequiel | M | CA | US | 16 | San Diego 100M 2023 (32 hours) |
| 101683 | de la Rosa | Jade | F | WA | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 119136 | de la Rosa | Nickademus | M | CA | US | 1 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 107339 | De La Vega | Christopher | M | CA | US | 4 | Sean O'Brien 100km 2023 (16 hours) |
| 115049 | de los Cobos | Brian | M | CA | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 118923 | De meulenaere | Valere | M | Seine et Marne | FR | 1 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 108481 | de Narp | Augustin | M | France | FR | 4 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 116436 | DE NARP | BENJAMIN | N | France | FR | 1 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 107557 | De Neve | Pieter | M | Please select a state | BE | 4 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 100209 | De Riz | Francesco | M | ITA | IT | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 116570 | de Rocquigny | Hugues | M | NSW | AU | 1 | Kosciusko by UTMB 100km 2022 (18 hours) |
| 116886 | De Ruyter | Matthew | M | KS | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 105458 | De Schaepmeester | Christof | M | Oost Vlaanderen | BE | 32 | Istria by UTMB 110km 2023 (24 hours) |
| 115794 | de Vries | Nico | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 116125 | De Witt | Garrett | M | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 115227 | De Wulf | Alexander | M | - Select - | BE | 1 | Zugspitz 111km 2023 (25 hours) |
| 100776 | Deacon | Mitchell | M | CA | US | 16 | Canyons by UTMB 100km 2023 (18 hours) |
| 117655 | Deadman | Travis | M | ca | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 112639 | Deakin | Noel | M | New South Wales | AU | 2 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 115515 | Deal | Sarah | F | Maryland | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 117284 | Dean | John | M | British Columbia | CA | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 116615 | Dean | Joshua | M | KY | US | 1 | No Business 100M 2023 (33.5 hours) |
| 115982 | Dean | Mac | M | Tennessee | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 105680 | Deaton | David | M | NJ | US | 4 | Canal Corridor 100 100M 2023 (30 hours) |
| 115703 | Debaya | Fares | M | Gabes | TN | 1 | Salomon Cappadocia Ultra-Trail 119km 2023 (23 hours) |
| 102105 | Debevc | Amanda | F | OH | US | 64 | Hellgate 100km 2022 (17 hours) |
| 118176 | Debski | Katie | F | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 112254 | Dechelette | Franck | M | Bouches-du-Rhône | FR | 2 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 118174 | DeDoncker | John | M | IA | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 114035 | Defilippi | Kathryn | F | PA | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 102624 | Degrado | Tim | M | MN | US | 16 | Leadville Trail 100M 2023 (30 hours) |
| 117488 | DeGrandpre | Wills | M | MT | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 104100 | DeGroff | Sierra | F | NV | US | 16 | Miwok 100km 2023 (15.5 hours) |
| 103697 | Degroot | Jeffrey | M | MI | US | 16 | Zion 100km 2023 (19 hours) |
| 118268 | DeHaan | Megan | F | Montana | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 115104 | DeHaan | Nicholas | M | CO | US | 1 | Never Summer 103km 2023 (23 hours) |
| 118908 | Dehalu | Boris | M | Liege | BE | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 110284 | deHesse | Margaret | F | Arizona | US | 4 | Cuyamaca 100km 2023 (17 hours) |
| 115565 | DeJoannis | Jason | M | MA | US | 1 | Massanutten 100M 2023 (36 hours) |
| 110995 | Del Sarto | Nicolette | F | California | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 114692 | Delahey | Matt | M | Saskatchewan | CA | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 118665 | Delaney | Amy | F | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 113100 | Delarosa | Matthew | M | Colorado | US | 2 | Bighorn 100M 2023 (35 hours) |
| 112432 | Delavega | Kevin | M | CA | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 106770 | Delbecq | Jean-François | M | Bourgogne-Franche-Comté | FR | 16 | Istria by UTMB 110km 2023 (24 hours) |
| 115536 | Delcambre | Brad | M | LA | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 115323 | Delgado | Jeward | M | Davao del Norte | PH | 1 | Pulag 100 Trail 118km 2023 (35 hours) |
| 112856 | Delgado | Oscar | M | IL | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 114466 | Delgado Espinoza | Max | M | Perú | PE | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117094 | Delgado Rodriguez | Roberto Jaime | M | Andalucia | ES | 1 | Val d'Aran by UTMB, Camins de Hèr 105km 2023 (26 hours) |
| 101961 | Delille | Remi | M | NC | US | 2 | Cascade Crest 100M 2023 (35 hours) |
| 118875 | Delisle | Jean-Philippe | M | Quebec | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 102628 | Dell Angelo | Robert | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 103320 | Dellamonica | Lesley | F | CA | US | 16 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 117599 | Delorme | Bastien | M | Rhône alpes | FR | 1 | Les Coursières des Hauts du Lyonnais 111km 2023 (22 hours) |
| 103822 | Delozier | John | M | TX | US | 16 | Black Canyon 100km 2023 (17 hours) |
| 118013 | DeMarco | Michael | M | LA | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 103404 | Demare | Romain | M | Geneve | CH | 16 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 112089 | DeMeerleer | Ben | M | WA | US | 2 | Siskiyou Outback 100km 2023 (17 hours) |
| 114125 | Demmings | Brian | M | New Brunswick | CA | 2 | Zion 100M 2023 (36 hours) |
| 117662 | Demorest | Shanda | F | MN | US | 1 | Mountain Lakes 100M 2023 (30 hours) |
| 115920 | Dempsey | Sean | M | California | US | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 103635 | Den Hartog | Sander | M | NLD | NL | 8 | Penyagolosa 115km 2023 (26 hours) |
| 106274 | Denbleyker | Tracy | F | MI | US | 2 | Bighorn 100M 2023 (35 hours) |
| 109067 | Deneffe | Guillaume | M | Liège | BE | 4 | Nice Côte d'Azur by UTMB 159km 2023 (48 hours) |
| 114793 | Dengate | Justin | M | NSW | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 109005 | Denis | Laurence | U | CA | US | 2 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 114908 | Denizac | Ivan | N | Oregon | US | 1 | Waldo 100km 2023 (18 hours) |
| 112747 | Dennes | Jill | F | TN | US | 2 | Eastern States 100M 2023 (36 hours) |
| 108672 | Denson | Marco | M | California | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 113285 | dentith | dany | M | Auckland | NZ | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 117954 | Dentz Sinclair | Eirik | M | Bas Rhin | FR | 1 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 117233 | DeNucci | Dan | M | Minnesota | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 118228 | Deocampo | Hymmy Rhythm | M | Negros Occidental | PH | 1 | Scott TMBT 109km 2023 (30 hours) |
| 117895 | Deome | Harley | M | California | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 109202 | Depaoli | Mattia | M | Trento | IT | 4 | Zugspitz 111km 2023 (25 hours) |
| 114196 | DePew | Clinton | M | NY | US | 2 | Laurel Highlands 70.5M 2023 (20 hours) |
| 116629 | Deppen | Jeremy | M | Virginia | US | 1 | Grindstone 100km 2023 (18 hours) |
| 102943 | Deras | Michael | M | CA | US | 8 | Bear, The 100M 2023 (36 hours) |
| 110182 | Derbyshire | Alex | M | CA | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 114454 | Dermody | Matthew | M | NL | CA | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 108183 | Dern | Ashley | F | Utah | US | 1 | Wasatch Front 100M 2023 (36 hours) |
| 115657 | DeRosier | Logan | M | TX | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 112126 | deRosset | Robert | M | NC | US | 2 | Umstead 100M 2023 (30 hours) |
| 102524 | Derouen | Brian | M | WV | US | 8 | Cruel Jewel 106M 2023 (48 hours) |
| 117179 | Derov | Johnny | M | Ohio | US | 1 | Burning River 100M 2023 (30 hours) |
| 117340 | Derr | Bryan | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 111842 | Derstine | Liz | F | MA | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 118845 | DERY | JOE | M | Quebec | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 115092 | Desaleux | Arthur | M | Provence | FR | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 104456 | Desantis | Nick | M | NJ | US | 8 | Yeti (Virginia) 100M 2023 (30 hours) |
| 115291 | DESCAMPS | Xavier | M | Belgique (+32) | BE | 1 | Trail Alsace Grand Est by UTMB - Ultra-Trail des Chevaliers 173km 2023 (40 hours) |
| 115429 | Desch | Rich | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 103634 | Descombes | Pierre-Yves | M | FRA | FR | 16 | Ultra Trail du Saint-Jacques by UTMB 123km 2023 (26 hours) |
| 117681 | Descouens | Frank | M | British Columbia | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 101591 | Deshaies | Eric | M | QC | CA | 32 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 101671 | Deshpande | Shashank | M | CA | US | 4 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 109895 | Desille | Clément | M | Haute Savoie | FR | 4 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 115065 | DeSimone | Eric | M | FL | US | 1 | Long Haul 100M 2023 (30 hours) |
| 112887 | DESPREAUX | JEREMY | M | HAUT DE FRANCE | US | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116337 | DesRochers | Lindsay | F | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 116921 | Dessertenne | Philippe | M | QC | CA | 1 | Quebec Mega Trail 110km 2023 (22 hours) |
| 109706 | Detamore | Matt | M | CO | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 116169 | Dethman | Morgan | F | North Carolina | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 105499 | Detmer | Maia | F | NV | US | 1 | Western States 100M 2023 (30 hours) |
| 115431 | Dettelbach | Kate | F | CO | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 117142 | Detvaj | Martin | M | Nitriansky | SK | 1 | Letecka Stovka 104km 2023 (22 hours) |
| 115342 | DEVILLE CAVELLIN | Matthieu | M | Gironde | FR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 103540 | Devine | Adam | M | NY | US | 16 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 111600 | Devlin | Fabian | M | Merseyside | GB | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 115585 | DeVoto Noonan | Terin | M | CO | US | 1 | Never Summer 103km 2023 (23 hours) |
| 107409 | Dewey | Jonathon | M | MI | US | 4 | Hennepin 100M 2023 (30 hours) |
| 106774 | Dewey | Nathan | M | 8 | Massanutten 100M 2023 (36 hours) | ||
| 116397 | Dewez | Jon | M | California | US | 1 | Zion 100km 2023 (19 hours) |
| 107513 | DeWitt | Lisa | F | OR | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 116045 | DeWitt | Scott | M | IL | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 117361 | deyesso | Karen | F | ME | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 116439 | Di Cristina Centeno | Raul | M | Puerto Rico | PR | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 109558 | Di Giacomo | Fabio | M | Italia | IT | 4 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 116557 | Dial-Duran | Erin | F | Iowa | US | 1 | Hennepin 100M 2023 (30 hours) |
| 109326 | Diamond-Husmann | Kara | F | CO | US | 4 | Cocodona 250M 2023 (125 hours) |
| 118573 | Diaz | Gabriela | F | Mendoza | AR | 1 | Patagonia 100M 2023 (37 hours) |
| 116981 | Diaz | Isabel | F | Ca | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 105745 | Diaz | Omar | M | TX | US | 8 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118682 | Diaz Alba | Manuel | M | malaga | US | 1 | Ultra Trail Sierras del Bandolero 166km 2023 (40 hours) |
| 117238 | Díaz Rodríguez | Gladys Verónica | F | Lima | PE | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 103959 | Dib | Nathan | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 110629 | Diboun | Jamal | M | NY | US | 4 | Eastern States 100M 2023 (36 hours) |
| 101753 | Diboun | Yassine | M | OR | US | 8 | Hardrock 100M 2023 (48 hours) |
| 115261 | Dick | Iain | M | North Lanarkshire | GB | 1 | West Highland Way 95M 2023 (30 hours) |
| 105670 | Dick | Josh | M | NB | CA | 16 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 115694 | Dick | Matthew | M | KY | US | 1 | No Business 100M 2023 (33.5 hours) |
| 103870 | Dickason | Benjamin | M | CO | US | 32 | HOKA Bandera 100km 2023 (17 hours) |
| 107485 | Dicke | Ben | M | IL | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 118463 | Dickerson | Adam | M | NC | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 116827 | Dickinson | Trevor | M | Alberta | CA | 1 | Lost Soul Ultra 100km 2023 (21 hours) |
| 114192 | Dickman | Ludvig | M | Stockholm | SE | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118892 | dickmann | kathryn | F | CO | US | 1 | High Lonesome 100M 2023 (37 hours) |
| 116625 | Didier | David | M | Santa Fe | AR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117983 | Diedrich | Tim | M | MT | US | 1 | Beaverhead 100km 2023 (20 hours) |
| 116868 | DIEHL | TRAVIS | M | Ohio | US | 1 | No Business 100M 2023 (33.5 hours) |
| 115803 | Dietenberger | Nico | M | Baden Württemberg | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 103856 | Dietrich | Travis | M | CA | US | 64 | Cuyamaca 100km 2023 (17 hours) |
| 118877 | Dietze | Julian | M | Northrhine-Westphalia | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 112613 | DiFalco | Mark | M | AZ | US | 2 | Wasatch Front 100M 2023 (36 hours) |
| 115079 | DiGiovanni | MDiGiRunner | M | CA | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 100945 | Dill | Franz | M | CA | US | 4 | No Business 100M 2023 (33.5 hours) |
| 106617 | Dillon | Maddog | M | IL | US | 32 | Tunnel Hill 100M 2022 (30 hours) |
| 114804 | Dillon | Michael | N | PERTHSHIRE | GB | 1 | West Highland Way 95M 2023 (30 hours) |
| 112182 | Dilluvio-Scott | Dandelion | F | Wyoming | US | 2 | Bighorn 100M 2023 (35 hours) |
| 117515 | DILOSQUET | Olivier | M | Finistère | FR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 113859 | DiMarco | Nicholas | M | Texas | US | 2 | HOKA Bandera 100km 2023 (17 hours) |
| 114875 | Dimitrie | David | M | California | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 116681 | Dimmock | Matthew | M | UK | GB | 1 | Autumn 100M 2023 (28 hours) |
| 109947 | Dimond | Matthew | M | OR | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 118571 | Dimond | Rachel | F | NSW | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 101811 | Dina | Matthew | M | CA | US | 32 | Miwok 100km 2023 (15.5 hours) |
| 102745 | Dinan | Drew | M | OR | US | 64 | Swiss Alps 100km 2023 (22 hours) |
| 110327 | Dinc | Yekta Yigit | M | - | TR | 4 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 100452 | Dines | Tim | M | TN | US | 64 | Zion 100km 2023 (19 hours) |
| 117741 | Ding | Jianjun | M | Beijing | CN | 1 | Ninghai Ultra Trail 109km 2023 (24 hours) |
| 116723 | DING | LING LI | F | BC | CA | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115602 | Dingess | Dan | M | Ga | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 114659 | Dinkle | Zachary | M | WI | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 113693 | Dinnett | Craig | M | Jersey | JE | 2 | Swiss Alps 100M 2023 (49 hours) |
| 109289 | Dion | Sébastien | M | Québec | CA | 2 | Zion 100km 2023 (19 hours) |
| 107771 | Dirks | Nathaniel | M | PA | US | 4 | High Lonesome 100M 2023 (37 hours) |
| 111736 | Dirvin | Nate | M | NJ | US | 2 | Tahoe 200 202M 2023 (100 hours) |
| 115652 | disconzi | michele | M | vicenza | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 113061 | Disterhaft | Thomas | M | WI | US | 2 | Kettle Moraine 100M 2023 (30 hours) |
| 116667 | Ditsworth | Russell | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 101617 | Dittman | Bill | M | AZ | US | 4 | High Lonesome 100M 2023 (37 hours) |
| 115084 | Dixon | Daniel | M | Ga | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 113902 | Dlagnekov | Louka | N | California | US | 2 | Eastern States 100M 2023 (36 hours) |
| 112263 | Dlouhy | Derrick | M | OR | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 118721 | Do | Duy Luan | M | Hanoi | VN | 1 | Vietnam Mountain Marathon 100km 2023 (27 hours) |
| 113845 | Doane | Deanna | N | FL | US | 2 | No Business 100M 2023 (33.5 hours) |
| 118352 | Dobbins | Dana | M | WI | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 101456 | Dobler | Matthew | M | AZ | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 101270 | Dobson | Jason | M | OR | US | 4 | Mountain Lakes 100M 2023 (30 hours) |
| 103352 | Dockemeyer | Kevin | M | IL | US | 4 | Hennepin 100M 2023 (30 hours) |
| 118364 | Doemstedt | Carl-Johan | M | Vaestmanland | SE | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 111246 | Doerfler | Daniel | M | Iowa | US | 2 | Kettle Moraine 100M 2023 (30 hours) |
| 118196 | Doheijo | Ignacio | M | Don Torcuato | AR | 1 | Patagonia 112km 2023 (27 hours) |
| 116336 | Doherty | Alexander | M | Gloucestershire | GB | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 102880 | Doherty | Lance | M | MA | US | 64 | Hellgate 100km 2022 (17 hours) |
| 106777 | Doiron | Guy | M | Ontario | CA | 1 | Western States 100M 2023 (30 hours) |
| 100965 | dolde | willow | M | WA | US | 8 | Yeti (Virginia) 100M 2023 (30 hours) |
| 109066 | Dolezal | Ben | M | Texas | US | 1 | Western States 100M 2023 (30 hours) |
| 118511 | Dolin | Ashley | F | West Virginia | US | 1 | Rim to River 100M 2023 (32 hours) |
| 114076 | Doll | Julie | F | UT | US | 2 | Bear, The 100M 2023 (36 hours) |
| 113584 | Domanski | Mark | M | Virginia | US | 2 | Wasatch Front 100M 2023 (36 hours) |
| 115511 | Domené | Esteban | M | Buenos Aires | AR | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 116085 | Domrow | Ryan | M | Alberta | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 115737 | Donahue | Kyle | M | GA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 106778 | Donais | Tanya | F | Alberta | CA | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118427 | Donati | Riccardo | M | Emilia Romagna | IT | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 112781 | Donchak | Lisa | F | California | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 114483 | Dones | Andrew | M | Indiana | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 116558 | Donheiser | Carl | M | WA | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 100391 | Donnelly | Matt | M | NJ | US | 4 | Twisted Branch 100km 2023 (20 hours) |
| 105272 | Donnelly | Michael | M | ME | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 115559 | Donoghue | Patrick | M | NC | US | 1 | Laurel Highlands 70.5M 2023 (20 hours) |
| 117415 | Donovan | Chris | M | nsw | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 110645 | Donovan | Michael | M | Queensland | AU | 4 | Surf Coast Century 100km 2023 (16 hours) |
| 101968 | Donovan | Tracy | F | CA | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 119095 | Doo | Rex | M | Ca | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 116586 | Doolan | Garry | M | England | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 108538 | Doolin | Jennifer | F | WI | US | 2 | Superior 100 100M 2023 (38 hours) |
| 116222 | dorais | andrew | M | UT | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 110427 | dorantes | rene | M | CA | US | 4 | Puerto Vallarta México by UTMB 100km 2023 (18 hours) |
| 117399 | Dorgan | Brian | M | NJ | US | 1 | Burning River 100M 2023 (30 hours) |
| 104780 | Dorph | Joseph | M | VIC | AU | 8 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 114826 | Dorrance | Evan | M | Washington | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 117397 | Dorsch | Roger | M | Prague | CZ | 1 | Istria by UTMB 110km 2023 (24 hours) |
| 104797 | Dorsey | Darrel | M | MD | US | 8 | Rim to River 100M 2023 (32 hours) |
| 115440 | Dos Santos | Cyril | M | France | FR | 1 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 108243 | Dosch | Lisa | F | CA | US | 4 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 114259 | Doss | Melissa | F | Texas | US | 2 | Brazos Bend 100M 2022 (30 hours) |
| 103366 | Doty | Kevin | M | CO | US | 2 | Bighorn 100M 2023 (35 hours) |
| 115772 | Doubman | Jay | M | MA | US | 1 | Burning River 100M 2023 (30 hours) |
| 103997 | Dougherty | Heather | F | DC | US | 16 | Hellgate 100km 2022 (17 hours) |
| 103686 | Douglas | Jennifer | F | OH | US | 2 | Burning River 100M 2023 (30 hours) |
| 109102 | Dournel | Yannick | M | NA | FR | 2 | Eiger Ultra Trail 101km 2023 (23 hours) |
| 100306 | Dowdell | Michael | M | OH | US | 64 | Twisted Branch 100km 2023 (20 hours) |
| 115208 | Dowell | Andrew | M | Hong Kong Island | HK | 1 | Hong Kong 100K 100km 2023 (23 hours) |
| 115184 | Dower | Aaron | M | NSW | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 112508 | Dower | Tara | F | VA | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 113148 | Dowling | Chris | M | Herts | GB | 2 | North Downs Way 100M 2023 (30 hours) |
| 113733 | Dowling | Clinton | M | Queensland | AU | 2 | Guzzler Ultra 100km 2023 (24 hours) |
| 115541 | Dowling | Michael | M | Wicklow | IE | 1 | Kerry Way Ultra 193km 2023 (40 hours) |
| 111125 | Downes | Glenn | M | MD | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 118819 | Downes | Randy | M | Virginia | US | 1 | Eastern States 100M 2023 (36 hours) |
| 102718 | Downes | Tom | M | IRL | IE | 8 | Kerry Way Ultra 193km 2023 (40 hours) |
| 117577 | Downey | Rebecca | F | CO | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 118454 | Dowse | Anna | F | ON | CA | 1 | Canal Corridor 100 100M 2023 (30 hours) |
| 100480 | Doyle | Matthew | M | NLD | NL | 4 | Trail Verbier St Bernard by UTMB 140km 2023 (40 hours) |
| 111502 | Dr | Carsten | M | ZH | CH | 2 | Eiger Ultra Trail 250km 2023 (90 hours) |
| 108325 | Dragelin | Alec | M | TN | US | 2 | Patagonia 112km 2023 (27 hours) |
| 116912 | Dragojevic | Irena | F | Ca | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 102232 | Dragon | John | M | CO | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 115134 | Dragunas | Paulius | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 103096 | Drake | Alison | F | AUS | AU | 4 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 117793 | Drake | Ashlee | F | ID | US | 1 | Beaverhead 100km 2023 (20 hours) |
| 111497 | Drake | Henry | M | Carmarthenshire | GB | 2 | Race to the Stones 100km 2023 (17 hours) |
| 117083 | Dransfield | Thomas | M | West Yorkshire | GB | 1 | Lakeland 100M 2023 (40 hours) |
| 107278 | Draper | Cody | M | Utah | US | 4 | Bighorn 100M 2023 (35 hours) |
| 113646 | Drasler | Erin | F | CO | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 108803 | Drazer | Michael | M | IN | US | 4 | Bighorn 100M 2023 (35 hours) |
| 101602 | Drelick | Julius | M | AZ | US | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 114054 | Drescher | Arno | M | Bavaria | DE | 2 | Zugspitz 111km 2023 (25 hours) |
| 103691 | Dresher | Russell | M | MA | US | 128 | Massanutten 100M 2023 (36 hours) |
| 116044 | Drew | Dominic | M | Merseyside | GB | 1 | Julian Alps Trail Run by UTMB 106km 2023 (24 hours) |
| 118205 | Drew | Effie | F | Maine | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 102029 | Drewes | Conor | M | NV | US | 16 | Run Rabbit Run 100M 2023 (36 hours) |
| 118685 | Drews | Barbara | F | Zurich | US | 1 | Tor des Géants 330km 2023 (132 hours) |
| 104273 | Drexler | Benjamin | M | MN | US | 8 | Siskiyou Outback 100km 2023 (17 hours) |
| 118009 | Driver | Ian | M | MI | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 111847 | Drobeck | Jason | M | UT | US | 2 | Wasatch Front 100M 2023 (36 hours) |
| 109807 | Drouin | Veronique | F | Quebec | CA | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116889 | Drouyer | Matthieu | M | / | FR | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 107912 | Drozda | Kimberly | F | Pennsylvania | US | 4 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 100453 | Drozdiak | Nick | M | DC | US | 16 | Hellgate 100km 2022 (17 hours) |
| 101643 | Drummond | Andrew | M | NH | US | 2 | Ultra Tour Monte Rosa 170km 2023 (60 hours) |
| 117762 | Drury | Olivia | F | Buckinghamshire | GB | 1 | Race to the Stones 100km 2023 (17 hours) |
| 101361 | Dryer | Brenda | F | AB | CA | 16 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 115670 | Dryer | Steven | M | WI | US | 1 | Kerry Way Ultra 193km 2023 (40 hours) |
| 104978 | Dschaak | Tyler | M | CO | US | 4 | Canyons by UTMB 100M 2023 (32 hours) |
| 118820 | Du | Ronnie | M | Ontario | CA | 1 | Siskiyou Outback 100km 2023 (17 hours) |
| 118428 | Du Plessis | Nicholaas | M | Western Province | ZA | 1 | Ultra-Trail Cape Town 100M 2022 (45 hours) |
| 104280 | Duarte | Chase | M | NM | US | 4 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 108026 | DUARTE MOTA | JOSE MANUEL | M | SANTARÉM | PT | 4 | Trail de Conímbriga Terras de Sicó 111km 2023 (24 hours) |
| 118595 | Dubcovsky | Alejandra | F | CA | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 116835 | Dubé | Marilyn | F | QC | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 107902 | Dube | Tera | F | CA | US | 4 | Cuyamaca 100km 2023 (17 hours) |
| 116333 | Dube | William | M | VA | US | 1 | Zion 100M 2023 (36 hours) |
| 107862 | DuBois | Bernadette | F | Fl | US | 2 | Long Haul 100M 2023 (30 hours) |
| 114877 | Dubois | Joe | M | ON | CA | 1 | Fat Dog 120M 2023 (48 hours) |
| 105000 | DuBois | Matthew | M | UT | US | 1 | Western States 100M 2023 (30 hours) |
| 116308 | DuBois | Seth | M | Oregon | US | 1 | Zugspitz 111km 2023 (25 hours) |
| 114336 | Dubois Verret | Melina | F | Quebec | CA | 2 | Bighorn 100M 2023 (35 hours) |
| 111681 | DUBOL | Cédric | M | france | FR | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 108757 | Dubova | Michael | M | Virginia | US | 2 | Hellgate 100km 2022 (17 hours) |
| 115288 | Dubska | Martina | F | Czechia | CZ | 1 | Javornicka 105km 2023 (24 hours) |
| 118133 | Duchek | Keith | M | Utah | US | 1 | Bear, The 100M 2023 (36 hours) |
| 106241 | Duckett | Matthew | M | GBR | GB | 8 | Ultra-Trail Snowdonia by UTMB 165km 2023 (50 hours) |
| 103600 | Ducommun | Julien | M | CHE | CH | 16 | Zugspitz 111km 2023 (25 hours) |
| 116394 | Dudchenko | Paul | M | Great Britain | US | 1 | West Highland Way 95M 2023 (30 hours) |
| 114763 | Dudek | Christopher | M | Pennsylvania | US | 1 | Laurel Highlands 70.5M 2023 (20 hours) |
| 112042 | Dudley | Scott | M | OR | US | 2 | Cascade Crest 100M 2023 (35 hours) |
| 116905 | Dudney | Gary | M | NC | US | 1 | Burning River 100M 2023 (30 hours) |
| 111934 | Duede | David | M | Minnesota | US | 2 | Superior 100 100M 2023 (38 hours) |
| 116982 | Duerksen | Carter | M | NV | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 115350 | Duffy | Kelly | F | Illinois | US | 1 | Hennepin 100M 2023 (30 hours) |
| 114251 | Dufoin | Florian | M | France | FR | 2 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 102634 | Dufour | Christian | M | QC | CA | 2 | Val d'Aran by UTMB, Camins de Hèr 105km 2023 (26 hours) |
| 118396 | Dufrenois | Remy | M | Vaud | CH | 1 | SwissPeaks 100km 2023 (28 hours) |
| 113938 | Dugan | Sara | F | California | US | 2 | Cuyamaca 100km 2023 (17 hours) |
| 108674 | Duggal | Stu | M | Devon | GB | 2 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 102944 | Dugovich | Brian | M | MT | US | 1 | Western States 100M 2023 (30 hours) |
| 118938 | Dujardin | Cyril | M | Quebec | CA | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 106390 | Dukes | Don | M | OH | US | 8 | Indiana 100M 2023 (30 hours) |
| 113604 | Dulgar | Troy | M | OH | US | 2 | Mohican 100M 2023 (32 hours) |
| 115251 | Dumas | Stéphane | M | 78 - Yvelines | FR | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 101846 | Dumitrescu | Bogie | M | CO | US | 128 | Run Rabbit Run 100M 2023 (36 hours) |
| 106781 | Dumont | Frank | M | Colorado | US | 8 | Javelina Jundred 100M 2023 (30 hours) |
| 117200 | Dumortier | Quentin | M | OCCITANIE | FR | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 108366 | Dunaway | patrick | M | Ca | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 118650 | Duncan | Matthew | M | Colorado | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 103433 | Duncan | Randy | M | BC | CA | 256 | Javelina Jundred 100M 2023 (30 hours) |
| 118030 | Duncan | Samuel | M | Tennessee | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 113292 | Duncan-Friend | Emily | F | Oregon | US | 2 | Bear, The 100M 2023 (36 hours) |
| 103590 | Dundon | Stephen | M | NSW | AU | 16 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 103309 | Dunham | Darin | M | AL | US | 32 | Hellgate 100km 2022 (17 hours) |
| 117420 | Dunk | Martin | M | NSW | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 112049 | Dunkley | Jennie | F | Bedfordshire | GB | 2 | Autumn 100M 2023 (28 hours) |
| 117708 | Dunlap | Daniel | M | CO | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 117456 | Dunn | Karen | F | USA | US | 1 | Eastern States 100M 2023 (36 hours) |
| 118418 | Dunn | Oliver | M | CO | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 118088 | Dunne | Ian | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 103678 | Dunning | Patrick | M | MI | US | 32 | Canal Corridor 100 100M 2023 (30 hours) |
| 115897 | Dunsirn | Murray | M | MN | US | 1 | No Business 100M 2023 (33.5 hours) |
| 100018 | Dunstall | Lee | M | GBR | GB | 8 | North Downs Way 100M 2023 (30 hours) |
| 118933 | Duponchel | Frederic | M | Tahiti | PF | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 116095 | DuPont | Chase | M | CALIFORNIA | US | 1 | High Lonesome 100M 2023 (37 hours) |
| 116139 | Durand | David | M | Franche comte | FR | 1 | Trail Verbier St Bernard by UTMB 140km 2023 (40 hours) |
| 118118 | DURAND | Mathilde | F | France | FR | 1 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 118673 | DURAND | YANNICK | M | FRANCE | FR | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 103091 | Durante | Patrick | M | PA | US | 4 | Leadville Trail 100M 2023 (30 hours) |
| 115622 | Duras | Melanie | F | Province | CA | 1 | Quebec Mega Trail 100M 2023 (40 hours) |
| 119069 | Ďurecová | Mahuliena | F | Slovakia | SK | 1 | Javornicka 105km 2023 (24 hours) |
| 108073 | Durkan | Anneke | F | Texas | US | 4 | Never Summer 103km 2023 (23 hours) |
| 102287 | Durocher | Etienne | M | BC | CA | 16 | San Diego 100M 2023 (32 hours) |
| 107866 | Durocher | Thomas | M | Haute-Savoie | FR | 4 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 118042 | Duroux | Loïc | M | Bourgogne Franche Comté | FR | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 117276 | Dusoye | Riz | M | London | GB | 1 | South Downs Way 100M 2023 (30 hours) |
| 116304 | Dusseau | Noah | M | Washington | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 112960 | Dutfield | Stewart | M | NY | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 115383 | Duthie | Sanna | F | Wales | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 116225 | Dutkiewicz | Laurie | F | Oregon | US | 1 | Leona Divide 100km 2023 (16 hours) |
| 113125 | Dutton | Whitney | F | TX | US | 2 | Brazos Bend 100M 2022 (30 hours) |
| 115039 | Duval | Ryan | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 111177 | DuVall | Calvin | M | Missouri | US | 1 | Indiana 100M 2023 (30 hours) |
| 118537 | Dvorak | Oren | M | Ohio | US | 1 | Mohican 100M 2023 (32 hours) |
| 115428 | Dvorscak | Nick | M | AR | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 109599 | Dwitiandi | Dendi | M | Jawa Barat | ID | 2 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 113946 | Dwyer | Lindsey | F | California | US | 2 | Canyons by UTMB 100M 2023 (32 hours) |
| 116613 | Dybas | Jared | M | CT | US | 1 | Umstead 100M 2023 (30 hours) |
| 116800 | Dyck | Lillian | F | BC | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 105853 | Dyer | Joe | M | MD | US | 2 | Georgia Death Race 74M 2023 (23 hours) |
| 115739 | Dyer-Pietras | Kuwanna | F | New York | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 101942 | Dykes | Gene | M | PA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 107496 | Dykstra | Justin | M | MI | US | 4 | Gorge Waterfalls 100km 2023 (17 hours) |
| 115697 | Dyson | Alexander | M | CT | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 110181 | Dzenis | Juris | M | Sigulda | LV | 4 | Transgrancanaria 125km 2023 (28 hours) |
| 117751 | E | Josh | M | Arizona | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 104488 | Eady | Stefan | M | GA | US | 1 | Western States 100M 2023 (30 hours) |
| 118886 | Eagle | Eric | M | Washington | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 116338 | Eagle | Zach | M | Indiana | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 117024 | Earney | John | M | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 102519 | Earnshaw | Eric | M | CA | US | 8 | San Diego 100M 2023 (32 hours) |
| 106784 | Easby | Conrad | M | British Columbia | CA | 2 | Black Canyon 100km 2023 (17 hours) |
| 107406 | Eastman | Chad | M | AB | CA | 2 | Black Canyon 100km 2023 (17 hours) |
| 101987 | Ebener | Kenneth | M | SC | US | 32 | Cruel Jewel 106M 2023 (48 hours) |
| 101459 | Eber | Forrest | M | CA | US | 4 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 114128 | Ebert | James | M | AL | US | 2 | Hellgate 100km 2022 (17 hours) |
| 116689 | Ebertz | Joy | F | California | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 104361 | Ebrahem | Mina | M | EGY | EG | 1 | Western States 100M 2023 (30 hours) |
| 111940 | Eccles | Derek | M | Idaho | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 118257 | Echizenya | Rei | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 113678 | Echler | Tim | M | Ohio | US | 2 | Canal Corridor 100 100M 2023 (30 hours) |
| 114942 | Eck | Mike | M | WA | US | 1 | Mountain Lakes 100M 2023 (30 hours) |
| 112833 | Eckard | Lourensa | F | Gauteng | ZA | 2 | Ultra-Trail Cape Town 100km 2022 (21 hours) |
| 110013 | Eckardt | David | M | IN | US | 4 | Indiana 100M 2023 (30 hours) |
| 103871 | Eckardt | Scott | M | CA | US | 8 | Canyons by UTMB 100M 2023 (32 hours) |
| 117178 | Eckerlein | Christian | M | Aargau | CH | 1 | Swiss Alps 100km 2023 (22 hours) |
| 111634 | Eckford | Shaun | M | Alberta | CA | 2 | Canadian Death Race 125km 2023 (24 hours) |
| 115621 | Eckhof | Jan | M | Bavaria | DE | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 105715 | Edamoto | Kanako | F | JPN | JP | 2 | Okushinano 100km 2023 (21 hours) |
| 105609 | Eddy | Joshua | M | NV | US | 16 | Oregon Cascades 100M 2023 (32:01:18) |
| 109181 | Edenteg | Johan | M | Uppland | SE | 4 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 116257 | Edgcomb | John | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 118510 | Edgecombe | Charles | M | British Columbia | CA | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 115185 | Edgerton | Steve | M | AB | CA | 1 | Waldo 100km 2023 (18 hours) |
| 104962 | Edminster | Robert | M | UT | US | 16 | Bear, The 100M 2023 (36 hours) |
| 112292 | Edmiston | Brittany | F | Arizona | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 113872 | Edøy | Odd | M | Sunndal | NO | 2 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 108631 | Edward | Adler | M | CO | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 103088 | Edwards | Alina | F | CA | US | 4 | Waldo 100km 2023 (18 hours) |
| 118046 | Edwards | Hayden | M | Texas | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 107367 | Edwards | Jason | M | Utah | US | 4 | Bear, The 100M 2023 (36 hours) |
| 115183 | Edwards | Jonathan | M | CO | US | 1 | Never Summer 103km 2023 (23 hours) |
| 115385 | Edwards | Jonathan | M | UT | US | 1 | Never Summer 103km 2023 (23 hours) |
| 119164 | Edwards | Jonathan | M | Western Cape | ZA | 1 | Ultra-Trail Cape Town 100km 2022 (21 hours) |
| 106787 | Efta | Caleb | M | CO | US | 1 | Western States 100M 2023 (30 hours) |
| 116770 | Egan | Tom | M | FL | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 115917 | Egan Kearns | Phillip | M | OR | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 116108 | Egbert | Grant | M | Nevada | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 115859 | Eggert | Christopher | M | WA | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 110608 | Ehland | Sean | M | CA | US | 4 | Canyons by UTMB 100M 2023 (32 hours) |
| 112186 | Ehmann | Peter | M | NJ | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 114935 | Ehmann | Steven | M | VA | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 114501 | Ehrbaker | Toby | M | Maryland | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 104939 | Ehrhard | Ron | M | CA | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 116193 | Ehrnrooth | Rebeca | F | Select | GB | 1 | Grindstone 100M 2023 (38 hours) |
| 102917 | Eidukas | Saulius | M | OR | US | 2 | Siskiyou Outback 100km 2023 (17 hours) |
| 118171 | Eigenmann | Gabriel | M | Bern | CH | 1 | Ultra Trail Lago d'Orta 102km 2023 (24 hours) |
| 105096 | Eilenberg | Bryce | M | CA | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 117268 | Eisen | Andrew | M | NY | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 108909 | Eklöf | Jonas | M | Halland | SE | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104413 | Eklof | Klas | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 109827 | Ekman | Fredrik | M | Halland | SE | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 106282 | Elam | Jimmy | M | UT | US | 8 | High Lonesome 100M 2023 (37 hours) |
| 101447 | Elam | Matt | M | CO | US | 128 | Hardrock 100M 2023 (48 hours) |
| 111982 | Eldridge | Nick | M | Oregon | US | 1 | Western States 100M 2023 (30 hours) |
| 117493 | Eley | Serena | F | Washington | US | 1 | Grindstone 100M 2023 (38 hours) |
| 104081 | Elfving | Jesper | M | DNK | DK | 4 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 117293 | Elgar Nielsen | Kim | M | Esbjerg | DK | 1 | Zugspitz 111km 2023 (25 hours) |
| 117682 | Elgin | Matt | M | Texas | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 116391 | Elias | Megan | F | British Columbia | CA | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 117374 | Eller | Michael | M | Oregon | US | 1 | Pine to Palm 100M 2023 (34 hours) |
| 112519 | Ellerman | Rachel | F | WI | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 104260 | Elliott | Robert | M | ID | US | 8 | Bear, The 100M 2023 (36 hours) |
| 110273 | Elliott | Sean | M | Oxfordshire | GB | 2 | Race to the Stones 100km 2023 (17 hours) |
| 108023 | Elliott | Tom | M | Texas | US | 4 | HOKA Bandera 100km 2023 (17 hours) |
| 112448 | Ellis | Jill | F | QLD | AU | 2 | Guzzler Ultra 100km 2023 (24 hours) |
| 118459 | Ellis | Lincoln | M | AZ | US | 1 | Zion 100km 2023 (19 hours) |
| 118947 | Ellis | Morten | M | notts | GB | 1 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 107505 | Ellis | Shannon | F | MI | US | 4 | Eastern States 100M 2023 (36 hours) |
| 112658 | Ellis | Steve | M | SC | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 116128 | Ellison | Mark | M | CO | US | 1 | Never Summer 103km 2023 (23 hours) |
| 116752 | Ellison | Ross | M | CA | US | 1 | Tahoe 200 202M 2023 (100 hours) |
| 108194 | Ellwood | Graham | M | Wellington | NZ | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 101996 | Elmore | Chantal | F | CO | US | 8 | High Lonesome 100M 2023 (37 hours) |
| 116087 | Elmore | Justin | M | GA | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 108693 | Els | Nicholas | M | Free state | ZA | 2 | Ultra-Trail Cape Town 100M 2022 (45 hours) |
| 105308 | Elsaesser | Ralf | M | CA | US | 16 | Miwok 100km 2023 (15.5 hours) |
| 115010 | Eltherington | Reid | M | ON | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 116321 | Ely | Ron | M | MD | US | 1 | Cascade Crest 100M 2023 (35 hours) |
| 118622 | Embrey | Noah | M | NV | US | 1 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 104547 | Emis | Jon | M | CA | US | 32 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 113067 | Emmett | Tim | M | Missouri | US | 2 | Kettle Moraine 100M 2023 (30 hours) |
| 118416 | Emmons | Brian | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 113158 | Endicott | Adam | M | Texas | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 117115 | Endl | Matyas | M | Budapest | HU | 1 | Salomon Ultra-Trail Hungary 112km 2023 (20 hours) |
| 115188 | Endo | Tsukasa | M | IBARAKI pref | JP | 1 | SkyView Ultra Trail 140km 2023 (38 hours) |
| 116195 | Endsley | Chad | M | Ohio | US | 1 | Canal Corridor 100 100M 2023 (30 hours) |
| 106171 | Ene | Robert | M | GBR | GB | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 119101 | Eng | Alyson | F | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 110861 | Eng | Erik | M | Österåker | SE | 4 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 117524 | Eng | Kelsey | F | CT | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 100811 | Engel | Llewelyn | F | DC | US | 8 | Never Summer 103km 2023 (23 hours) |
| 108113 | England | Jerry | M | WA | US | 4 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 104595 | England | Mark | M | WI | US | 4 | Run Rabbit Run 100M 2023 (36 hours) |
| 103960 | England | Stephen | M | NY | US | 32 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 102038 | England | Tiffany | F | NY | US | 32 | Tarawera 100K 102km 2023 (17 hours) |
| 107658 | Englehart | Thomas | M | Ohio | US | 4 | Grindstone 100M 2023 (38 hours) |
| 102836 | English | Garrett | M | UT | US | 32 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 105505 | English | Nick | M | MT | US | 8 | Crazy Mountain 100M 2023 (36 hours) |
| 113223 | ENGLUND | TOM | M | Uppland | SE | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 100818 | Enlow | Lori | F | OK | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 100324 | Ennis-King | Jonathan | M | AUS | AU | 16 | Kosciusko by UTMB 100M 2022 (36 hours) |
| 109610 | Enrica | Gouthier | F | italy | IT | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 118409 | Entrekin | Rachel | F | California | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 113165 | Epifano | Steven | M | CA | US | 2 | Cocodona 250M 2023 (125 hours) |
| 108079 | Eppenbaugh | Sara | F | INDIANA | US | 4 | Mohican 100M 2023 (32 hours) |
| 118705 | Erbslöh | Torsten | M | NRW | DE | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116473 | Erekson | Jordan | M | Utah | US | 1 | Bear, The 100M 2023 (36 hours) |
| 115799 | Erickson | Anne | F | UT | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 102873 | Eriksen | Karl Johan | M | DNK | DK | 8 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 109824 | Eriksson | Sigurd | M | Trondelag | NO | 4 | Soria Moria til Verden Ende 100M 2023 (35 hours) |
| 101419 | Erlbacher-Anderson | Amy | F | NE | US | 8 | Gorge Waterfalls 100km 2023 (17 hours) |
| 117393 | Ermak | Alexej | M | Nordrhein Westfalen | DE | 1 | Morenic Trail 100km 2023 (22 hours) |
| 110048 | Erskine | Rob | M | CO | US | 2 | Bear, The 100M 2023 (36 hours) |
| 114561 | Erxleben | Chris | M | Oregon | US | 1 | Western States 100M 2023 (30 hours) |
| 116090 | Esbenshade | Cody | M | CO | US | 1 | Mohican 100M 2023 (32 hours) |
| 112688 | Esbenshade | Travis | M | Ohio | US | 2 | Mohican 100M 2023 (32 hours) |
| 118032 | Eshleman | Jeremy | M | Pennsylvania (PA) | US | 1 | Rim to River 100M 2023 (32 hours) |
| 101046 | Espino | Albert | M | CA | US | 8 | Cuyamaca 100km 2023 (17 hours) |
| 102462 | Espinosa | Diego | M | AZ | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 110175 | Espinosa Valdez | Cinthia | F | Mexico | MX | 4 | Mohican 100M 2023 (32 hours) |
| 112315 | Esposti | Nick | M | OR | US | 2 | Gorge Waterfalls 100km 2023 (17 hours) |
| 103126 | Esquivel | Alex | M | CA | US | 16 | Bighorn 100M 2023 (35 hours) |
| 112536 | Esson | Heather | F | OH | US | 2 | Massanutten 100M 2023 (36 hours) |
| 109009 | Estabrook | Eric | M | CA | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 115369 | Estéfano | Luis | M | Asturias | ES | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 110121 | Estipona | Matthew | M | CA | US | 2 | Rio Del Lago 100M 2023 (30 hours) |
| 102173 | Estler | Toby | M | WA | US | 8 | Miwok 100km 2023 (15.5 hours) |
| 103562 | Ettinghausen | Ed | M | CA | US | 16 | Oregon Cascades 100M 2023 (32:01:18) |
| 115483 | Eugster | Nick | M | MN | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 113731 | Eulaerts | Kevin | M | Vlaams-Brabant | BE | 2 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 109915 | Eury | Mark | M | CO | US | 4 | Wasatch Front 100M 2023 (36 hours) |
| 105533 | Evans | Dave | M | CA | US | 32 | Gorge Waterfalls 100km 2023 (17 hours) |
| 113648 | Evans | Garret | M | CA | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 115528 | Evans | Julian | M | Cheshire | US | 1 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 107568 | Evans | Matt | M | Kent | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 105053 | Evans | Ron | M | PA | US | 8 | Tunnel Hill 100M 2022 (30 hours) |
| 106792 | Evans | Russell | M | 2 | Kosciusko by UTMB 100M 2022 (36 hours) | ||
| 112290 | Evans | Sarah | F | CA | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 116434 | Evans | Steve | M | NSW | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 116091 | Eve | Ben | M | England | GB | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 105492 | Eveland | Christopher | M | TN | US | 1 | Western States 100M 2023 (30 hours) |
| 109858 | Evenson | Scott | M | North Carolina | US | 2 | Umstead 100M 2023 (30 hours) |
| 118556 | Everett | Meghan | F | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 111776 | Everhart | Brock | M | OH | US | 2 | Burning River 100M 2023 (30 hours) |
| 113072 | Evers | Steven | M | NV | US | 2 | Zion 100km 2023 (19 hours) |
| 116908 | Evers | Thomas | M | Nevada | US | 1 | Zion 100M 2023 (36 hours) |
| 108766 | Eversole | Sean | M | FL | US | 4 | HURT 100M 2023 (36 hours) |
| 107206 | Everson | David | M | Colorado | US | 4 | Bigfoot 206M 2023 (100 hours) |
| 118417 | Everton | Nikki | F | Hawkes Bay | NZ | 1 | Taupo 100k 100km 2023 (17 hours) |
| 104614 | Evison | Geoff | M | AUS | AU | 1 | Western States 100M 2023 (30 hours) |
| 102558 | Ewing | Andrew | M | CA | US | 2 | HURT 100M 2023 (36 hours) |
| 100542 | Ewing | Brett | M | CA | US | 32 | Sean O'Brien 100km 2023 (16 hours) |
| 116041 | Eyer | Mike | M | Colorado | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 111003 | Eyl | Mike | M | NC | US | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 108819 | Fabian | Carlo | M | Ohio | US | 4 | HOKA Bandera 100km 2023 (17 hours) |
| 118994 | Fabian | Zachary | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 109127 | Fabianich Mcclay | John | M | Ohio | US | 4 | Canal Corridor 100 100M 2023 (30 hours) |
| 115293 | Fabien | Sara | F | London | GB | 1 | West Highland Way 95M 2023 (30 hours) |
| 119149 | Fabrice | GORON | M | Tahiti | PF | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 109061 | Facchino | Carlo | M | CA | US | 2 | Rio Del Lago 100M 2023 (30 hours) |
| 114803 | Faeth | Emily | F | Ohio | US | 1 | Mohican 100M 2023 (32 hours) |
| 105305 | Fagan | Brian | M | TX | US | 8 | HOKA Bandera 100km 2023 (17 hours) |
| 105904 | Fagan | Von | M | IL | US | 8 | Bighorn 100M 2023 (35 hours) |
| 118775 | Fagundes | Mark | M | CA | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 103196 | Fahy | Timothy | M | CO | US | 64 | High Lonesome 100M 2023 (37 hours) |
| 116814 | Fairfield | Dylan | M | Illinois | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 108552 | Fairman | Jeffrey | M | Maryland | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 110855 | Fakes | Roger | M | TN | US | 1 | Zion 100M 2023 (36 hours) |
| 113591 | Fakler | Mike | M | Colorado | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 115854 | Falkenberg | Eike | M | California | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 113588 | Falker | Todd | M | MA | US | 2 | Brazos Bend 100M 2022 (30 hours) |
| 117150 | Fallon | Collin | M | TX | US | 1 | Tahoe 200 202M 2023 (100 hours) |
| 100881 | Fallon | Victor | M | CO | US | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117601 | Falzon | Jason | M | Texas | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 116475 | Fang | Anna | F | MA | US | 1 | Eiger Ultra Trail 101km 2023 (23 hours) |
| 115173 | FANG | ZHENGJIE | M | Zhejiang | CN | 1 | Ninghai Ultra Trail 109km 2023 (24 hours) |
| 106793 | Fannin | Tyler | M | Utah | US | 16 | Zion 100km 2023 (19 hours) |
| 106794 | Farina | Andy | M | 2 | Long Haul 100M 2023 (30 hours) | ||
| 116909 | Farishta | Raheem | M | CA | US | 1 | Quicksilver 100km 2023 (17 hours) |
| 119146 | Farlee | Todd | M | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 115143 | Farley | Andrea | F | QLD | AU | 1 | Blackall 100K 100km 2023 (18 hours) |
| 109351 | Farley | Jamie | M | CA | US | 4 | Fat Dog 120M 2023 (48 hours) |
| 114973 | Farmer | Carlita | F | NC | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 108317 | Farmers | Andrew | M | Sabah | MY | 2 | Bigfoot 206M 2023 (100 hours) |
| 118152 | Farmiga | Victor | M | Colorado | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 117260 | Farnsworth | Sam | M | MA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 107852 | Farnsworth | Sophia | F | Massachusetts | US | 1 | Western States 100M 2023 (30 hours) |
| 113753 | Farquhar | Carey | F | WA | US | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 117109 | farrell | gerry | M | Cork | IE | 1 | Kerry Way Ultra 193km 2023 (40 hours) |
| 119109 | Farrell | John | M | conwy | GB | 1 | Race to the Stones 100km 2023 (17 hours) |
| 112240 | Farrell | Kristii | N | North Carolina | US | 2 | Yeti (Virginia) 100M 2023 (30 hours) |
| 114617 | Farrell | Shelby | F | CT | US | 1 | Rim to River 100M 2023 (32 hours) |
| 109030 | Farris | John | M | TX | US | 1 | Bear, The 100M 2023 (36 hours) |
| 112803 | Farris | Josh | M | wa | US | 2 | Bigfoot 206M 2023 (100 hours) |
| 101244 | Farvard | Rod | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 116187 | Faryadi | Jonathan | M | NC | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 117911 | Fasl | Joseph | M | New York | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 111623 | Fatigante | Michael | M | PA | US | 2 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 107953 | Fatland | Anson | M | WA | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 111050 | Fatti | Kali | F | New York | US | 1 | Bear, The 100M 2023 (36 hours) |
| 100635 | Faught | David | M | ID | US | 32 | Gorge Waterfalls 100km 2023 (17 hours) |
| 106795 | Faul | Justin | M | 16 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) | ||
| 100419 | Fauser | Fabrice | M | CHE | CH | 4 | Trail Alsace Grand Est by UTMB - Ultra-Trail des Chevaliers 173km 2023 (40 hours) |
| 118992 | Favero | Alessandro | M | Treviso | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 113864 | Favro | Chris | M | GA | US | 2 | Pinhoti 100M 2023 (31 hours) |
| 112020 | Fazio | Danielle | F | CA | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 110908 | Fazio | Jason | M | Ca | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 113707 | Fazio | Paul | M | UT | US | 2 | Wasatch Front 100M 2023 (36 hours) |
| 100379 | Fearing | Aaron | M | WI | US | 8 | Hennepin 100M 2023 (30 hours) |
| 116231 | Fearnall | Adam | M | New Brunswick | CA | 1 | Quebec Mega Trail 100M 2023 (40 hours) |
| 111725 | Feather | Aaron | M | PA | US | 2 | Eastern States 100M 2023 (36 hours) |
| 112714 | Febbo | Salvatore | M | Western Australia | AU | 2 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 108586 | Febbraro | Amber | F | CO | US | 4 | Canyons by UTMB 100km 2023 (18 hours) |
| 117796 | Feeney | James | M | New York | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 117549 | Feeny | James | M | MI | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 103041 | Fegyveresi | John | M | AZ | US | 1 | Western States 100M 2023 (30 hours) |
| 116869 | Feher | Andrew | M | Pennsylvania | US | 1 | Worlds End 100km 2023 (19 hours) |
| 112869 | Fehr | Ty | M | Alberta | CA | 2 | Canadian Death Race 125km 2023 (24 hours) |
| 105192 | Feinhaus | Dima | M | MA | US | 8 | Javelina Jundred 100M 2023 (30 hours) |
| 112864 | Felczerek | Mariusz | M | South Yorkshire | GB | 2 | South Downs Way 100M 2023 (30 hours) |
| 101106 | Feldman | Angela | F | AZ | US | 1 | Western States 100M 2023 (30 hours) |
| 100897 | Feldman | Neil | M | MA | US | 128 | Twisted Branch 100km 2023 (20 hours) |
| 117610 | Felicetti | Luca | M | Trentino | IT | 1 | Abbots Way 125km 2023 (28 hours) |
| 102556 | Felix | Rick | M | AZ | US | 8 | Javelina Jundred 100M 2023 (30 hours) |
| 116916 | Feller | Brittany | F | Utah | US | 1 | Zion 100M 2023 (36 hours) |
| 117893 | Felsen | Jonathan | M | CA | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 118801 | Felton | Matthew | M | CO | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 117848 | FENG | RONGHUANG | M | GUANGXI | CN | 1 | Hong Kong 100K 100km 2023 (23 hours) |
| 111494 | Feng | Wei | M | Singapore | SG | 2 | Cameron Ultra-Trail 100km 2023 (28 hours) |
| 118983 | Fenn | Alex | M | NC | US | 1 | Umstead 100M 2023 (30 hours) |
| 116377 | Fenn | Samuel | M | London | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 108025 | Fenton | Owen | M | Cork | IE | 4 | Kerry Way Ultra 193km 2023 (40 hours) |
| 104789 | Ferbitz | Lars | M | CHE | CH | 4 | Eiger Ultra Trail 101km 2023 (23 hours) |
| 115800 | Ferdinand | Nicholas | M | Mi | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 118589 | Ferdinandson | Adam | M | CO | US | 1 | Bighorn 100M 2023 (35 hours) |
| 118022 | Fergot | Gregg | M | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 107668 | Ferguson | Joshua | M | Maryland | US | 4 | Massanutten 100M 2023 (36 hours) |
| 107182 | Ferguson | Michael | M | NB | CA | 2 | Zion 100km 2023 (19 hours) |
| 113659 | Ferguson | Ross | M | Queensland | AU | 2 | Guzzler Ultra 100km 2023 (24 hours) |
| 115095 | Ferguson | Ross | M | Gauteng | ZA | 1 | Ultra-Trail Cape Town 100km 2022 (21 hours) |
| 118438 | Ferguson | Stan | M | AR | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 110083 | Ferguson | Tiffany | F | CA | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 118394 | Fernandez | Christian | M | Utah | US | 1 | Wasatch Front 100M 2023 (36 hours) |
| 110933 | Fernandez | Cristian | M | San Jose | CR | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 104707 | Fernandez | Gerome | M | FRA | FR | 4 | Nice Côte d'Azur by UTMB 159km 2023 (48 hours) |
| 118487 | Fernandez | Mariana | F | Mendoza | AR | 1 | Ultra Trail Amanecer Comechingón 116km 2023 (32 hours) |
| 109465 | Fernandez | Roger | M | Ile de France | FR | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 106315 | Fernandez | Tatiana | F | GA | US | 2 | Zion 100M 2023 (36 hours) |
| 117445 | Fernandez Jara | Alonso José | M | San jose | CR | 1 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 115708 | Fernando | Mindy | F | Michigan | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 115289 | Ferrante | Marco | M | BZ | IT | 1 | Tuscany Crossing 103km 2023 (21 hours) |
| 114273 | Ferrari | Francesco | M | Lombardia | IT | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 100711 | Ferree | Eric | M | PA | US | 4 | Eastern States 100M 2023 (36 hours) |
| 116239 | FERREIRA FILHO | IDALINO | M | MINAS GERAIS | BR | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 117339 | Ferrero | Maria Carla | F | TO | IT | 1 | South Downs Way 100M 2023 (30 hours) |
| 114191 | Ferret | Kevin | M | California | US | 2 | Miwok 100km 2023 (15.5 hours) |
| 118323 | FERRIER | Edwige | F | État fédéral :* | FR | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 107730 | Ferrier | Nathan | M | MI | US | 4 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 109316 | Ferriol | Xyrus | M | CA | US | 2 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 113274 | Ferro | Matthew | M | Texas | US | 2 | HOKA Bandera 100km 2023 (17 hours) |
| 117676 | Ferry | Luke | M | NSW | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 105482 | Fersch | Sascha | M | DEU | DE | 8 | Zugspitz 111km 2023 (25 hours) |
| 114043 | Festival | Mario | M | AB | CA | 2 | Lost Soul Ultra 100km 2023 (21 hours) |
| 111215 | Fetters | Brad | M | FL | US | 1 | Long Haul 100M 2023 (30 hours) |
| 104422 | Fetting | Mark | M | PA | US | 4 | Grindstone 100km 2023 (18 hours) |
| 109696 | Fetting | Stan | M | Queensland | AU | 2 | Blackall 100K 100km 2023 (18 hours) |
| 108288 | Fetzer | Dan H | M | Utah | US | 4 | Wasatch Front 100M 2023 (36 hours) |
| 103316 | Fetzer | Jerry | M | CA | US | 64 | San Diego 100M 2023 (32 hours) |
| 104139 | Feustel | Troy | M | MN | US | 4 | Superior 100 100M 2023 (38 hours) |
| 101833 | Fiandaca | Benjamin | M | NH | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 105038 | Fiandeiro | Louis | M | CA | US | 16 | Black Canyon 100km 2023 (17 hours) |
| 104510 | Fiandeiro | Stefan | M | CA | US | 16 | Quicksilver 100km 2023 (17 hours) |
| 107354 | Fichtner | kristie | F | Michigan | US | 4 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 118206 | Fidalgo | Tino | M | MA | US | 1 | Rim to River 100M 2023 (32 hours) |
| 117867 | Fiege-Kollmann | Kyle | M | Washington | US | 1 | Waldo 100km 2023 (18 hours) |
| 117194 | Field | David | M | Bedfordshire | GB | 1 | Thames Path 100 100M 2023 (28 hours) |
| 108434 | field | troy | M | Auckland | NZ | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 111392 | Fiene | Jonathan | M | Baden-Württemberg | DE | 2 | Eiger Ultra Trail 101km 2023 (23 hours) |
| 104374 | Fiessinger | Christophe | M | WA | US | 8 | Gorge Waterfalls 100km 2023 (17 hours) |
| 115457 | Fifer | Tom | M | IN | US | 1 | Indiana 100M 2023 (30 hours) |
| 105490 | Figgins | Troy | M | CA | US | 64 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 111265 | Figueroa | Justin | M | Indiana | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 116880 | Fike | Laura | F | PA | US | 1 | Eastern States 100M 2023 (36 hours) |
| 108480 | File | Balázs | M | Pest | HU | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116727 | Filer | Chris | M | Buckinghamshire | GB | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 116103 | Files | Adam | M | FL | US | 1 | No Business 100M 2023 (33.5 hours) |
| 115124 | Fimple | Misty | F | Nevada | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 115497 | Findley | Craig | M | IN | US | 1 | Indiana 100M 2023 (30 hours) |
| 114280 | Finegan | Oran | M | Geneva | CH | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 104101 | Finegan | Sean | M | CA | US | 32 | Cuyamaca 100km 2023 (17 hours) |
| 100243 | Finger | Joshua | M | PA | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 102576 | Fink | Michael | M | CA | US | 4 | Canyons by UTMB 100km 2023 (18 hours) |
| 105361 | Finkbeiner | Christian | M | NV | US | 4 | Leadville Trail 100M 2023 (30 hours) |
| 109431 | Finn | Charles | M | WA | US | 4 | Canyons by UTMB 100km 2023 (18 hours) |
| 108952 | Finn-Atkins | Alexandra | F | New York | US | 2 | Burning River 100M 2023 (30 hours) |
| 108462 | Finocchio | Tim | M | MA | US | 4 | Ultra Tour Monte Rosa 170km 2023 (60 hours) |
| 118795 | Fioretti | Mirko | M | Italy | US | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 104165 | Fioroni | Gina | F | CO | US | 4 | Bighorn 100M 2023 (35 hours) |
| 114087 | Firmeza | Washington | M | QLD | AU | 2 | Scott TMBT 109km 2023 (30 hours) |
| 102229 | Fischel | Scott | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 109110 | Fischer | Jody | M | QLD | AU | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 101223 | Fischer | Katherine | F | CA | US | 8 | Tahoe 200 202M 2023 (100 hours) |
| 119106 | Fischer | Lauren | N | WA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 102775 | Fisher | Casey | M | MD | US | 4 | Massanutten 100M 2023 (36 hours) |
| 116677 | Fisher | Charlotte | F | Other | GB | 1 | North Downs Way 100M 2023 (30 hours) |
| 118899 | Fisher | Frank | M | TX | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 117998 | Fisher | Jacob | M | CO | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 118354 | Fisher | Joanne | F | FL | US | 1 | Long Haul 100M 2023 (30 hours) |
| 109346 | Fisher | Marta | U | OR | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 117390 | Fisher | Nathan | M | California | US | 1 | San Diego 100M 2023 (32 hours) |
| 112285 | Fisher | Will | M | CO | US | 2 | IMTUF 100M 2023 (36 hours) |
| 116058 | Fisk | Emily | F | PA | US | 1 | Eastern States 100M 2023 (36 hours) |
| 114558 | Fisker | Peter | M | Viborg | DK | 2 | Gran Trail Courmayeur 100km 2023 (28 hours) |
| 114924 | Fitchet | Rubert | M | Western cape | ZA | 1 | Ultra-Trail Cape Town 100M 2022 (45 hours) |
| 100321 | Fitz | John | M | MD | US | 16 | Grindstone 100km 2023 (18 hours) |
| 111893 | Fitzgerald | Michael | M | PA | US | 1 | Western States 100M 2023 (30 hours) |
| 117836 | Fjose | Fredrik | M | Vestland | US | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 112897 | Fladhammer | James | M | Wisconsin | US | 2 | Kettle Moraine 100M 2023 (30 hours) |
| 114940 | Flagler | Grant | M | Alberta | CA | 1 | Quebec Mega Trail 110km 2023 (22 hours) |
| 100378 | Flake | Christoph | M | DEU | DE | 16 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 117823 | Flament | Arnaud | M | SA | AU | 1 | Kosciusko by UTMB 100km 2022 (18 hours) |
| 102214 | Flanagan | Brandon | M | OR | US | 8 | Waldo 100km 2023 (18 hours) |
| 118072 | Flanagan | Gill | M | Ky | US | 1 | No Business 100M 2023 (33.5 hours) |
| 119137 | Flanagan | Travis | M | TX | US | 1 | Brazos Bend 100M 2022 (30 hours) |
| 107553 | Flanary | James | M | CO | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 116070 | Flanders | Erin | F | CO | US | 1 | Bighorn 100M 2023 (35 hours) |
| 116856 | Flanegin | Kevin | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 116762 | Flannery | Jared | M | MN | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 100532 | Flannery | Kevin | M | CO | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 105660 | Flannery | Moira | F | UT | US | 16 | Beaverhead 100km 2023 (20 hours) |
| 113282 | Flatman | Danielle | F | Auckland | NZ | 2 | Taupo 100k 100km 2023 (17 hours) |
| 115970 | Fleeger | Kevin | M | FL | US | 1 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 112047 | Fleisher | Aaron | M | CA | US | 2 | Cocodona 250M 2023 (125 hours) |
| 114802 | Fleming | Gabriel | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 112701 | Fleming | Margot | F | CA | US | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 117757 | Flenner | Elijah | M | CO | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 101655 | Flesch | Tara | F | IA | US | 2 | Kettle Moraine 100M 2023 (30 hours) |
| 109063 | Fletcher | Matt | M | UT | US | 1 | Western States 100M 2023 (30 hours) |
| 117386 | Fletcher | Matt | M | TX | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 100638 | Fletes | Sinuhe | M | MEX | MX | 32 | Puerto Vallarta México by UTMB 100km 2023 (18 hours) |
| 102403 | Flinders | Mary | F | WA | US | 16 | Oregon Cascades 100M 2023 (32:01:18) |
| 109593 | Flink | Brian | M | CO | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 114004 | Flinn | Emily | F | Pa | US | 2 | No Business 100M 2023 (33.5 hours) |
| 116624 | Flodmand | Derek | M | NM | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 109636 | Flores | Luis | M | CA | US | 2 | Rio Del Lago 100M 2023 (30 hours) |
| 110728 | Florian | Sergio | M | Hawaii | US | 4 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 113776 | Floridia | Fabrizio | M | ITALIA | IT | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 102805 | Flowerday | Crispin | M | CA | US | 2 | Sean O'Brien 100km 2023 (16 hours) |
| 115893 | Floyd | Ryan | M | Ohio | US | 1 | Mohican 100M 2023 (32 hours) |
| 116359 | Flynn | Aaron | M | CA | US | 1 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 116419 | Flynn | Bracken | M | CA | US | 1 | Siskiyou Outback 100km 2023 (17 hours) |
| 111734 | Flynn | David | M | GA | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 112632 | Foerster | Andrew | M | PA | US | 2 | No Business 100M 2023 (33.5 hours) |
| 109270 | Foessel | Benjamin | M | Queensland | AU | 4 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 119010 | Fogelmark | Johan | M | Stockholm | SE | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 108791 | Foglia | Ivan | M | Parma | IT | 4 | Abbots Way 125km 2023 (28 hours) |
| 104858 | Foley | Christopher | M | WI | US | 4 | Indiana 100M 2023 (30 hours) |
| 106230 | Folkert | Darrel | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 113581 | Follmar | Amanda | F | California | US | 2 | Rio Del Lago 100M 2023 (30 hours) |
| 112888 | Folscheid | Guillaume | M | Bavaria | DE | 2 | Zugspitz 111km 2023 (25 hours) |
| 109015 | Fones | Madeline | F | CO | US | 2 | Bighorn 100M 2023 (35 hours) |
| 116455 | Fong | Dawn | F | Greater Manchester | GB | 1 | Race to the Stones 100km 2023 (17 hours) |
| 110060 | Fonseca | Traci | F | CA | US | 4 | Rio Del Lago 100M 2023 (30 hours) |
| 117564 | Fontaine | Alexandre | M | Haute Savoie | US | 1 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 109147 | Fontaine | Anthony | M | Quebec | CA | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118467 | Fontenay | Clément | M | Puy de Dôme | FR | 1 | Trail Alsace Grand Est by UTMB - Ultra-Trail des Chevaliers 173km 2023 (40 hours) |
| 118327 | Fonteneau | Yoann | M | France | FR | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 102389 | Forbes | Timothy | M | TN | US | 16 | Rim to River 100M 2023 (32 hours) |
| 116777 | Forcier | Rich | M | Alberta | CA | 1 | Lost Soul Ultra 100km 2023 (21 hours) |
| 109252 | Ford | Isaiah | M | AZ | US | 1 | Western States 100M 2023 (30 hours) |
| 108749 | Ford | Russell | M | TX | US | 4 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 117226 | Ford | Tyler | M | Virginia | US | 1 | Grindstone 100M 2023 (38 hours) |
| 109938 | Forehand | Christina | F | CA | US | 4 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 100860 | Foreman | Gary | M | AZ | US | 8 | Bighorn 100M 2023 (35 hours) |
| 115374 | Forest | Stephan | M | Kanagawa | JP | 1 | Transjeju International Trail Run 112km 2023 (27 hours) |
| 111103 | Forman | Jared | M | CA | US | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 112007 | Forman | Ryan | M | TX | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 119102 | Fornasier | Fausto | M | Italy | IT | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118290 | Fornataro | Robert | M | NY | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 111181 | FORNELLI | Giacomo | M | Torino | IT | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 103586 | Forneris | Piercarlo | M | ITA | IT | 4 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 100895 | Foroughi | Jaclyn | F | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 118805 | Forshaw | Matthew | M | PA | US | 1 | Laurel Highlands 70.5M 2023 (20 hours) |
| 105429 | Forsström | Markus | M | SWE | SE | 2 | Transgrancanaria 125km 2023 (28 hours) |
| 117190 | Forster | Guy | M | Cambridgeshire | GB | 1 | Thames Path 100 100M 2023 (28 hours) |
| 112468 | Fortenberry | Ryan | M | KY | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 107673 | Fortin | Brenda | F | Massachusetts | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 114243 | Fortin | Charles | M | Quebec | CA | 2 | Grindstone 100km 2023 (18 hours) |
| 106623 | Fortin | Matthieu | M | QC | CA | 8 | Quebec Mega Trail 110km 2023 (22 hours) |
| 114639 | Fortin | Rick | M | California | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 115017 | Fortin | Sylvie | F | Quebec | CA | 1 | No Business 100M 2023 (33.5 hours) |
| 113440 | Foster | Jon | M | VA | US | 2 | Massanutten 100M 2023 (36 hours) |
| 113715 | Foster | Michael | M | TX | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 111760 | Foster | Shawn | M | London | GB | 2 | Autumn 100M 2023 (28 hours) |
| 106011 | Foster | Stephen | M | MO | US | 1 | Western States 100M 2023 (30 hours) |
| 107987 | Fotheringham | Alannah | F | ON | CA | 4 | Black Canyon 100km 2023 (17 hours) |
| 110875 | Fouillot | Nicolas | U | Rhône alpes | FR | 4 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 115338 | Fournier | Yanick | M | QC | CA | 1 | Grindstone 100M 2023 (38 hours) |
| 103114 | Fowler | Phillip | M | AUS | AU | 32 | Guzzler Ultra 100km 2023 (24 hours) |
| 112528 | Fowlkes | Jonathan | M | Mt | US | 2 | Bighorn 100M 2023 (35 hours) |
| 112970 | fox | kyle | M | Ca | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 107709 | Fox | Nelle | F | VA | US | 2 | Hellgate 100km 2022 (17 hours) |
| 114536 | Fox | Rachael | F | NSW | AU | 2 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 118998 | Fox | Samuel | M | Westmeath | US | 1 | South Downs Way 100M 2023 (30 hours) |
| 114135 | Fox | Stacy | M | CA | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 103513 | Fox | Wallly | M | OR | US | 8 | Oregon Cascades 100M 2023 (32:01:18) |
| 111548 | Fozzard | Tim | M | Cheshire | GB | 2 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 109956 | Fracchia | Kristin | F | CA | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 100071 | Fraga | Tara | F | WA | US | 8 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 116170 | Fragoso | Jill | F | LA | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 114787 | Frain | Michael | M | London | GB | 1 | Salomon Cappadocia Ultra-Trail 119km 2023 (23 hours) |
| 114012 | Franchi | Trevor | M | CA | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 109650 | Francis | Alex | M | WI | US | 2 | Grindstone 100M 2023 (38 hours) |
| 117358 | Francis | Helen | F | Ontario | CA | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 111156 | Francisco | Celso Jr | M | Capiz | PH | 2 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 102315 | Francisco | Cris | M | CA | US | 4 | Cuyamaca 100km 2023 (17 hours) |
| 101558 | Frank | Daniel | M | MD | US | 8 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 111658 | Frank | Isaac | M | CO | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 102801 | Frankel | Joshua | M | NY | US | 8 | Worlds End 100km 2023 (19 hours) |
| 113180 | Franklin | Dan | M | Waikato | NZ | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 118904 | Franklin | Tyler | M | OR | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 119065 | Franks | Patrick | M | Queensland | AU | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 111503 | Frantzen | Marc | M | NRW | DE | 2 | Trail Alsace Grand Est by UTMB - Ultra-Trail des Païens 109km 2023 (21 hours) |
| 112758 | Franzen | Bryan | M | ARIZONA | US | 2 | San Diego 100M 2023 (32 hours) |
| 118783 | Franzetti | Jacopo | M | Lombardia | IT | 1 | Gran Trail Courmayeur 100km 2023 (28 hours) |
| 116690 | Frazier | Alexander | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 108068 | Frazier | Kyle | M | TX | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 115121 | Fréchette | Guillaume | M | BY | DE | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 102459 | Frederick | Doug | M | MI | US | 4 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 116228 | Frederick | Kaylee | F | Pennsylvania | US | 1 | Eastern States 100M 2023 (36 hours) |
| 110077 | Frederiksen | Claus Ellgaard | M | Nordjylland | DK | 4 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 105122 | Freeman | Gordon | M | OR | US | 256 | Pine to Palm 100M 2023 (34 hours) |
| 104327 | Freeman | Molly | F | GA | US | 16 | Miwok 100km 2023 (15.5 hours) |
| 116432 | Freer | Jada | F | WA | US | 1 | Umstead 100M 2023 (30 hours) |
| 111092 | Frehe | Mark | M | FL | US | 2 | Long Haul 100M 2023 (30 hours) |
| 114538 | Frei | Patrick | M | Bern | US | 2 | Eiger Ultra Trail 101km 2023 (23 hours) |
| 102520 | Freitag | Michael | M | DEU | DE | 16 | Istria by UTMB 168km 2023 (46 hours) |
| 104526 | French-Owen | Calvin | M | CA | US | 8 | Canyons by UTMB 100km 2023 (18 hours) |
| 117414 | Frentzel | Jonathan | M | Delaware | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 115867 | Fretwell | Crystal | F | WA | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 112943 | Frey | Dominique | M | Zurich | CH | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 101498 | Frey | Dustin | M | IN | US | 8 | Gorge Waterfalls 100km 2023 (17 hours) |
| 111358 | Frey | Jonathan | M | NC | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 118588 | Frey | Joshua | M | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 112487 | Freymiller | Beth | F | Minnesota | US | 2 | Bear, The 100M 2023 (36 hours) |
| 115777 | Fridrichova | Jana | F | MD | US | 1 | Hellgate 100km 2022 (17 hours) |
| 117884 | Friedel | Samantha | F | Texas | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 107408 | friedman | Jason | M | NJ | US | 4 | Fat Dog 120M 2023 (48 hours) |
| 112871 | Friedt | Tim | M | Rheinland Pfalz | DE | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 111355 | Friesen | Jared | M | Wa | US | 2 | Cascade Crest 100M 2023 (35 hours) |
| 103550 | Friess | Mark | M | OR | US | 8 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 109114 | Frigeri | Mattia | M | Parma | IT | 4 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 112966 | Frigon | Samuel | M | Québec | CA | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117868 | Frisch | László | M | Heves | HU | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 104425 | Fritsch | Jackie | F | MD | US | 4 | Bear, The 100M 2023 (36 hours) |
| 102507 | Fritz | Aaron | M | TX | US | 8 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 103441 | Fritz | Eric | M | AL | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 117562 | Fritz | Tobias | M | Tirol | AT | 1 | Grossglockner UltraTrail 110km 2023 (28 hours) |
| 103416 | Frizzle | Craig | M | BC | CA | 8 | Cascade Crest 100M 2023 (35 hours) |
| 119037 | Froidevaux | Elliot | M | None | HK | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 117818 | Fromm | Charles | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 107326 | Fronczek | Eric | M | OH | US | 4 | Burning River 100M 2023 (30 hours) |
| 114130 | Fronteras | Karen | F | Devon | GB | 2 | Lakeland 100M 2023 (40 hours) |
| 117755 | Frost | Steen | M | South Denmark | DK | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 117874 | Fruehauf | Urs | M | Hessen | DE | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118301 | Frydrych | Sarah | F | Colorado | US | 1 | Never Summer 103km 2023 (23 hours) |
| 109079 | Frye | Adam | M | WA | US | 4 | Cascade Crest 100M 2023 (35 hours) |
| 103961 | Fuentes | Ernesto | M | MEX | MX | 32 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 109116 | Fuentes Rivera | Hector | M | San Salvador | SV | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117170 | Fugere | Trevin | M | TX | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 115883 | Fuhrmann | Greg | M | Texas | US | 1 | Zion 100km 2023 (19 hours) |
| 100512 | Fujieda | Itaru | M | MD | US | 1 | Western States 100M 2023 (30 hours) |
| 117342 | Fujimura | Satomi | F | Hawaii | US | 1 | HURT 100M 2023 (36 hours) |
| 101098 | Fujioka | Masazumi | M | WA | US | 16 | IMTUF 100M 2023 (36 hours) |
| 108419 | Fujishiro | Kiyo | M | Kanagawa | JP | 4 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 115205 | FUJIWARA | TAKESHI | M | Chiba | JP | 1 | OSJ Ontake 100km 2023 (16 hours) |
| 115259 | FUKUDA | HIROKI | M | 東京都 | JP | 1 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 115584 | fukui | yoshikazu | M | tokyo | JP | 1 | Shinetsu Five Mountains Trail 100M 2023 (33 hours) |
| 117723 | Fulbright | Chris | M | NC | US | 1 | Grindstone 100km 2023 (18 hours) |
| 114141 | Fuller | Allen | M | AL | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 103275 | Fuller | Andrew | M | AUS | AU | 8 | Zion 100km 2023 (19 hours) |
| 116831 | Fuller | Ian | M | OR | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 110571 | Fuller | Josh | M | Wyoming | US | 2 | Hardrock 100M 2023 (48 hours) |
| 109008 | Fuller | Michael | M | Minnesota | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 118021 | Fuller | Stephen | M | Cornwall | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 107214 | Fullerton | Andrew | M | OK | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 107635 | Fulton | Alan | M | ms | US | 4 | Pinhoti 100M 2023 (31 hours) |
| 100706 | Fumero | Luigi | M | GBR | GB | 2 | Thames Path 100 100M 2023 (28 hours) |
| 115163 | Funayama | Yousuke | M | Tokyo | JP | 1 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 102205 | Fung | Billy | M | NZL | NZ | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 101007 | Fung | Leo | M | AB | CA | 2 | Cocodona 250M 2023 (125 hours) |
| 119148 | Funk | Jonathan | M | CA | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 115633 | Funke | Aaron | M | Utah | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 110744 | Furey | Conor | M | Alberta | CA | 4 | Canyons by UTMB 100km 2023 (18 hours) |
| 109935 | Furlotte | Lee | M | Alberta | CA | 2 | Canadian Death Race 125km 2023 (24 hours) |
| 115490 | Furstenau | Cody | M | ND | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 115579 | FURUDATE | Manabu | M | Ibaraki | JP | 1 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 103648 | Furukawa | Hideaki | M | Osaka-fu | JP | 4 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 117244 | Fussell | Scott | M | CO | US | 1 | Never Summer 103km 2023 (23 hours) |
| 105629 | Futterer | Chris | M | CA | US | 16 | Cuyamaca 100km 2023 (17 hours) |
| 116137 | Fyfe | Alex | M | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 104954 | Gabbe | Charles | M | CA | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 103528 | Gabrielse | Austin | M | CA | US | 8 | Never Summer 103km 2023 (23 hours) |
| 118831 | Gaerlan | Justin | M | CA | US | 1 | Pine to Palm 100M 2023 (34 hours) |
| 108589 | Gaffney | Erica | F | PA | US | 4 | Rim to River 100M 2023 (32 hours) |
| 119126 | Gage | Sarah | F | New Mexico | US | 1 | Grindstone 100km 2023 (18 hours) |
| 116706 | Gagel | Christian | M | CA | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 101759 | Gagliardi | Michael | M | PA | US | 16 | Javelina Jundred 100M 2023 (30 hours) |
| 109561 | Gagne | Eric | M | Quebec | CA | 4 | Black Canyon 100km 2023 (17 hours) |
| 117794 | Gagnon | Francis | M | Québec | CA | 1 | Quebec Mega Trail 110km 2023 (22 hours) |
| 105291 | Gagnon | Joseph | M | NY | US | 16 | Bighorn 100M 2023 (35 hours) |
| 113948 | Gagnon | Nanette Rosie | F | VA | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 109968 | Gaide | Matt | M | CA | US | 4 | Canyons by UTMB 100M 2023 (32 hours) |
| 114694 | Gainer | Eric | M | NC | US | 1 | Umstead 100M 2023 (30 hours) |
| 104571 | Gaiser | Scott | M | MT | US | 1 | Western States 100M 2023 (30 hours) |
| 104901 | Gaitten | Joseph | M | OH | US | 16 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 104104 | Galasso | Alex | M | NJ | US | 4 | Bighorn 100M 2023 (35 hours) |
| 105704 | Galbraith | Justin | M | IL | US | 4 | Kettle Moraine 100M 2023 (30 hours) |
| 111866 | Gale | Ben | M | IN | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 109230 | Gale | Travis | M | KZN | ZA | 2 | Ultra-Trail Cape Town 100M 2022 (45 hours) |
| 112842 | Galioni | Orion | M | Ca | US | 2 | Quicksilver 100km 2023 (17 hours) |
| 111138 | Gall | Josh | M | Colorado | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 107325 | Gallagher | Robert | M | Ma | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 100912 | Gallant | Marc | M | NB | CA | 16 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 113355 | Gallart | Enric | M | Lleida | ES | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 109378 | Gallay | Arnaud | F | Rhones-Alpes | FR | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 112939 | Galle | Matthew | M | NY | US | 2 | Canyons by UTMB 100M 2023 (32 hours) |
| 100276 | Gallegos | Ventura | M | TX | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 101248 | Gallitano | Joseph | M | PA | US | 2 | Ultra Trail Vipava Valley 106km 2023 (25 hours) |
| 105689 | Galloway | Carson | M | IA | US | 64 | Javelina Jundred 100M 2023 (30 hours) |
| 103956 | Galloway | David | M | NC | US | 128 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 102304 | Galope | Megan | F | AZ | US | 16 | Beaverhead 100km 2023 (20 hours) |
| 106647 | Galouzeau De Villepin | Thibault | M | NY | US | 2 | Kosciusko by UTMB 100M 2022 (36 hours) |
| 104830 | Galvan | Abraham | M | CA | US | 4 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 113829 | Galvez | David | M | CA | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 109304 | Gamble | Brian | M | TX | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 116719 | Gamble | Geoff | M | Ontario | CA | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 118377 | Gamette | Rochelle | F | ca | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 115421 | Gamito baus | Jordi | M | Spain | ES | 1 | Grossglockner UltraTrail 110km 2023 (28 hours) |
| 100083 | Gammon | Jack | M | GBR | GB | 32 | Race to the Stones 100km 2023 (17 hours) |
| 107989 | Gampp | Michael | M | OH | US | 2 | Mohican 100M 2023 (32 hours) |
| 115072 | Gandee | Mary | F | AZ | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 108423 | Gandhi | Aum | M | CA | US | 4 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 112333 | Gandhi | Karthikeyan | M | California | US | 2 | Bear, The 100M 2023 (36 hours) |
| 116297 | Gannon | Megan | F | WI | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 118488 | Gant | Rick | M | WA | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 116589 | Ganz | Taylor | F | WA | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 116158 | GAO | FEI | F | New York | US | 1 | Bear, The 100M 2023 (36 hours) |
| 101259 | Gapp | Nick | M | MI | US | 8 | Mohican 100M 2023 (32 hours) |
| 116376 | Garaj | Michal | M | Slovakia | SK | 1 | Letecka Stovka 104km 2023 (22 hours) |
| 117989 | Garand | Marc-Olivier | M | Quebec | CA | 1 | Quebec Mega Trail 100M 2023 (40 hours) |
| 115760 | Garber | Ryan | M | Virginia | US | 1 | Bighorn 100M 2023 (35 hours) |
| 118465 | Garces | Kalani | M | Washington | US | 1 | Cascade Crest 100M 2023 (35 hours) |
| 103698 | Garcia | Alejandro | M | PA | US | 4 | Grindstone 100M 2023 (38 hours) |
| 103067 | Garcia | Antonio | M | MEX | MX | 1 | Western States 100M 2023 (30 hours) |
| 118061 | Garcia | Cameron | M | Virginia | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 113951 | Garcia | Diego | M | RM | CL | 2 | Leadville Trail 100M 2023 (30 hours) |
| 111229 | García | Felipe | M | Andalucia | ES | 2 | Gran Trail Pe√±alara 110km 2023 (25 hours) |
| 118090 | Garcia | Fernando | M | CA | US | 1 | San Diego 100M 2023 (32 hours) |
| 104076 | Garcia | German | M | TX | US | 1 | Western States 100M 2023 (30 hours) |
| 107715 | Garcia | Luis | M | CA | US | 4 | Sean O'Brien 100km 2023 (16 hours) |
| 114443 | Garcia | Patrick | M | CO | US | 2 | Waldo 100km 2023 (18 hours) |
| 100426 | Garcia | Paul | M | IL | US | 1 | Western States 100M 2023 (30 hours) |
| 118798 | Garcia | Ramiro | M | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 114962 | Garcia de los Salmones | Azara | F | Cantabria | ES | 1 | Val d'Aran by UTMB, Camins de Hèr 105km 2023 (26 hours) |
| 110141 | GARCIA MESA | JOSE MANUEL | M | Andalucia | ES | 4 | Val d'Aran by UTMB, Camins de Hèr 105km 2023 (26 hours) |
| 118891 | Garcia rodriguez | rafa | M | Ciudad Real | ES | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 111445 | García Rojano | Raul | M | Mönchaltorf | US | 2 | Ultra Trail Sierras del Bandolero 166km 2023 (40 hours) |
| 116611 | García Sitjar | Manuel Guillermo | M | Mallorca | ES | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 107346 | Garcia-Carroll | Ryan | M | GA | US | 4 | Yeti (Virginia) 100M 2023 (30 hours) |
| 101699 | Garcia-Fernandez | Jesus | M | CA | US | 64 | Fat Dog 120M 2023 (48 hours) |
| 109813 | Garczyk | Rafal | M | Greater Poland | PL | 1 | Istria by UTMB 110km 2023 (24 hours) |
| 114878 | Gardeia | Thomas | M | Thuringia | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 114255 | Gardiner | Cole | M | KS | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 115328 | Gardner | Canaan | M | Ohio | US | 1 | Mohican 100M 2023 (32 hours) |
| 115851 | Gardner | Robert | M | Indiana | US | 1 | Indiana 100M 2023 (30 hours) |
| 115580 | Garelli | Giorgio | M | Italy | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 113087 | Garmire | Jeffrey | M | WA | US | 2 | Cocodona 250M 2023 (125 hours) |
| 111805 | Garneau | Michael | M | Québec | CA | 2 | Zion 100M 2023 (36 hours) |
| 105450 | Garneau | Simon | M | QC | CA | 16 | Cruel Jewel 106M 2023 (48 hours) |
| 116007 | Garneau | Tracy | F | Alberta | CA | 1 | HURT 100M 2023 (36 hours) |
| 116807 | Garner | Garrett | M | Colorado | US | 1 | Never Summer 103km 2023 (23 hours) |
| 117439 | Garner | Kenny | M | AR | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 100211 | Garner | Paul | M | GBR | GB | 32 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 117785 | Garner | Zachary | M | UT | US | 1 | Bear, The 100M 2023 (36 hours) |
| 106814 | Garnett | Ian | M | Scotland | GB | 32 | West Highland Way 95M 2023 (30 hours) |
| 115722 | Garnier | David | M | Ohio | US | 1 | Canal Corridor 100 100M 2023 (30 hours) |
| 118961 | Garnier | Hugo | M | Paris | FR | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 109572 | Garre | Miguel Ángel | M | Alicante | ES | 2 | Ultra Trail Bosques del Sur 106km 2023 (22 hours) |
| 116485 | Garrido | Abraham | M | CA | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 118965 | Garrivier | Thibaut | M | Haute-Savoie | FR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 110255 | Garstecki | Jeffrey | M | NC | US | 4 | Hellgate 100km 2022 (17 hours) |
| 111971 | Gartenberg | Joel | M | Washington | US | 2 | Cascade Crest 100M 2023 (35 hours) |
| 104967 | Garvey | Timothy | M | MO | US | 4 | Grindstone 100M 2023 (38 hours) |
| 116071 | Garwood | Leah | F | Hawaii | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 103776 | Garzolini | Tony | M | AZ | US | 16 | Black Canyon 100km 2023 (17 hours) |
| 115570 | Garzoria | Raul | M | TX | US | 1 | Zion 100M 2023 (36 hours) |
| 113337 | Gasch | Mischa | M | CA | US | 2 | Sean O'Brien 100km 2023 (16 hours) |
| 114519 | Gasnier | Thomas | M | Haute Savoie | FR | 2 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 118561 | Gassler | Thomas | M | Zürich | CH | 1 | Swiss Alps 100km 2023 (22 hours) |
| 114969 | Gaston | Grady | M | MN | US | 1 | Superior 100 100M 2023 (38 hours) |
| 118557 | GATEAU | GUILLAUME | M | Occitanie | FR | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 116099 | Gates | Benjamin | M | WI | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 101099 | Gates | Jorma | M | CA | US | 4 | Siskiyou Outback 100km 2023 (17 hours) |
| 103436 | Gates | Lee | M | CO | US | 32 | Cascade Crest 100M 2023 (35 hours) |
| 115808 | Gatta | Mauro | M | Italy | IT | 1 | Tuscany Crossing 160km 2023 (32 hours) |
| 111416 | Gatti | Leah | F | Alberta | CA | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 118129 | Gaub | Andrew | M | PA | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 108530 | gaudreault | Mike | M | QC | CA | 4 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 110486 | Gaul | Chrissy | F | OR | US | 4 | Gorge Waterfalls 100km 2023 (17 hours) |
| 102176 | Gauld | Jodie-May | F | GBR | GB | 16 | Lakeland 100M 2023 (40 hours) |
| 115805 | Gauthier | Antoine | M | Georgia | US | 1 | Mohican 100M 2023 (32 hours) |
| 103487 | Gautschi | Andrea | F | CA | US | 1 | Siskiyou Outback 100km 2023 (17 hours) |
| 102931 | Gavigan | Shawn | M | AB | CA | 64 | Lost Soul Ultra 100km 2023 (21 hours) |
| 117114 | Gavin | Cameron | M | Turangi | NZ | 1 | Taupo 100k 100km 2023 (17 hours) |
| 117964 | Gavin | Katherine | F | MD | US | 1 | Rim to River 100M 2023 (32 hours) |
| 115489 | Gavloski | Lorraine | F | ON | CA | 1 | Canal Corridor 100 100M 2023 (30 hours) |
| 112591 | Gay | Chari | F | MO | US | 2 | Tunnel Hill 100M 2022 (30 hours) |
| 115919 | Gdela | Katarzyna | F | Colorado | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 115832 | Gearhart | Maria | F | NC | US | 1 | Canal Corridor 100 100M 2023 (30 hours) |
| 118763 | Gearing | Peter | M | Victoria | AU | 1 | Surf Coast Century 100km 2023 (16 hours) |
| 115330 | Gebhardt | Paul | M | Gauteng | ZA | 1 | Karkloof 100M 2023 (36 hours) |
| 116622 | Gee | Sawyer | M | Wisconsin | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 115170 | Gegato | Jonathan Jr | M | Bukidnon | PH | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117508 | Gegu | Thierry | M | Pays de la Loire | FR | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 108349 | Gehring | Hannes | U | CO | US | 2 | Fat Dog 120M 2023 (48 hours) |
| 105473 | Geidel | Eric | M | DEU | DE | 8 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 116928 | Geiger | Christopher | M | CO | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 114897 | Geiger | Michael | M | Baden-Württemberg | DE | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104300 | Geiple | Zach | M | PA | US | 8 | Hellgate 100km 2022 (17 hours) |
| 117090 | Geldermans | Manolis | M | Noord-Brabant | NL | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 100710 | Gelinas | Chiara | F | CA | US | 8 | Cuyamaca 100km 2023 (17 hours) |
| 117616 | Genies | Antoine | M | Isère | FR | 1 | Trail Alsace Grand Est by UTMB - Ultra-Trail des Païens 109km 2023 (21 hours) |
| 115675 | Gensel | Albert | M | PA | US | 1 | Eastern States 100M 2023 (36 hours) |
| 115866 | Genth | Leah | F | MD | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 117612 | Gentile | Bob | M | CO | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 109124 | Geoffroy | DEGRANGE | M | ESSONE | FR | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 115896 | George | Ellie | F | CO | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 109457 | Georgescu | Laurentiu | M | Timiș | RO | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 107538 | Georgiev | Alex | M | New York | US | 4 | Laurel Highlands 70.5M 2023 (20 hours) |
| 103580 | Geraghty | Sophie | F | AUS | AU | 4 | Tarawera 100M 100M 2023 (36 hours) |
| 118388 | GEREMIA | CÁTIA | F | Rio Grande do Sul | US | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 117161 | Gerhardy | Benjamin | M | NSW | AU | 1 | Kosciusko by UTMB 100M 2022 (36 hours) |
| 104823 | Gerhart | Colton | M | ID | US | 32 | Beaverhead 100km 2023 (20 hours) |
| 117590 | Gerlich | Sean | M | Colorado | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 115521 | Germain | Jérôme | M | Rhône-Alpes | FR | 1 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 116845 | Gernes | Bryant | M | MT | US | 1 | Never Summer 103km 2023 (23 hours) |
| 112470 | Gerretse | Scott | M | IL | US | 2 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 116971 | Gersten | Cambria | F | CA | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 102921 | Gesualdo | Lisa | F | MD | US | 8 | Hennepin 100M 2023 (30 hours) |
| 115725 | Ghilotti | Francesco | M | Piemonte | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 103354 | Giacchetta | Rod | M | AB | CA | 8 | Canadian Death Race 125km 2023 (24 hours) |
| 115634 | Gialdini | Kimberly | F | Il | US | 1 | No Business 100M 2023 (33.5 hours) |
| 116491 | Gianniny-Engle | Cori | F | CO | US | 1 | High Lonesome 100M 2023 (37 hours) |
| 115263 | Giarnese | Scott | M | Essex | GB | 1 | Thames Path 100 100M 2023 (28 hours) |
| 116102 | Gibbard | Jon | M | Oxon | GB | 1 | Thames Path 100 100M 2023 (28 hours) |
| 114521 | GIBBONS | Kari | F | Mn | US | 2 | Hennepin 100M 2023 (30 hours) |
| 113791 | Gibbons | Ren | M | CA | US | 2 | Crazy Mountain 100M 2023 (36 hours) |
| 108841 | Gibbs | Dustin | M | MD | US | 2 | Grindstone 100km 2023 (18 hours) |
| 112853 | Gibbs | Joshua | M | NSW | AU | 2 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 112000 | Gibbs | Nick | M | Michigan | US | 2 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 118997 | Giblin | JP | M | CO | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 113185 | Gibson | Billy | M | Angus | US | 2 | West Highland Way 95M 2023 (30 hours) |
| 117442 | Gibson | Daniel | M | IN | US | 1 | Canal Corridor 100 100M 2023 (30 hours) |
| 102333 | Gibson | Giovanna | F | CA | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 112282 | Gibson | Kim | F | Massachusetts | US | 2 | Rim to River 100M 2023 (32 hours) |
| 101664 | Gibson | Michele | F | CA | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 100095 | Giebel | Yaniha | F | MN | US | 4 | San Diego 100M 2023 (32 hours) |
| 112534 | Giebler | Emma | F | NV | US | 2 | Wasatch Front 100M 2023 (36 hours) |
| 111488 | Giessler | Eric | M | Ohio | US | 2 | Canal Corridor 100 100M 2023 (30 hours) |
| 113073 | Gifford | Eva | F | British Columbia | CA | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 103015 | Gifford | Katherine | F | CA | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 111520 | Gigon | Arthur | M | London | GB | 2 | Transgrancanaria 125km 2023 (28 hours) |
| 114373 | Gilbert | Ashley | M | Norfolk | GB | 2 | South Downs Way 100M 2023 (30 hours) |
| 102647 | Gilbert | Josh | M | VA | US | 2 | Grindstone 100km 2023 (18 hours) |
| 117376 | Gilbert | Matthew | M | IL | US | 1 | Hennepin 100M 2023 (30 hours) |
| 110628 | Gilbert | Nathaniel | M | UT | US | 4 | Run Rabbit Run 100M 2023 (36 hours) |
| 100139 | Gilbert | Shane | M | UT | US | 2 | Zion 100km 2023 (19 hours) |
| 109478 | Gilbert | VILLIEN | M | FRANCE | FR | 2 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 108043 | Gile | Mike | M | TX | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 114966 | Giles | Matt | M | Washington | US | 1 | Cascade Crest 100M 2023 (35 hours) |
| 115304 | Gill | Jonathon | M | North Yorkshire | GB | 1 | Hardwolds 80M 2022 (24 hours) |
| 102706 | Gill-Fortin | Jasmin | M | QC | CA | 2 | Quebec Mega Trail 100M 2023 (40 hours) |
| 115821 | Gilles | Benjamin | M | Vlaams-Brabant | BE | 1 | Thames Path 100 100M 2023 (28 hours) |
| 114596 | Gilliam | Colin | M | BC | CA | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 114342 | Gilliam | Daniel | M | Ca | US | 1 | Cocodona 250M 2023 (125 hours) |
| 113329 | Gillis | Craig | M | OR | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 117257 | Gilmer | Brock | M | South Dakota | US | 1 | Superior 100 100M 2023 (38 hours) |
| 115391 | Gilmour | Ross | M | Staffordshire | GB | 1 | Lakeland 100M 2023 (40 hours) |
| 115572 | Gilot | Aurélie | F | Bourgogne | FR | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 113405 | Gingery | Lucas | M | MN | US | 2 | Kettle Moraine 100M 2023 (30 hours) |
| 117310 | Gioia | Ken | M | CA | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 118737 | giordano | elisa | F | italia | IT | 1 | Tuscany Crossing 103km 2023 (21 hours) |
| 103584 | Giordano | Gina | F | NY | US | 16 | Laurel Highlands 70.5M 2023 (20 hours) |
| 115848 | Gipe | Jessie | F | OH | US | 1 | Umstead 100M 2023 (30 hours) |
| 115418 | GIRARD | Sophie | F | Picardie | FR | 1 | Ultra Trail Bosques del Sur 106km 2023 (22 hours) |
| 118785 | Girona | Pablo | M | FRIBOURG | CH | 1 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 111909 | Girouard | Jason | M | NY | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 109775 | Giroud | Mathilde | F | Haut de seine | FR | 2 | Canyons by UTMB 100M 2023 (32 hours) |
| 116796 | Gittelman | Brandon | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 115516 | Gjurković | Matej | M | Grad Zagreb | HR | 1 | Istria by UTMB 110km 2023 (24 hours) |
| 115961 | Glasier | Gabriel | M | Oregon | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 117766 | Glass | Dan | M | Nevada | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 107236 | Glatthor | Thorsten | M | - Auswählen - | DE | 4 | Zugspitz 111km 2023 (25 hours) |
| 112346 | Glaze | Andrew | M | CA | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 116531 | Glazer | Caroline | F | CO | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 109025 | Glazier | Dustin | M | Alaska | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 118162 | GLEIZES | Etienne | M | Eure-et-Loire | FR | 1 | Tor des Géants 330km 2023 (132 hours) |
| 104442 | Glennie | Graham | M | AB | CA | 64 | Quicksilver 100km 2023 (17 hours) |
| 112041 | Glibbery | Matthew | M | CA | US | 2 | Fat Dog 120M 2023 (48 hours) |
| 111021 | Glick | Arlen | M | OH | US | 1 | Western States 100M 2023 (30 hours) |
| 100397 | Glick | James | M | NC | US | 8 | Siskiyou Outback 100km 2023 (17 hours) |
| 117367 | Glick | Merle | M | South Carolina | US | 1 | Grindstone 100km 2023 (18 hours) |
| 115645 | Glitz | Jason | M | MD | US | 1 | Laurel Highlands 70.5M 2023 (20 hours) |
| 116379 | Globensky | Jennifer | F | TEXAS | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 115245 | Glos | Vaclav | M | Czech Republic | CZ | 1 | Grossglockner UltraTrail 110km 2023 (28 hours) |
| 116098 | Glover | Dawn | F | Alberta | CA | 1 | Fat Dog 120M 2023 (48 hours) |
| 111219 | Gloyeske | Adam | M | Ohio | US | 2 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 113759 | Glück | Matthias | M | Baden-Württemberg | DE | 2 | Zugspitz 111km 2023 (25 hours) |
| 100392 | Gnann | Abraham | M | NY | US | 8 | Run Rabbit Run 100M 2023 (36 hours) |
| 106114 | Gniadek | Tomasz | M | POL | PL | 8 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 103139 | Gnoza | Stephen | M | CO | US | 16 | Black Canyon 100km 2023 (17 hours) |
| 114921 | Goad | Ralf | M | Somerset | GB | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 105269 | Gobert | Yann | M | FRA | FR | 8 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115339 | Godet | Sébastien | M | Aquitaine | FR | 1 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 117039 | Godin | Allison | F | Oregon | US | 1 | Grindstone 100km 2023 (18 hours) |
| 116688 | Godwin | Sean | M | UT | US | 1 | IMTUF 100M 2023 (36 hours) |
| 116417 | Goeller | Jacob | M | MO | US | 1 | Never Summer 103km 2023 (23 hours) |
| 117086 | Goelz | Hans-Peter | M | Baden-Wuerttemberg | DE | 1 | Trail Alsace Grand Est by UTMB - Ultra-Trail des Païens 109km 2023 (21 hours) |
| 104550 | Goergen | Jonathan | M | CA | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 116141 | Goh | EuJin | M | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 112478 | Goh | Mark | M | CA | US | 2 | Zion 100km 2023 (19 hours) |
| 116425 | Goj | Paul | M | Bavaria | DE | 1 | Eiger Ultra Trail 250km 2023 (90 hours) |
| 108599 | Golaszewski | Gwen | F | Colorado | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 101585 | Goldberg | Kevin | M | CO | US | 2 | Cocodona 250M 2023 (125 hours) |
| 112330 | Goldberg | Michelle | F | PA | US | 2 | Burning River 100M 2023 (30 hours) |
| 115310 | Golden | Joshua | M | MD | US | 1 | Grindstone 100km 2023 (18 hours) |
| 100947 | Goldfarb | Luann | F | DE | US | 2 | No Business 100M 2023 (33.5 hours) |
| 100781 | Goldfield | John | M | NC | US | 8 | Canal Corridor 100 100M 2023 (30 hours) |
| 118050 | Goldsbrough | Greg | M | Dorset | GB | 1 | North Downs Way 100M 2023 (30 hours) |
| 118928 | Goldstein | Devon | F | BC | CA | 1 | IMTUF 100M 2023 (36 hours) |
| 107896 | Goldstein | Jeff | M | MN | US | 4 | Superior 100 100M 2023 (38 hours) |
| 102049 | Goldstein | Matthew | M | NY | US | 2 | Grindstone 100km 2023 (18 hours) |
| 100669 | Golea | Cedric | M | FRA | FR | 8 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 119150 | GOLEBIOWSKI | ADAM | M | QLD | AU | 1 | Guzzler Ultra 100km 2023 (24 hours) |
| 100794 | Golembeski | Tom | M | CT | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 104027 | Gomez | Luis | M | FL | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 116174 | GÓMEZ LLAMAS | JOSÉ LUIS | M | JALISCO | MX | 1 | Oso Negro 100km 2023 (24 hours) |
| 110183 | Gong | Russell | M | CA | US | 2 | Miwok 100km 2023 (15.5 hours) |
| 105874 | Gonyaw | Kristen | F | PA | US | 8 | Eastern States 100M 2023 (36 hours) |
| 111998 | Gonzales | Aaron | M | Texas | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 118169 | Gonzales | Brian | M | CA | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 116024 | Gonzales | Yamil | M | Francisco Morazan | HN | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 116011 | Gonzalez | Elizabeth | F | texas | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 115379 | Gonzalez | Florian | M | Auvergne Rhône Alpes | FR | 1 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 108954 | Gonzalez | Jose | M | CA | US | 4 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 112589 | Gonzalez | Juan | M | NSW | AU | 2 | Kosciusko by UTMB 100km 2022 (18 hours) |
| 115934 | Gonzalez | Michael | M | Utah | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 101128 | Gonzalez | Milton | M | MEX | MX | 4 | Cruel Jewel 106M 2023 (48 hours) |
| 118976 | González Llera | David | M | Asturias | ES | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 113571 | Gonzalez-outon | carlos | M | MADRID | US | 2 | Gran Trail Peñalara 110km 2023 (25 hours) |
| 111443 | Good | Ryan | M | Oregon | US | 2 | Bighorn 100M 2023 (35 hours) |
| 106458 | Gooding | Jon | M | AUS | AU | 2 | Guzzler Ultra 100km 2023 (24 hours) |
| 117411 | Goodleaf | Tehorakwaneken | M | Quebec | CA | 1 | Grindstone 100km 2023 (18 hours) |
| 116784 | Goodlett | Marty | M | TENNESSEE | US | 1 | Hennepin 100M 2023 (30 hours) |
| 105880 | Goodman | Harris | M | CA | US | 4 | Waldo 100km 2023 (18 hours) |
| 105101 | Goodmanson | Jeff | M | IL | US | 4 | Superior 100 100M 2023 (38 hours) |
| 105281 | Goodwin | Evan | M | CA | US | 32 | Cuyamaca 100km 2023 (17 hours) |
| 104755 | Goodwin | Jeni | F | IL | US | 1 | Western States 100M 2023 (30 hours) |
| 103418 | Goodyear | Scott | M | ON | CA | 16 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 118687 | Goose | Jake | M | British Columbia | CA | 1 | Beaverhead 100km 2023 (20 hours) |
| 116731 | Gopal | Rachael | F | VIC | AU | 1 | Surf Coast Century 100km 2023 (16 hours) |
| 116341 | Göpel | Tobias | M | Thüringen | DE | 1 | Grossglockner UltraTrail 110km 2023 (28 hours) |
| 108287 | GORBY | KATHLEEN | F | FL | US | 4 | HOKA Bandera 100km 2023 (17 hours) |
| 104011 | Gordon | Amy | F | AZ | US | 16 | Tahoe 200 202M 2023 (100 hours) |
| 111730 | Gordon | Scott | M | NC | US | 2 | Umstead 100M 2023 (30 hours) |
| 117093 | Gorelik | Dmitry | M | NSW | AU | 1 | Kosciusko by UTMB 100km 2022 (18 hours) |
| 115651 | Gori | Giulia | F | PO | IT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 104305 | Gorichanaz | Tim | M | PA | US | 128 | Eastern States 100M 2023 (36 hours) |
| 113725 | Goris | Rik | M | Vlaams-brabant | BE | 2 | Grossglockner UltraTrail 110km 2023 (28 hours) |
| 101600 | Gorney | Chris | M | NV | US | 8 | Leona Divide 100km 2023 (16 hours) |
| 110758 | Goscinski | Dwayne | M | Co | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 115785 | Goshorn | Heath | M | Ohio | US | 1 | Burning River 100M 2023 (30 hours) |
| 106826 | Gosselin | Serge | M | 4 | Eastern States 100M 2023 (36 hours) | ||
| 116761 | goto | norihito | M | 神奈川県 | JP | 1 | Shinetsu Five Mountains Trail 100M 2023 (33 hours) |
| 101232 | Goudie | Mandi | F | BC | CA | 32 | Bigfoot 206M 2023 (100 hours) |
| 105105 | Gould | Jeffrey | M | CA | US | 16 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 106663 | Goundry | Jim | M | NJ | US | 32 | IMTUF 100M 2023 (36 hours) |
| 103606 | Gourgas | Thomas | M | FRA | FR | 8 | Ultra Trail Lago d'Orta 102km 2023 (24 hours) |
| 111827 | GOURGOT | Sebastien | M | VAUCLUSE | FR | 2 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 111336 | Gouya | Jérôme | M | Bretagne | FR | 2 | Swiss Alps 100M 2023 (49 hours) |
| 119100 | Gower | Gavin | M | Auckland NZ | NZ | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 105932 | Gowland | Jim | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 102684 | Grabow | Rachel | F | TX | US | 32 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 118894 | Grace | Douglas | M | IL | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 117764 | Grace | Harry | M | Jersey | JE | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 115458 | Gracia | Toni | F | Victoria | AU | 1 | Kosciusko by UTMB 100km 2022 (18 hours) |
| 101813 | Grade | Michael | M | CA | US | 16 | Black Canyon 100km 2023 (17 hours) |
| 115020 | Grady | Jay | M | Cornwall | GB | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 100941 | Grady | Kyle | M | TN | US | 1 | Western States 100M 2023 (30 hours) |
| 116214 | Graf | Nicolas | M | Zurich | CH | 1 | Eiger Ultra Trail 101km 2023 (23 hours) |
| 117765 | Graf | Thomas | M | Vaud | CH | 1 | Eiger Ultra Trail 101km 2023 (23 hours) |
| 109281 | Grafnetterova | Nikola | F | TX | US | 4 | Siskiyou Outback 100km 2023 (17 hours) |
| 117271 | Graham | Annie | F | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 115409 | Graham | Anthony | M | NSW | AU | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 109742 | Graham | Brad | M | British Columbia | CA | 4 | Lost Soul Ultra 100km 2023 (21 hours) |
| 115551 | Graham | Cayla | F | VA | US | 1 | Grindstone 100km 2023 (18 hours) |
| 116480 | Grahn | Holly | F | BC | CA | 1 | Lost Soul Ultra 100km 2023 (21 hours) |
| 114601 | Gram | Peter | M | WY | US | 1 | Wasatch Front 100M 2023 (36 hours) |
| 108097 | Gramza | Ashley | F | AR | US | 4 | HOKA Bandera 100km 2023 (17 hours) |
| 111992 | Grandy | Trevor | M | Oregon | US | 2 | Beaverhead 100km 2023 (20 hours) |
| 101576 | Granger | Charlie | M | NY | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 102676 | Granskog | Stefan | M | FIN | FI | 8 | Täby Extreme Challenge 100 100M 2023 (30 hours) |
| 115113 | Grant | Gavin | M | Qld | AU | 1 | Blackall 100K 100km 2023 (18 hours) |
| 110061 | Grant | Graham | M | GA | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 100788 | Grant | Josh | M | CA | US | 4 | High Lonesome 100M 2023 (37 hours) |
| 112113 | Grant | Sean | M | CA | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 110724 | Grant | Sophie | F | London | GB | 2 | Tor des Géants 330km 2023 (132 hours) |
| 117871 | Grappo | Travis | M | Alabama | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 117693 | Grasset-Bourdel | Renaud | M | Austria | AT | 1 | Grossglockner UltraTrail 110km 2023 (28 hours) |
| 115527 | Gratteri | Roman | M | Oregon | US | 1 | HURT 100M 2023 (36 hours) |
| 117791 | Gray | Bobby | M | CA | US | 1 | Tahoe 200 202M 2023 (100 hours) |
| 116600 | Gray | Christopher | M | Ohio | US | 1 | Canal Corridor 100 100M 2023 (30 hours) |
| 109267 | Gray | Corey | M | VA | US | 4 | Hellgate 100km 2022 (17 hours) |
| 107382 | Gray | Jason | M | MA | US | 2 | Massanutten 100M 2023 (36 hours) |
| 106281 | Gray | Johnathan | M | GBR | GB | 16 | Autumn 100M 2023 (28 hours) |
| 115606 | Gray | Kathleen | F | Texas | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 118829 | Gray | Mikaela | F | Victoria | AU | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 102966 | Gray | Sho | M | TN | US | 4 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 111577 | Grealy | Sarah | F | New South Wales | AU | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 104071 | Greaney | Sean | M | WA | US | 2 | IMTUF 100M 2023 (36 hours) |
| 116551 | Green | Alec | M | QLD | AU | 1 | Blackall 100K 100km 2023 (18 hours) |
| 110229 | Green | Dan | M | West Virginia | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 107298 | Green | David | M | Florida | US | 2 | Brazil 135 135M 2023 (120 hours) |
| 116371 | Green | Edward | M | MO | US | 1 | Long Haul 100M 2023 (30 hours) |
| 117369 | Green | Jimmey | M | OK | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 104700 | Green | Jock | M | ZAF | ZA | 8 | Ultra-Trail Cape Town 100M 2022 (45 hours) |
| 118018 | Green | Joseph | M | Louisiana | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 116452 | Green | Rachael | F | WGN | NZ | 1 | Beaverhead 100km 2023 (20 hours) |
| 116952 | Green | Tammy | F | QLD | AU | 1 | Guzzler Ultra 100km 2023 (24 hours) |
| 100200 | Green | Travis | M | ZAF | ZA | 4 | Ultra-Trail Cape Town 100km 2022 (21 hours) |
| 100328 | Green | Will | M | TX | US | 32 | Never Summer 103km 2023 (23 hours) |
| 116893 | Greenberg | Bob | M | CO | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 113245 | Greenberg | Dan | M | TX | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 111837 | Greenberg | Harrison | M | New York | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 108433 | Greene | Jess | F | WA | US | 4 | Moab 238M 2023 (106 hours) |
| 100863 | Greene | Justin | M | CA | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 118734 | Greenfield | Helen | F | Queensland | AU | 1 | Blackall 100K 100km 2023 (18 hours) |
| 110379 | Greenhaw | Lanier | M | AL | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 107978 | Greenlee | Erik | M | California | US | 4 | Cuyamaca 100km 2023 (17 hours) |
| 115669 | Greensted | Richard | M | OR | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 115741 | Greenwalt | Dawn | F | AZ | US | 1 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 101028 | Greenwood | John | M | GBR | GB | 16 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 112481 | Greenwood | Maiya | F | CA | US | 2 | Beaverhead 100km 2023 (20 hours) |
| 112172 | Greer | Michael | M | AZ | US | 2 | Cocodona 250M 2023 (125 hours) |
| 111951 | Gregg | Harry | M | FL | US | 2 | Long Haul 100M 2023 (30 hours) |
| 117605 | Gregory | Jeanetta | F | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 116565 | Gregory | Julia | F | Victoria | AU | 1 | Guzzler Ultra 100km 2023 (24 hours) |
| 105916 | Gregware | Mark | M | MN | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 103369 | Grengs | Patrick | M | WA | US | 16 | Umstead 100M 2023 (30 hours) |
| 101823 | Grenier | Francois | M | CA | US | 8 | Miwok 100km 2023 (15.5 hours) |
| 116447 | Grey | Emma | F | NSW | AU | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 104150 | Greynolds | Angela | F | AZ | US | 1 | Western States 100M 2023 (30 hours) |
| 113984 | GRGICH | MARTIN | M | Córdoba | AR | 2 | Patagonia 100M 2023 (37 hours) |
| 111798 | Grice | Nicola | F | BC | CA | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 116323 | Griebenow | Jakob | M | Saxony | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 116367 | Grieve | Heather | F | Ontario | CA | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 117582 | Griffin | John | M | MS | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 118796 | Griffin | Kevin | M | AR | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 116035 | Griffin | Louise | F | Hampshire | GB | 1 | Thames Path 100 100M 2023 (28 hours) |
| 111666 | Griffin | Marc | M | Virginia | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 105511 | Griffin | Michael | M | CA | US | 2 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 109000 | Griffin | Tyler | M | Texas | US | 4 | Grindstone 100km 2023 (18 hours) |
| 111406 | Griffith | Matthew | M | TX | US | 2 | Leona Divide 100km 2023 (16 hours) |
| 117305 | Griffith | Travis | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 107798 | Grigg | Justin | M | MT | US | 4 | Fat Dog 120M 2023 (48 hours) |
| 100925 | Grigsby | Brianna | F | AZ | US | 16 | Black Canyon 100km 2023 (17 hours) |
| 114901 | Grillo | Ennio | M | Italia | IT | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104499 | Grills | Mat | M | AUS | AU | 4 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 115380 | Grimsley | Joshua | M | GA | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 115485 | Griniece | Ieva | F | Latvia | LV | 1 | Nice Côte d'Azur by UTMB 159km 2023 (48 hours) |
| 110245 | Grinovich | Thomas | M | FL | US | 2 | Long Haul 100M 2023 (30 hours) |
| 115751 | Grinstain | Joseph | M | California | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 116930 | Grissom | Justin | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 112345 | Grobe | Jeffrey | M | AZ | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 116948 | Grobe | Lena | F | CA | US | 1 | Waldo 100km 2023 (18 hours) |
| 112056 | Grochot | Steve | M | Ontario | CA | 2 | Twisted Branch 100km 2023 (20 hours) |
| 118366 | Grodnitzky | Justin | M | IA | US | 1 | Hennepin 100M 2023 (30 hours) |
| 108502 | Groezinger | Rene | M | Bavaria | DE | 2 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 117329 | Groff | Seth | N | NE | US | 1 | Bighorn 100M 2023 (35 hours) |
| 117786 | Groleau | Philippe | M | QC | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 105796 | Groleau | Romain | M | Auckland | NZ | 16 | Tarawera 100M 100M 2023 (36 hours) |
| 114246 | Groll | Nick | M | WCAPE | ZA | 2 | Ultra-Trail Cape Town 100M 2022 (45 hours) |
| 113136 | Groome | Miller | M | NC | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 110738 | GROS | Sylvain | M | RHONE | FR | 2 | Les Coursières des Hauts du Lyonnais 111km 2023 (22 hours) |
| 117059 | Grose | Tucker | M | CO | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 117820 | Gross | Christian | M | Bayern | DE | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 116635 | Gross | Shawn | M | NC | US | 1 | Umstead 100M 2023 (30 hours) |
| 115856 | Gross | Tony | M | TN | US | 1 | No Business 100M 2023 (33.5 hours) |
| 114363 | Grosskreutz | Adam | M | Kentucky | US | 2 | Tahoe 200 202M 2023 (100 hours) |
| 102677 | Grossman | Dominic | M | CA | US | 64 | Waldo 100km 2023 (18 hours) |
| 118890 | Grossman | Harlan | M | Colorado | US | 1 | Never Summer 103km 2023 (23 hours) |
| 115529 | Grot | Sebastien | M | Bretagne | FR | 1 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 117754 | Groth | David | M | OH | US | 1 | Mohican 100M 2023 (32 hours) |
| 119062 | GROUILLARD STEFENEL | Antoine | M | France | FR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117019 | Grubbs | Eric | M | IN | US | 1 | Pine to Palm 100M 2023 (34 hours) |
| 100493 | Grudziak | Marianna | F | Pa | US | 8 | Laurel Highlands 70.5M 2023 (20 hours) |
| 113036 | Gruenbacher | Doug | M | Kansas | US | 2 | Never Summer 103km 2023 (23 hours) |
| 118349 | Gruhl | Thomas | M | Select State | GB | 1 | Istria by UTMB 110km 2023 (24 hours) |
| 106831 | Grund | Matthew | M | 32 | Yeti (Virginia) 100M 2023 (30 hours) | ||
| 115685 | Grundmann | Nathan | M | North Carolina | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 116746 | Grunewald | Justin | M | CO | US | 1 | Grindstone 100km 2023 (18 hours) |
| 117654 | Grüntjens | Sabine | F | Baden-Württemberg | DE | 1 | Eiger Ultra Trail 101km 2023 (23 hours) |
| 115480 | Gruschwitz | Sascha | M | Niedersachsen | DE | 1 | Grossglockner UltraTrail 110km 2023 (28 hours) |
| 105702 | Gryfe | Rob | M | ON | CA | 32 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 107207 | Gschwandtner | Wolfgang | M | Austria | AT | 4 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 114111 | Gschwind | Dylan | M | WA | US | 2 | Worlds End 100km 2023 (19 hours) |
| 107590 | Guadarrama | Suzanna | F | Colorado | US | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 103676 | Guarischi | Rosalia | F | BRA | BR | 16 | Javelina Jundred 100M 2023 (30 hours) |
| 101434 | Guchuvo | Eduar | M | COL | CO | 4 | Twisted Branch 100km 2023 (20 hours) |
| 110109 | Guenebaut | Boris | M | CA | US | 4 | Wasatch Front 100M 2023 (36 hours) |
| 117138 | Guenther | Jan | M | Schleswig-Holstein | DE | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 100298 | Guenther | Rebecca | F | CA | US | 16 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 107361 | Guerard | Simon | M | Quebec | CA | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 108547 | Guerini | Luca | M | Italy | IT | 4 | Scenic Trail 119km 2023 (30 hours) |
| 108641 | Guerra | Omar | M | Florida | US | 4 | Long Haul 100M 2023 (30 hours) |
| 115894 | Guerrero Barrera | Claudia | F | Virginia | US | 1 | Grindstone 100km 2023 (18 hours) |
| 116082 | Guffey | Jacob | M | North Carolina | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 102067 | Guibert | Cyril | M | FRA | FR | 4 | Val d'Aran by UTMB, Camins de Hèr 105km 2023 (26 hours) |
| 115715 | Guiheneuf | Nicolas | M | Bouches du Rhône | FR | 1 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 115574 | Guilbault | Elisabeth | F | Quebec | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 109550 | Guillaume | Clement | M | Ca | US | 4 | Quicksilver 100km 2023 (17 hours) |
| 115305 | Guillaume | DEVILLIERS | M | Egly | FR | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 116270 | Guillemant | Marion | F | TX | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 101071 | Guillot | Thierry Maxime | M | FL | FR | 32 | Black Canyon 100km 2023 (17 hours) |
| 111293 | Gumpert | Julia | F | NC | US | 1 | Beaverhead 100km 2023 (20 hours) |
| 116289 | Gundermann | Ralf | M | Thüringen | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 115996 | Gungle | Bruce | M | Arizona | US | 1 | Cocodona 250M 2023 (125 hours) |
| 117447 | Gunhus | Tiffany | F | IA | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 102364 | Gunkel | Lance | M | IA | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 116056 | Gunn | Misty | F | MI | US | 1 | Hennepin 100M 2023 (30 hours) |
| 113691 | Gunoe | Samuel | M | Utah | US | 2 | Moab 238M 2023 (106 hours) |
| 115460 | Günther | Timon | M | Bavaria | DE | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 116037 | Guo | Yumei | F | Arizona | US | 1 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 117133 | Guptill | Byron | M | ON | CA | 1 | Mohican 100M 2023 (32 hours) |
| 118596 | Gura | Charlie | M | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 118051 | Gusain | Avinash | M | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 118700 | Gushiken | Derek | M | UT | US | 1 | IMTUF 100M 2023 (36 hours) |
| 110350 | Guthrie | Kaitlyn Mac | F | MA | US | 4 | Run Rabbit Run 100M 2023 (36 hours) |
| 114726 | Gutierrez | Luis | M | TX | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 118656 | Gutierrez | Mario | M | WY | US | 1 | Bighorn 100M 2023 (35 hours) |
| 116781 | Guy | Harley | M | Arizona | US | 1 | Cocodona 250M 2023 (125 hours) |
| 114851 | Guyonneau | Francois | M | QC | CA | 1 | Quebec Mega Trail 100M 2023 (40 hours) |
| 105348 | Guza | Peter | M | MA | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 116669 | Guzick | Will | M | California | US | 1 | Bear, The 100M 2023 (36 hours) |
| 114987 | Guzzon | Raffaele | M | Italy | IT | 1 | Morenic Trail 100km 2023 (22 hours) |
| 118740 | Gwozdecki | Tomasz | M | Dolnoslaskie | PL | 1 | Salomon Cappadocia Ultra-Trail 119km 2023 (23 hours) |
| 108461 | Gylland | Lars Erik | M | Trøndelag | NO | 2 | Salomon Xreid Trollheimen 120km 2023 (35 hours) |
| 103182 | Ha | Tommy | M | CA | US | 16 | Gorge Waterfalls 100km 2023 (17 hours) |
| 103637 | Haake | Klaus | M | DEU | DE | 16 | Trail Verbier St Bernard by UTMB 140km 2023 (40 hours) |
| 115377 | Haarhoff | Alastair | M | Western Cape | ZA | 1 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 117869 | Haas | Chris | M | CA | US | 1 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 117618 | Haas | James | M | DC | US | 1 | Grindstone 100M 2023 (38 hours) |
| 118280 | Haas | John | M | California | US | 1 | San Diego 100M 2023 (32 hours) |
| 117403 | Haas | Robby | M | CO | US | 1 | IMTUF 100M 2023 (36 hours) |
| 117688 | HABE | Kazutoshi | M | Hyogo | JP | 1 | OSJ Ontake 100M 2023 (24 hours) |
| 113956 | Haby | Shaun | M | Washington | US | 2 | Cascade Crest 100M 2023 (35 hours) |
| 102417 | Hack | Michael | M | CA | US | 8 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 118621 | Hack | Peter | M | Viken | NO | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116022 | hacket | frank | M | Massachusetts | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 117352 | Haddley | Jay | M | Cheshire | GB | 1 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 118769 | Haddock | John | M | AR | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 102070 | Hadfield | Kevin | M | CO | US | 64 | Run Rabbit Run 100M 2023 (36 hours) |
| 108784 | Hadfield | Liesel | F | Colorado | US | 2 | High Lonesome 100M 2023 (37 hours) |
| 100222 | Hadfield | Paul | M | AUS | AU | 32 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 104495 | Haefner | Jodi | F | IL | US | 8 | Tunnel Hill 100M 2022 (30 hours) |
| 100117 | Haenggi | Michel | M | AUS | AU | 8 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 107487 | Haeseler | Troy | M | WA | US | 4 | Canyons by UTMB 100km 2023 (18 hours) |
| 100960 | Hagen | Andy | M | MN | US | 2 | Superior 100 100M 2023 (38 hours) |
| 103253 | Hagen | Bjoern | M | AZ | US | 8 | Trail Verbier St Bernard by UTMB 140km 2023 (40 hours) |
| 104546 | Hagen | Lindsey | F | OR | US | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 101951 | Hagen | Matt | M | WA | US | 1 | Western States 100M 2023 (30 hours) |
| 101864 | Hagenah | Matthew | M | ID | US | 64 | Beaverhead 100km 2023 (20 hours) |
| 118759 | Haggerty | Nicholas | M | Texas | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 113390 | Hagiwara | Hisaya | M | kanagawa | JP | 2 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 102236 | Hahn | Andrew | M | WI | US | 8 | Superior 100 100M 2023 (38 hours) |
| 106836 | Hahn | Nathan | M | California | US | 1 | Western States 100M 2023 (30 hours) |
| 106837 | Hahn | Staci | F | WI | US | 64 | Waldo 100km 2023 (18 hours) |
| 117148 | Haidar | Tarek | M | NC | US | 1 | Umstead 100M 2023 (30 hours) |
| 117316 | Haidinger | Rainer | M | Upper Austria | AT | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 100816 | Haight | Daniel | M | OH | US | 1 | Western States 100M 2023 (30 hours) |
| 102546 | Haislip | Kris | M | GA | US | 16 | Cruel Jewel 106M 2023 (48 hours) |
| 110734 | Håkansson | Daniel | M | Helsingborg | SE | 2 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 112726 | Halapin | Natalie | F | North Carolina | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 107254 | Hale | James | M | Maryland | US | 2 | Grindstone 100km 2023 (18 hours) |
| 112143 | Hale | Kate | F | Vermont | US | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 103455 | Hale | Kit | M | MN | US | 8 | Quicksilver 100km 2023 (17 hours) |
| 116290 | Hale | Leanne | F | Saskatchewan | CA | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 117253 | Halkosaari | Lauri | M | Uusimaa | FI | 1 | Nuts Ylläs Pallas 160km 2023 (36 hours) |
| 102451 | Hall | Ashley | F | NV | US | 8 | Canyons by UTMB 100M 2023 (32 hours) |
| 102365 | Hall | Douglas | M | MA | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 115277 | Hall | Graeme | M | Scottish Borders | GB | 1 | West Highland Way 95M 2023 (30 hours) |
| 111563 | Hall | Gram | M | TX | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 108283 | Hall | Jason | M | MO | US | 4 | Beaverhead 100km 2023 (20 hours) |
| 113027 | Hall | Jeffrey | M | UTAH | US | 2 | Zion 100M 2023 (36 hours) |
| 118408 | Hall | Nick | M | Nsw | AU | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 118818 | Hall | Patricia | F | North Carolina | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 112065 | hall | peter | M | colorado | US | 2 | HOKA Bandera 100km 2023 (17 hours) |
| 118071 | Hall | Raymond | M | Illinois | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 118832 | Hall | Samuel | M | Texas | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 117354 | Hallahan | Patrick | M | NY | US | 1 | Tahoe 200 202M 2023 (100 hours) |
| 103033 | Halleran | Elizabeth | F | AB | CA | 4 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 111571 | Hallermann | Ryan | M | MN | US | 2 | Hennepin 100M 2023 (30 hours) |
| 116196 | Halliburton | Kevin | M | TX | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 110757 | Halliday | John | M | Victoria | AU | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 113122 | Hallmark | Luke | M | WI | US | 2 | Kettle Moraine 100M 2023 (30 hours) |
| 102373 | Hallum-Montes | Rachel | F | CO | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 108738 | Halverson | Matt | M | Arizona | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 117372 | Halvorsen | Tom Erik | M | Rogaland | NO | 1 | Nice Côte d'Azur by UTMB 159km 2023 (48 hours) |
| 105857 | Ham | Mallory | M | CA | US | 64 | Javelina Jundred 100M 2023 (30 hours) |
| 100827 | Hamberlin | Deborah | F | AZ | US | 8 | Javelina Jundred 100M 2023 (30 hours) |
| 117707 | Hambrick | Greg | M | KY | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 101982 | Hamburg | Jennifer | F | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 105034 | Hamdorff | Ryan | M | SC | US | 1 | Western States 100M 2023 (30 hours) |
| 116277 | Hamel | Erika | F | NH | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 106840 | Hamilton | Andy | M | 4 | Hardrock 100M 2023 (48 hours) | ||
| 115792 | Hamilton | Blake | M | AK | US | 1 | Brazos Bend 100M 2022 (30 hours) |
| 102941 | Hamilton | Brian | M | OR | US | 1 | Bigfoot 206M 2023 (100 hours) |
| 113726 | Hamilton | Nicholas | M | Ca | US | 2 | Canyons by UTMB 100M 2023 (32 hours) |
| 104903 | Hamilton | Paula | F | CA | US | 32 | Miwok 100km 2023 (15.5 hours) |
| 112480 | Hamilton | Zeke | M | Ohio | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 118403 | Hamman | Aaron | M | MI | US | 1 | Moab 238M 2023 (106 hours) |
| 102493 | Hammel | Jason | M | Texas | US | 8 | Arkansas Traveler 100M 2023 (30 hours) |
| 106210 | Hammer | Koltin | M | PA | US | 4 | Never Summer 103km 2023 (23 hours) |
| 100541 | Hammes | Christopher | M | CO | US | 32 | Run Rabbit Run 100M 2023 (36 hours) |
| 119005 | Hammond | John | M | Chesire | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 112578 | Hammond | Mark | M | Utah | US | 2 | Hardrock 100M 2023 (48 hours) |
| 105866 | Hammond | Paul | M | Aberdeenshire | GB | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 102741 | Hamoudi | Lindsay | M | CA | US | 128 | San Diego 100M 2023 (32 hours) |
| 103050 | Hampton | John | M | NV | US | 16 | Siskiyou Outback 100km 2023 (17 hours) |
| 115752 | Hampton | Royce | M | Utah | US | 1 | Wasatch Front 100M 2023 (36 hours) |
| 116873 | Hamulecki | Julie | F | Ontario | CA | 1 | Black Canyon 100km 2023 (17 hours) |
| 117949 | Hanczakowski | Allira | F | Wellington | NZ | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 113055 | Hand | Sam | M | Limerick | IE | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 104066 | Handloser | Walter | M | CA | US | 64 | Bear, The 100M 2023 (36 hours) |
| 117294 | Handrich | Ben | M | OR | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 115663 | Hanes | Lucie | F | Colorado | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 108780 | Haney | Brandon | M | Texas | US | 4 | HOKA Bandera 100km 2023 (17 hours) |
| 104347 | Haney | Charlie | M | TN | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 103561 | Hangbing | Wang | M | CHN | CN | 2 | Columbia Ultra Trail Chongli 130km 2023 (36 hours) |
| 116282 | Hangler | Markus | M | Upper Austria | AT | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 109311 | Hankins | Kara | F | MS | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 118353 | Hanks | Todd | M | Ohio | US | 1 | Grindstone 100M 2023 (38 hours) |
| 112980 | Hanley | Kathleen | F | Texas | US | 2 | HOKA Bandera 100km 2023 (17 hours) |
| 116967 | Hanley | Kerrie | F | Canterbury | NZ | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 102405 | Hanna | Zach | M | FL | US | 1 | Western States 100M 2023 (30 hours) |
| 118697 | Hannaford | Chris | M | CO | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 117724 | Hannon | Daniel | M | New York | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 102234 | Hanschka | Whitney | M | MA | US | 8 | Canyons by UTMB 100km 2023 (18 hours) |
| 105144 | Hansel | Guillaume | M | CA | US | 8 | Transgrancanaria 125km 2023 (28 hours) |
| 117890 | HANSEN | DENNIS | M | Copenhagen | DK | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 114993 | Hansen | Jon | M | Wa | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 112598 | Hansen | Laura | F | CA | US | 2 | Bear, The 100M 2023 (36 hours) |
| 109441 | Hansez | Benoît | M | Belgium | BE | 4 | Istria by UTMB 168km 2023 (46 hours) |
| 116949 | Hanson | Andrew | M | Idaho | US | 1 | IMTUF 100M 2023 (36 hours) |
| 117350 | Hanson | Cole | M | Idaho | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 117965 | Hanson | Emily | F | MD | US | 1 | Rim to River 100M 2023 (32 hours) |
| 105729 | Hanson | Jon | M | MO | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 112370 | Hanson | Nicole | F | AZ | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 110249 | Hansson | Anders | M | Sweden | SE | 2 | Täby Extreme Challenge 100 100M 2023 (30 hours) |
| 100184 | Har Paz | Amit | M | ISR | IL | 16 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 113351 | Harada | Shoji | M | Saitama | JP | 2 | Shinetsu Five Mountains Trail 100M 2023 (33 hours) |
| 111448 | Harada | Taihei | M | Kagawa-ken | JP | 2 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 103887 | Harada | Yukihiro | M | CA | US | 8 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115395 | Harapa | Daniel | M | New South Wales | AU | 1 | Kosciusko by UTMB 100km 2022 (18 hours) |
| 107815 | Harary | Alex | M | CA | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 112944 | Harben | Luke | M | Georgia | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 103493 | Harcrow | Gina | F | CO | US | 2 | Hardrock 100M 2023 (48 hours) |
| 113992 | Hardebeck | Krista | F | New York | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 100082 | Hardeman | Vincent | M | NLD | NL | 2 | Eiger Ultra Trail 101km 2023 (23 hours) |
| 112955 | Hardes | Christoph | M | Nordrhein-Westfalen | DE | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 100141 | Hardesty | Jaime | F | CA | US | 16 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 118025 | Hardin | Chris | M | Tennessee | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 115026 | Harding | Jared | M | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 116714 | Hardman | Jessica | F | Arizona | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 101628 | Hardt | Frank | M | DEU | DE | 8 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 113367 | Hardwick | George | M | Greater London | GB | 2 | Ultra-Trail Cape Town 100M 2022 (45 hours) |
| 104973 | Hardy | Jeremy | M | CA | US | 2 | Sean O'Brien 100km 2023 (16 hours) |
| 100011 | Hardy | Jessica | F | CA | US | 8 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 116523 | Harel | Simon | M | QC | CA | 1 | Quebec Mega Trail 110km 2023 (22 hours) |
| 112945 | Harem | Robert | N | SC | US | 2 | Hardrock 100M 2023 (48 hours) |
| 111537 | Hargesheimer | Julia | F | TX | US | 2 | HOKA Bandera 100km 2023 (17 hours) |
| 116490 | Hargreaves | Pez | M | Cornwall | GB | 1 | South Downs Way 100M 2023 (30 hours) |
| 111124 | Hargreaves | Will | M | Wiltshire | GB | 2 | Race to the Stones 100km 2023 (17 hours) |
| 114148 | Harink | Ash | M | VIC | US | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 115177 | harloff | michael | M | New South Wales | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 104748 | Harner | Ben | M | IL | US | 32 | IMTUF 100M 2023 (36 hours) |
| 109741 | Harning | David | M | CO | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 107643 | Harpe | Lance | M | WA | US | 4 | Cocodona 250M 2023 (125 hours) |
| 117239 | Harper | Samuel | M | Hampshire | GB | 1 | Race to the Stones 100km 2023 (17 hours) |
| 102738 | Harrell | Robert | M | AR | US | 8 | Zion 100km 2023 (19 hours) |
| 104070 | Harrington | Christopher | M | CO | US | 64 | Black Canyon 100km 2023 (17 hours) |
| 108381 | Harris | Ben | M | OH | US | 2 | Mohican 100M 2023 (32 hours) |
| 117215 | Harris | Cody | M | PA | US | 1 | Worlds End 100km 2023 (19 hours) |
| 112376 | Harris | Danielle | F | Surrey | GB | 2 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 102353 | Harris | Kenten | M | CA | US | 8 | Leona Divide 100km 2023 (16 hours) |
| 106844 | Harris | Kevin | M | 4 | Wildstrubel by UTMB 108km 2023 (26 hours) | ||
| 114861 | Harris | Mark | M | TN | US | 1 | Zugspitz 111km 2023 (25 hours) |
| 111896 | Harrison | Dean | M | west midlnds | GB | 2 | Autumn 100M 2023 (28 hours) |
| 113445 | Harrison | Genevieve | F | Colorado | US | 2 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 116327 | Harrison | Jon | M | CO | US | 1 | Bighorn 100M 2023 (35 hours) |
| 115046 | Harrison | June | F | Cheshire | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 118671 | Harrison | Justin | M | California | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 116013 | Harshbarger | Wes | M | Montana | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 112984 | Hart | David | M | Wisconsin | US | 2 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 112256 | Hart | Jacob | M | Ohio | US | 2 | Canal Corridor 100 100M 2023 (30 hours) |
| 117077 | Hart | June | F | Taranaki | NZ | 1 | Taupo 100k 100km 2023 (17 hours) |
| 102116 | Hart | Madison | F | CO | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 114378 | Harter | Brian | M | CA | US | 2 | Rio Del Lago 100M 2023 (30 hours) |
| 118134 | Hartman | Daniel | M | MA | US | 1 | Burning River 100M 2023 (30 hours) |
| 102617 | Hartman | Samuel | M | OH | US | 2 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 118322 | Hartwig | Ryan | M | CA | US | 1 | Quicksilver 100km 2023 (17 hours) |
| 101731 | Hartz | Alli | F | OR | US | 1 | Western States 100M 2023 (30 hours) |
| 108252 | Hartzel | Nick | M | AZ | US | 2 | Tahoe 200 202M 2023 (100 hours) |
| 115311 | Harvey | Claire | F | East Sussex | GB | 1 | North Downs Way 100M 2023 (30 hours) |
| 108888 | Harvey | David | M | Alabama | US | 2 | Grindstone 100M 2023 (38 hours) |
| 114833 | Harvey | Matthew | M | New South Wales | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 114980 | Harvey | Sam | M | Other | NZ | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 112454 | Harvey | Sam | M | Somerset | GB | 2 | Race to the Stones 100km 2023 (17 hours) |
| 101119 | Hasapopoulos | Heidi | F | MN | US | 2 | Superior 100 100M 2023 (38 hours) |
| 117691 | Hasegawa | Katsushige | M | Saitama | JP | 1 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 104590 | Hashimoto | Junichi | M | JPN | JP | 4 | Oregon Cascades 100M 2023 (32:01:18) |
| 102720 | Hasman | Alexa | F | OR | US | 4 | Bigfoot 206M 2023 (100 hours) |
| 104972 | Hasse Petersen | Anders | M | DNK | DK | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 102793 | Hasselrot | Mikael | M | SWE | SE | 8 | Trail Verbier St Bernard by UTMB 140km 2023 (40 hours) |
| 106845 | Hastings | Orestes Pat | M | CO | US | 1 | Western States 100M 2023 (30 hours) |
| 118501 | Hathiramani | Raj | M | NY | US | 1 | Laurel Highlands 70.5M 2023 (20 hours) |
| 111679 | Hatley | Bonnie | F | North Carolina | US | 2 | No Business 100M 2023 (33.5 hours) |
| 118383 | Hatt | Katie | F | CO | US | 1 | Bear, The 100M 2023 (36 hours) |
| 103682 | Hattori | Shin | M | JPN | JP | 2 | Transjeju International Trail Run 112km 2023 (27 hours) |
| 116302 | Hatzis | Eleni | F | Montana | US | 1 | Beaverhead 100km 2023 (20 hours) |
| 115691 | Haubert | Donnie | M | CO | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 114017 | Haugen | Kevin | M | CA | US | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 100189 | Hauk | Don | M | TX | US | 16 | High Lonesome 100M 2023 (37 hours) |
| 116372 | Haunschmidt | Patrick | M | BC | CA | 1 | Fat Dog 120M 2023 (48 hours) |
| 101122 | Hausken | Janet | F | MN | US | 32 | Zion 100km 2023 (19 hours) |
| 105090 | Hautefeuille | Laurent | M | CA | US | 16 | Canyons by UTMB 100km 2023 (18 hours) |
| 102958 | Hawbaker III | Lyman | M | NY | US | 32 | Black Canyon 100km 2023 (17 hours) |
| 113000 | Hawes | Tom | M | WI | US | 2 | Kettle Moraine 100M 2023 (30 hours) |
| 117775 | Hawk | John | M | VA | US | 1 | Umstead 100M 2023 (30 hours) |
| 108701 | Hawk | Michelle | F | Arizona | US | 4 | Cuyamaca 100km 2023 (17 hours) |
| 100519 | Hawkes | Kenneth | M | OR | US | 8 | Mountain Lakes 100M 2023 (30 hours) |
| 117879 | Hawkes | Tony | M | WA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 113891 | Hawkins | Dale | M | CO | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 100367 | Hawkins | Jennifer | F | GA | US | 8 | No Business 100M 2023 (33.5 hours) |
| 115438 | Hawkins | Jonathan | M | Gauteng | ZA | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 103030 | Hawkins | Matt | M | TN | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 115221 | Hawkins | Ruth | F | England | GB | 1 | Autumn 100M 2023 (28 hours) |
| 105818 | Hawkins | Steve | M | AZ | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 115518 | Hawkins | Stuart | M | Georgia | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 116143 | Hawkins-Jackson | Morgan | F | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 109987 | Hawley | Bradley | M | Va | US | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 102391 | Hawn | Thomas | M | WA | US | 4 | Oregon Cascades 100M 2023 (32:01:18) |
| 115112 | Hay | Angus | M | New South Wales | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 114355 | Hay | Duncan | M | Hampshire | GB | 2 | Ultra-Trail Snowdonia by UTMB 165km 2023 (50 hours) |
| 100125 | Hay | Emerson | M | AUS | AU | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117421 | Hayato | Nishikata | M | Shizuoka-ken | JP | 1 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 117842 | Hayden | Matthew | M | Ohio | US | 1 | Mohican 100M 2023 (32 hours) |
| 115473 | Hayes | Amy | F | MI | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 116701 | Hayes | Bret | M | NC | US | 1 | Zion 100km 2023 (19 hours) |
| 111808 | Hayes | Joshua | M | PA | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 106850 | Hayes | Patrick | M | 16 | Bear, The 100M 2023 (36 hours) | ||
| 114884 | HAYGOOD | COREY | M | AZ | US | 1 | Never Summer 103km 2023 (23 hours) |
| 115560 | Haynes | Amanda | F | Otago | NZ | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 116866 | Haynes | Ashley | F | Indiana | US | 1 | Indiana 100M 2023 (30 hours) |
| 104491 | Haynes | Jesse | M | CA | US | 16 | Leona Divide 100km 2023 (16 hours) |
| 116504 | Haynes | Ray | M | NSW | AU | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 116974 | Hayter | Lindsey | F | Colorado | US | 1 | Never Summer 103km 2023 (23 hours) |
| 104241 | Hayvice | Fiona | F | NZL | NZ | 8 | Tarawera 100M 100M 2023 (36 hours) |
| 117510 | Hayward | Laura | F | CA | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 103295 | Hayward | Will | M | HKG | HK | 4 | Hong Kong 100K 100km 2023 (23 hours) |
| 117788 | Hazen | Jim | M | IL | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 105534 | Hazra | Amit | M | CA | US | 4 | Oregon Cascades 100M 2023 (32:01:18) |
| 118263 | Head | Brandon | M | TX | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 118683 | head | brian | M | NB | CA | 1 | Zion 100km 2023 (19 hours) |
| 106070 | Heady | Cynthia | F | KY | US | 8 | Grindstone 100M 2023 (38 hours) |
| 107250 | Healey | Eddy | M | East Riding of Yorkshire | GB | 4 | Hardwolds 80M 2022 (24 hours) |
| 115164 | Healy | Ian | M | Tipperary | IE | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 110545 | Healy | Matthew | M | Western Cape | ZA | 2 | Trail Alsace Grand Est by UTMB - Ultra-Trail des Païens 109km 2023 (21 hours) |
| 114497 | Healy | Megan | F | CA | US | 2 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 101207 | Hearne | Matthew | M | GBR | GB | 32 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 115154 | Heater | Zachary | M | WA | US | 1 | Zion 100km 2023 (19 hours) |
| 113011 | Heath | Ryan | M | UT | US | 2 | Wasatch Front 100M 2023 (36 hours) |
| 118306 | Heaton | Dennis | M | MN | US | 1 | Hennepin 100M 2023 (30 hours) |
| 115075 | Hebert | Arnaud | M | CA | US | 1 | Quicksilver 100km 2023 (17 hours) |
| 116745 | Hecht | Galen | M | Alaska | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 116658 | Hecht | RIck | M | Oregon | US | 1 | Mountain Lakes 100M 2023 (30 hours) |
| 107678 | Heckler | Christine | F | MI | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 110366 | Hedges | Jeremy | M | CO | US | 4 | Run Rabbit Run 100M 2023 (36 hours) |
| 114798 | Hedley | Giles | M | London | GB | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 113736 | Hedlund | Lars | M | Västerbotten | SE | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 115789 | Hedrick | Jeff | M | NV | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 112350 | Heer | Tony | M | AZ | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 116422 | Heffington | Andrew | M | AR | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 116744 | Hefner | Jayson | M | NV | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 112601 | hefzy | hebah | F | MI | US | 2 | Cuyamaca 100km 2023 (17 hours) |
| 116650 | Hegeman | Joel | M | Iowa | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 113152 | Heggie-Street | Keshia | F | NC | US | 2 | Tunnel Hill 100M 2022 (30 hours) |
| 112643 | Heideck | Daniel | M | Mecklenburg-Vorpommern | DE | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 114426 | Heidegger | Ben | M | Oregon | US | 2 | Siskiyou Outback 100km 2023 (17 hours) |
| 116593 | Heidemann | Eric | N | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 101518 | Heidemann Eriksen | Simon | M | Copenhagen | DK | 8 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 117064 | Heikkinen | Elisa | F | Uusimaa | FI | 1 | Istria by UTMB 110km 2023 (24 hours) |
| 113808 | Heimbeck | Martin | M | Alabama | US | 1 | Western States 100M 2023 (30 hours) |
| 101304 | Hein | Erich | M | GA | US | 16 | Yeti (Virginia) 100M 2023 (30 hours) |
| 102495 | Heine | Patrick | M | PA | US | 64 | Massanutten 100M 2023 (36 hours) |
| 113662 | Heinke | Matthias | M | Bavaria | DE | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 102254 | Heinl | Salynda | F | CO | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 114971 | Heinrich | Jason | M | Tn | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 107633 | Heinz | Justin | M | Ohio | US | 4 | Race to the Stones 100km 2023 (17 hours) |
| 117561 | Heinze | Bryan | M | MI | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 118562 | Heistinger | Lina | F | Zurich | CH | 1 | Swiss Alps 100km 2023 (22 hours) |
| 117663 | Heitman | Andrew | M | Illinois | US | 1 | Indiana 100M 2023 (30 hours) |
| 116950 | Helfrich | Michael | M | AB | CA | 1 | Lost Soul Ultra 100km 2023 (21 hours) |
| 113681 | Helland | Elizabeth | F | CO | US | 2 | Cuyamaca 100km 2023 (17 hours) |
| 115426 | Heller | Jillian | F | Pa | US | 1 | Eastern States 100M 2023 (36 hours) |
| 100464 | Heller | Justin | M | IL | US | 8 | Gorge Waterfalls 100km 2023 (17 hours) |
| 102250 | Hellings | Tammy | F | IL | US | 32 | Arkansas Traveler 100M 2023 (30 hours) |
| 118729 | Helms | Mike | M | CA | US | 1 | Quicksilver 100km 2023 (17 hours) |
| 103382 | Hemmen | Jennifer | F | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 118499 | Hemming | Mat | M | Dorset | GB | 1 | South Downs Way 100M 2023 (30 hours) |
| 112246 | Hempel | Matt | M | TX | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 113644 | Henckel | Kelly | F | WA | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 115454 | Henderson | John | M | GA | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 104791 | Henderson | Shaheen | F | TX | US | 8 | Bear, The 100M 2023 (36 hours) |
| 116236 | Hendrickson | Kjir | N | AZ | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 116996 | Henke | Patrick | M | NM | US | 1 | Zion 100M 2023 (36 hours) |
| 116230 | Henkelman | James | M | WI | US | 1 | Indiana 100M 2023 (30 hours) |
| 102669 | Henn | Marc | M | TX | US | 16 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 116094 | Hennigar | Stephen | M | LA | US | 1 | Grindstone 100km 2023 (18 hours) |
| 116415 | Henning | Brennan | M | Virginia | US | 1 | Hellgate 100km 2022 (17 hours) |
| 119097 | Henning | Frank | M | Gelderland | NL | 1 | Swiss Alps 100km 2023 (22 hours) |
| 118623 | Henrich | Todd | M | NY | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 105859 | Henricks | Peter | M | CA | US | 8 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 104240 | Henriksson | Oskar | M | SWE | SE | 32 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 109139 | Henriksson | Peter | M | No | SE | 4 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 119067 | Henry | Jules | M | VAUD | CH | 1 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 101320 | Henry | Susan | F | OR | US | 1 | Western States 100M 2023 (30 hours) |
| 117621 | Henry | William | M | PA | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 101718 | Henscheid | Stefan | M | DEU | DE | 8 | Grossglockner UltraTrail 110km 2023 (28 hours) |
| 104463 | Henson | Lucas | M | WI | US | 16 | Kettle Moraine 100M 2023 (30 hours) |
| 106248 | Henson | Michael | M | WA | US | 8 | Grindstone 100M 2023 (38 hours) |
| 117574 | Hepler | Clinton | M | PA | US | 1 | Massanutten 100M 2023 (36 hours) |
| 117076 | Heppell | Isaac | M | Marlborough | NZ | 1 | Taupo 100k 100km 2023 (17 hours) |
| 119058 | Her-flores | Mao | F | Ca | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 112838 | Herber | Kara | F | Michigan | US | 2 | Hennepin 100M 2023 (30 hours) |
| 109754 | Herbst | Stefan | M | Alberta | CA | 4 | Lost Soul Ultra 100km 2023 (21 hours) |
| 116204 | Herczeg | Jonathan | M | California | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 110872 | Herczog | András | M | Porto | PT | 1 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 103791 | Herdt | Ilja | M | CA | US | 8 | Gorge Waterfalls 100km 2023 (17 hours) |
| 117022 | Herhold | Zachary | M | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 109312 | Hermann | Andre | M | Texas | US | 4 | HOKA Bandera 100km 2023 (17 hours) |
| 101067 | Hernandez | Andres | M | PA | US | 64 | Run Rabbit Run 100M 2023 (36 hours) |
| 118468 | Hernandez | Emeterio | M | Alabama | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 100050 | Hernandez | Froilan | M | CA | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 118360 | Hernandez | Gilbert | M | Kansas | US | 1 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 108657 | Hernandez | Jesus | M | Ca | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 116253 | Hernandez Morales | Raul Antonio | M | San Luis Potosí | US | 1 | Oso Negro 100km 2023 (24 hours) |
| 118166 | Herrera | Chris | M | Illinois | US | 1 | Hennepin 100M 2023 (30 hours) |
| 118089 | Herrick | John | M | CO | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 107436 | Herring | Kimberly | F | VA | US | 4 | Rim to River 100M 2023 (32 hours) |
| 102322 | Herrington | Bobby | M | NC | US | 16 | Massanutten 100M 2023 (36 hours) |
| 118694 | Hersman | Brennen | M | WA | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 115873 | Herson | Taylor | M | OR | US | 1 | Mountain Lakes 100M 2023 (30 hours) |
| 118270 | HERVET | Xavier | M | Savoie | FR | 1 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 114405 | Herzog | Joe | M | CA | US | 2 | Leona Divide 100km 2023 (16 hours) |
| 111170 | Herzog | Johnathan | M | Arizona | US | 2 | San Diego 100M 2023 (32 hours) |
| 110924 | Herzog | TJ | M | CA | US | 2 | Cuyamaca 100km 2023 (17 hours) |
| 109055 | Heslop | Claire | F | ON | CA | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 105002 | Hess | Brian | M | WY | US | 2 | Bighorn 100M 2023 (35 hours) |
| 117969 | Hess | Ronald | M | Ca | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 116317 | Hester | Natalia | F | Florida | US | 1 | Hennepin 100M 2023 (30 hours) |
| 113091 | Hetherington | Mark | M | Agder | NO | 2 | Soria Moria til Verden Ende 100M 2023 (35 hours) |
| 117844 | Hetmanski | Adam | M | Wolfsbank 3 | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 109236 | Hetrick | Chad | M | OK | US | 4 | Arkansas Traveler 100M 2023 (30 hours) |
| 113977 | Hettena | David | M | CA | US | 2 | Miwok 100km 2023 (15.5 hours) |
| 104673 | Heuze | Franck | M | FRA | FR | 4 | Les Coursières des Hauts du Lyonnais 111km 2023 (22 hours) |
| 104754 | Heward | Sam | M | GBR | GB | 4 | Lakeland 100M 2023 (40 hours) |
| 116061 | Hewett | Alec | M | Colorado | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 118244 | Hewison | Mike | M | Hampshire | GB | 1 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 118245 | Hewitt | Greg | M | Utah | US | 1 | IMTUF 100M 2023 (36 hours) |
| 118858 | Hewitt | Justine | F | UT | US | 1 | IMTUF 100M 2023 (36 hours) |
| 108382 | Hewitt | Michael | M | California | US | 2 | IMTUF 100M 2023 (36 hours) |
| 103847 | Heyboer | James Peter | M | MT | US | 16 | Indiana 100M 2023 (30 hours) |
| 117398 | Hibbard | Danielle | F | SA | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 111834 | Hibbard | Travis | M | MN | US | 2 | Superior 100 100M 2023 (38 hours) |
| 103514 | Hickman | Clay | M | TN | US | 8 | Fat Dog 120M 2023 (48 hours) |
| 103510 | Hickman | Nancyanne | F | TN | US | 8 | Arkansas Traveler 100M 2023 (30 hours) |
| 100739 | Hickok | Benny | M | IN | US | 128 | Arkansas Traveler 100M 2023 (30 hours) |
| 108991 | Hickory | McKendree | F | Colorado | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 103190 | Hidaka | Yuichiro | M | JPN | JP | 8 | Bighorn 100M 2023 (35 hours) |
| 117335 | hidalgo | rafael | M | Geneva | CH | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117840 | Hiday | Lisa | F | Indiana | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 103824 | Hielscher | Wolfgang | M | DEU | DE | 8 | Istria by UTMB 110km 2023 (24 hours) |
| 110786 | Higgins | Andrew | M | Alabama | US | 4 | Pinhoti 100M 2023 (31 hours) |
| 109257 | Higgins | Devin | M | CA | US | 4 | Canyons by UTMB 100M 2023 (32 hours) |
| 101082 | Higgins | Joseph | M | PA | US | 2 | Eastern States 100M 2023 (36 hours) |
| 115345 | Higgins | Kelly | F | WI | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 109756 | Higgins | Nathan | M | MN | US | 2 | Waldo 100km 2023 (18 hours) |
| 100560 | Higgins | Richard | M | GA | US | 8 | Bear, The 100M 2023 (36 hours) |
| 103379 | Higgins | Shaun | M | CO | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 117129 | Higo | Masashi | M | Aichi | JP | 1 | Okushinano 100km 2023 (21 hours) |
| 101520 | Hihnala | Heikki | M | FIN | FI | 8 | Tor des Géants 330km 2023 (132 hours) |
| 107312 | Hilback | Daniel | M | MN | US | 4 | Bighorn 100M 2023 (35 hours) |
| 111890 | Hildebrand | Landon | M | Alberta | CA | 2 | Lost Soul Ultra 100km 2023 (21 hours) |
| 115728 | Hildie | Rachel | F | WA | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 103988 | Hildreth | Brian | M | CA | US | 32 | Zion 100km 2023 (19 hours) |
| 116988 | Hildrew | Christopher | M | Tasmania | AU | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 116846 | Hill | Alexander | M | DE | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 103830 | Hill | Brian | M | TX | US | 256 | Javelina Jundred 100M 2023 (30 hours) |
| 107555 | Hill | Dan | M | NM | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 101742 | Hill | Garren | M | TX | US | 32 | Black Canyon 100km 2023 (17 hours) |
| 114386 | Hill | Mike | M | OH | US | 2 | Grindstone 100M 2023 (38 hours) |
| 116267 | Hill | Nigel | M | Victoria | AU | 1 | Kosciusko by UTMB 100km 2022 (18 hours) |
| 118076 | Hill | Stephanie | F | VA | US | 1 | Massanutten 100M 2023 (36 hours) |
| 118192 | Hillebrand | Chris | M | NM | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 114233 | Hiller | Marshall | M | Oregon | US | 2 | Quebec Mega Trail 110km 2023 (22 hours) |
| 116665 | Hillman | Scott | M | Auckland | NZ | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 102216 | Hills | Chavet | F | CO | US | 64 | Yeti (Virginia) 100M 2023 (30 hours) |
| 107598 | Hilty | Blake | M | Washington | US | 4 | HOKA Bandera 100km 2023 (17 hours) |
| 113198 | Himbert | Caroline | F | Utah | US | 2 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 119082 | Himuro | Michiko | F | JPN | JP | 1 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 115169 | Hinds | Gareth | M | Tasmania | AU | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 108177 | Hinely | Jill | F | South Carolina | US | 4 | Tunnel Hill 100M 2022 (30 hours) |
| 112531 | Hinely | Ken | M | SC | US | 2 | Canal Corridor 100 100M 2023 (30 hours) |
| 114215 | Hinkel | Stephen | M | Colorado | US | 2 | Beaverhead 100km 2023 (20 hours) |
| 103301 | Hinkle | Carolyn | F | OH | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 101875 | Hinson | Marion | M | SC | US | 2 | Zion 100M 2023 (36 hours) |
| 116786 | Hinte-Rogers | Shelby | F | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 113632 | Hinton | Randall | M | Utah | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 101103 | Hiom | Phil | M | BC | CA | 8 | Cuyamaca 100km 2023 (17 hours) |
| 117481 | HIRSCHFELD | DAVID | M | ME | US | 1 | No Business 100M 2023 (33.5 hours) |
| 107208 | Hirschfeld | Madeline | F | Colorado | US | 2 | Bear, The 100M 2023 (36 hours) |
| 117400 | Hirst | Justin | M | PA | US | 1 | Laurel Highlands 70.5M 2023 (20 hours) |
| 114132 | Hirt | Ryan | M | PA | US | 2 | Laurel Highlands 70.5M 2023 (20 hours) |
| 113212 | Hirvela | Jeff | M | TX | US | 2 | HOKA Bandera 100km 2023 (17 hours) |
| 118681 | Hiskey | Arlee | N | VT | US | 1 | Rim to River 100M 2023 (32 hours) |
| 116833 | Hite | Kenneth | M | South Carolina | US | 1 | Cruel Jewel 106M 2023 (48 hours) |
| 104216 | Hites | Jared | M | OH | US | 8 | Rim to River 100M 2023 (32 hours) |
| 105477 | Hjelmstad | Logan | M | CO | US | 2 | IMTUF 100M 2023 (36 hours) |
| 101246 | Hjorthaug | Asgeir | M | NOR | NO | 1 | Western States 100M 2023 (30 hours) |
| 118672 | Hjukse | Gro Siljan | F | Buskerud | NO | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 118411 | Hlad | Kevin | M | WA | US | 1 | Burning River 100M 2023 (30 hours) |
| 105733 | Hlasney | Todd | M | KS | US | 8 | Bighorn 100M 2023 (35 hours) |
| 101104 | Hlynka | Anthony | M | BC | CA | 4 | Fat Dog 120M 2023 (48 hours) |
| 115773 | Ho | Michelle | F | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 115853 | Hoadley | Jennifer | F | MA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 103293 | Hoagland | Erika | F | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 115178 | Hoang Huu | Thang | M | Ha Noi | VN | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104099 | Hoban | Laura | F | WI | US | 2 | Oregon Cascades 100M 2023 (32:01:18) |
| 114931 | Hobaugh | Rich | M | TX | US | 1 | Cocodona 250M 2023 (125 hours) |
| 117180 | Hobbins | JoeJoe | M | Gloucestershire | GB | 1 | Race to the Stones 100km 2023 (17 hours) |
| 106853 | Hobbs | Hayden | M | 2 | Ultra-Trail Cape Town 100M 2022 (45 hours) | ||
| 114531 | Hobbs | Nicholas | M | North Carolina | US | 2 | Umstead 100M 2023 (30 hours) |
| 101342 | Hoberg | Rick | M | CO | US | 1 | Hardrock 100M 2023 (48 hours) |
| 100275 | Hoberg | Scott | M | MN | US | 1 | Western States 100M 2023 (30 hours) |
| 116876 | Hockensmith | Lucas | M | PA | US | 1 | Worlds End 100km 2023 (19 hours) |
| 117910 | Hockensmith | Todd | M | California | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 112527 | HOCKRIDGE | STUART | M | AZ | US | 2 | Canal Corridor 100 100M 2023 (30 hours) |
| 113139 | Hodgens | Nathan | M | California | US | 2 | Leona Divide 100km 2023 (16 hours) |
| 113580 | Hodgens | Ryan | M | Pa | US | 2 | Cuyamaca 100km 2023 (17 hours) |
| 116617 | Hodgson | Karl | M | Lancashire | GB | 1 | Lakeland 100M 2023 (40 hours) |
| 112596 | Hoeffner | Kai | M | MA | US | 2 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 118314 | Hoehn | Cassidy | M | California | US | 1 | Cascade Crest 100M 2023 (35 hours) |
| 115974 | Hoekstra | Kraig | M | AZ | US | 1 | San Diego 100M 2023 (32 hours) |
| 118728 | Hoffard | Jeff | M | Queensland | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 111581 | Hoffert | Alyssa | F | Ile-de-France | FR | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115790 | Hoffman | Andrew | M | CO | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 116884 | Hoffman | David | M | PA | US | 1 | Eastern States 100M 2023 (36 hours) |
| 118714 | Hoffman | Kincaid | M | California | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 100562 | Hoffman | Kip | M | PA | US | 8 | Eastern States 100M 2023 (36 hours) |
| 109273 | Hofmann | Michael | M | WV | US | 4 | Grindstone 100M 2023 (38 hours) |
| 119074 | Hogan | Isaac | M | NSW | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 119125 | Hogan | Jon | M | CA | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 113033 | Hogan | Kelsey | F | Newfoundland | CA | 2 | Quebec Mega Trail 100M 2023 (40 hours) |
| 100580 | Hogan | Mike | M | GBR | GB | 32 | Thames Path 100 100M 2023 (28 hours) |
| 113450 | Hogan | Shannon | F | WI | US | 2 | Grindstone 100km 2023 (18 hours) |
| 109191 | Hogan | Steve | M | Waterford | IE | 4 | Kerry Way Ultra 101km 2023 (20 hours) |
| 111644 | Hogben | Ryan | M | 74310 | FR | 2 | Zugspitz 111km 2023 (25 hours) |
| 118837 | Hogeland | Jeff | M | Alabama | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 107353 | Hogg | Ashley | M | Warwickshire | GB | 2 | Autumn 100M 2023 (28 hours) |
| 102354 | Hohman | Rick | M | OH | US | 64 | Bear, The 100M 2023 (36 hours) |
| 115023 | Hokenson | Nathan | M | CO | US | 1 | Never Summer 103km 2023 (23 hours) |
| 118778 | Holbrook | Chris | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 118441 | Holcomb | Lucas | M | Pennsylvania | US | 1 | Rim to River 100M 2023 (32 hours) |
| 100595 | Holcomb | Mark | M | IL | US | 4 | Burning River 100M 2023 (30 hours) |
| 113384 | Holcombe | Russell | M | GA | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 105116 | Holk | James | M | OR | US | 16 | Bighorn 100M 2023 (35 hours) |
| 104958 | Holland | James | M | TN | US | 8 | Zion 100M 2023 (36 hours) |
| 116563 | Holland | Jeremy | M | AR | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 102334 | Holland | Karen | F | ON | CA | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 115594 | Holland | Sarah | F | Surrey | GB | 1 | Thames Path 100 100M 2023 (28 hours) |
| 116505 | Holland | Toni | F | FL | US | 1 | Zion 100km 2023 (19 hours) |
| 118731 | HOLLANDER | GIL | M | ISRAEL | IL | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 101000 | Holliday | David | M | OH | US | 4 | Cruel Jewel 106M 2023 (48 hours) |
| 117928 | Hollis | Ann | F | KS | US | 1 | No Business 100M 2023 (33.5 hours) |
| 117474 | Hollis | Claire | F | Australian Capital Territory | AU | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 118989 | Hollis | Jacob | M | Arkansas | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 106855 | Hollister | Scott | M | CO | US | 32 | IMTUF 100M 2023 (36 hours) |
| 118781 | Holman | Emma | F | New South Wales | AU | 1 | Guzzler Ultra 100km 2023 (24 hours) |
| 118374 | Holmes | Holly | F | cornwall | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 106432 | Holmes | Joshua | M | CA | US | 32 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 101685 | Holmes | Mandie | F | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 119098 | Holmstead | Eric | M | Colorado | US | 1 | Wasatch Front 100M 2023 (36 hours) |
| 110361 | Holmstrup | Jens | M | Gentofte | DK | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115347 | Holmstrup | Mads | M | Gentofte | DK | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 116947 | Holpuch | Amy | F | Texas | US | 1 | No Business 100M 2023 (33.5 hours) |
| 100661 | Holt | Carl | M | TX | US | 8 | Brazos Bend 100M 2022 (30 hours) |
| 107242 | Holt | Jaime | F | AL | US | 4 | Cruel Jewel 106M 2023 (48 hours) |
| 115710 | Holt | Matt | M | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 116115 | Holt | Nick | M | Alberta | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 118833 | Holve | Christopher | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 108519 | Holvik | Simen | M | NA | NO | 2 | Brazil 135 135M 2023 (120 hours) |
| 115137 | Holzweg | Tom | M | Kanton Zürich | CH | 1 | Zugspitz 111km 2023 (25 hours) |
| 118329 | Homann | Jacinta | F | WA | AU | 1 | Surf Coast Century 100km 2023 (16 hours) |
| 106649 | Homyak | Patrick | M | CA | US | 4 | Wasatch Front 100M 2023 (36 hours) |
| 113420 | Hong | Eric | M | ON | CA | 1 | Western States 100M 2023 (30 hours) |
| 118346 | HONG | JONGHEE | M | gyeonggi-do | KR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 113380 | Honjo | Megumi | F | Tokyo | JP | 2 | OSJ Ontake 100km 2023 (16 hours) |
| 116028 | Hooey | Tim | M | CA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 108226 | Hooker | Alison | F | CA | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 104593 | Hooker | Michael | M | CA | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 103742 | Hooper | Bob | M | TN | US | 16 | Pinhoti 100M 2023 (31 hours) |
| 114522 | Hoover | Rene | F | Delaware | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 102077 | Hoover | Sean | M | OR | US | 128 | Waldo 100km 2023 (18 hours) |
| 111133 | Hope | Owen | M | BC | CA | 2 | Bear, The 100M 2023 (36 hours) |
| 107664 | Hopkins | Elizabeth | F | South Gloucestershire | GB | 2 | Autumn 100M 2023 (28 hours) |
| 115488 | Hopkins | Jacob | M | TN | US | 1 | Long Haul 100M 2023 (30 hours) |
| 116393 | Hopkins | Kyle | M | Colorado | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 110057 | Hopkins | Nicole | F | CO | US | 4 | Run Rabbit Run 100M 2023 (36 hours) |
| 118221 | Hopkins Taylor | Dylan | M | Nevada | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 107285 | Hopper | Dan | M | OH | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 102178 | Hopper | David | M | OR | US | 32 | Gorge Waterfalls 100km 2023 (17 hours) |
| 102478 | Horan | Pete | M | FL | US | 32 | Long Haul 100M 2023 (30 hours) |
| 118490 | Horenblas | Isaac | M | Oregon | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 112602 | Hori | Yasuaki | M | Tokyo | JP | 2 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 100394 | Horn | Austin | M | AZ | US | 32 | Black Canyon 100km 2023 (17 hours) |
| 116904 | Horn | Kevin | M | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 119108 | Horn | William | M | Pennsylvania | US | 1 | Worlds End 100km 2023 (19 hours) |
| 113144 | Hornak | Peter | M | Slovakia | SK | 2 | Javornicka 105km 2023 (24 hours) |
| 104135 | Hornbaker | Charles | M | IL | US | 16 | Hardrock 100M 2023 (48 hours) |
| 116428 | Hornbeck | Joshua | M | FL | US | 1 | Long Haul 100M 2023 (30 hours) |
| 106557 | Hornburg | Charles | M | MI | US | 16 | Black Canyon 100km 2023 (17 hours) |
| 117558 | Horne | Tyler | M | TN | US | 1 | No Business 100M 2023 (33.5 hours) |
| 110143 | Horner | John | M | NC | US | 2 | Yeti (Virginia) 100M 2023 (30 hours) |
| 103837 | Horsfall | Charmaine | F | GBR | GB | 1 | Western States 100M 2023 (30 hours) |
| 116824 | Horsford | Logan | M | Auckland | NZ | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 115260 | Horst | Daniel | M | Baden-Württemberg | DE | 1 | Nice Côte d'Azur by UTMB 111km 2023 (28 hours) |
| 116076 | Horwill | Kelvin | M | East Sussex | GB | 1 | South Downs Way 100M 2023 (30 hours) |
| 110556 | Hosking | Josiah | M | NSW | AU | 2 | Kosciusko by UTMB 100km 2022 (18 hours) |
| 104645 | Hossack | Galen | M | ZAF | ZA | 2 | Ultra-Trail Cape Town 100M 2022 (45 hours) |
| 108370 | Hotaling | Grant | M | Ca | US | 4 | High Lonesome 100M 2023 (37 hours) |
| 107317 | Houck | Sabrina | F | WA | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 107449 | Hough | Joshua | M | OR | US | 4 | Mountain Lakes 100M 2023 (30 hours) |
| 100412 | Hough | Luke | M | AL | US | 8 | Bear, The 100M 2023 (36 hours) |
| 116720 | Houghton | Matthew | M | UK | GB | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 101274 | Houghton | Rob | M | CA | US | 4 | Siskiyou Outback 100km 2023 (17 hours) |
| 114967 | HOUK | CHAD | M | VA | US | 1 | Grindstone 100M 2023 (38 hours) |
| 115014 | Houle | Jaleesa | F | NEVADA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 116758 | Hoult | Mark | M | NSW | AU | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 114947 | Houpert | Marie-Genevieve | F | Non | CA | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 103288 | House | Russell | M | CO | US | 8 | Run Rabbit Run 100M 2023 (36 hours) |
| 117592 | Houser | Josh | M | Massachusetts | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 117837 | Hovenga | Bard | M | CO | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 100331 | Howard | Amy | F | TX | US | 32 | Massanutten 100M 2023 (36 hours) |
| 110934 | Howard | Beau | M | Georgia | US | 2 | Rim to River 100M 2023 (32 hours) |
| 106325 | Howard | Darren | M | TN | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 111005 | Howard | Jim | M | California | US | 2 | Waldo 100km 2023 (18 hours) |
| 112739 | Howard | Michael | M | NC | US | 2 | Grindstone 100km 2023 (18 hours) |
| 118540 | Howell | Holly | F | NC | US | 1 | Massanutten 100M 2023 (36 hours) |
| 117402 | Howell | Kristian | M | CA | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 115535 | Howell | Laura | F | Colorado | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 100668 | Howell | Shannon | F | SC | US | 4 | Hellgate 100km 2022 (17 hours) |
| 107689 | Howland | Philip | M | UT | US | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116132 | Howlett | Riley | N | BC | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 100571 | Howson | Doug | M | AB | CA | 1 | Western States 100M 2023 (30 hours) |
| 108388 | Howton | James | M | UT | US | 2 | Bear, The 100M 2023 (36 hours) |
| 117321 | Hrastovec | Ivan | M | Savinjska dolina | SI | 1 | Julian Alps Trail Run by UTMB 170km 2023 (46 hours) |
| 115313 | Hrbek | Filip | M | Czech Republic | CZ | 1 | Krakonosova Stovka 100km 2023 (22 hours) |
| 115045 | Hricková | Veronika | F | Slovakia | SK | 1 | Letecka Stovka 104km 2023 (22 hours) |
| 104110 | Hruska | Zdenek | M | CZE | CZ | 8 | Eiger Ultra Trail 250km 2023 (90 hours) |
| 118473 | Hsu | Frances | F | OR | US | 1 | Mountain Lakes 100M 2023 (30 hours) |
| 102052 | Hsueh | Jack | M | CA | US | 4 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 116251 | Hu | Baron | M | CA | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 117972 | Hu | Rong | F | NJ | US | 1 | Grindstone 100km 2023 (18 hours) |
| 115957 | Hu | Tom | M | CO | US | 1 | Umstead 100M 2023 (30 hours) |
| 115733 | Hua | Zhaohong | M | Zhejiang | CN | 1 | Ninghai Ultra Trail 109km 2023 (24 hours) |
| 111441 | Huang | Edi | M | Singapore | SG | 2 | Tarawera 100K 102km 2023 (17 hours) |
| 110533 | Huang | Erxiong | M | CA | US | 4 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 109059 | Huang | Helen | F | NY | US | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 105395 | Huang | Hongguo | M | CHN | CN | 2 | Columbia Ultra Trail Chongli 168km 2023 (48 hours) |
| 116263 | Hubbard | Caleb | M | CA | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 115626 | Hube | Jason | M | FL | US | 1 | Long Haul 100M 2023 (30 hours) |
| 117351 | Huber | Manuel | M | Baden-Württemberg | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 118186 | Huber | Seth | M | Utah | US | 1 | Wasatch Front 100M 2023 (36 hours) |
| 112564 | Hubsher | Chad | M | Florida | US | 2 | Fat Dog 120M 2023 (48 hours) |
| 109342 | Huchingson | Jim | M | CA | US | 4 | Canyons by UTMB 100M 2023 (32 hours) |
| 104019 | Hudalla | Justin | M | MN | US | 16 | Superior 100 100M 2023 (38 hours) |
| 110381 | Hudelson | Snowbeard | M | CA | US | 4 | Canyons by UTMB 100km 2023 (18 hours) |
| 101513 | Hudgins | Alex | M | CA | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 117336 | Hudson | Eric | M | Tennessee | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 102411 | Hudson | Jill | F | WA | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 111324 | Hudson | John | M | CA | US | 2 | Canyons by UTMB 100M 2023 (32 hours) |
| 116754 | Hudson | Michael | M | CA | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 115946 | Huebner | Sarah | F | TN | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 116764 | Huerta | Efrain | M | IL | US | 1 | Hennepin 100M 2023 (30 hours) |
| 106157 | Huerta | Jorge A. | M | Michoacán | MX | 4 | Oso Negro 100km 2023 (24 hours) |
| 105015 | Hufschmidt | Laura | F | MI | US | 16 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 102858 | Huget | Jeff | M | CA | US | 8 | Rio Del Lago 100M 2023 (30 hours) |
| 104084 | Huggins | Heather | F | CA | US | 64 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 108668 | Hughes | Adam | M | MI | US | 2 | Bear, The 100M 2023 (36 hours) |
| 116060 | Hughes | Connor | M | CA | US | 1 | Leona Divide 100km 2023 (16 hours) |
| 108336 | Hughes | Dan | M | MI | US | 4 | HURT 100M 2023 (36 hours) |
| 117069 | Hughes | David | M | West Yorkshire | GB | 1 | Hardwolds 80M 2022 (24 hours) |
| 113563 | Hughes | George | M | England | GB | 2 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 109170 | Hughes | Ken | M | Berkshire | GB | 4 | Thames Path 100 100M 2023 (28 hours) |
| 107394 | Hughes | Sam | M | CA | US | 2 | Miwok 100km 2023 (15.5 hours) |
| 103880 | Hughes | Stuart | M | AUS | AU | 16 | Surf Coast Century 100km 2023 (16 hours) |
| 107204 | Hullermann | Tim | M | CO | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 117870 | Hulseman | Anna | F | CA | US | 1 | SwissPeaks 100km 2023 (28 hours) |
| 116177 | Hulsey | Joel | M | Colorado | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 104298 | Hulsizer | Jesse | M | WA | US | 8 | Cascade Crest 100M 2023 (35 hours) |
| 114835 | Hulton | David | M | WA | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 114995 | Humlie | Makenna | F | OR | US | 1 | Mountain Lakes 100M 2023 (30 hours) |
| 117169 | Humphrey | Derek | M | Buckinghamshire | GB | 1 | Thames Path 100 100M 2023 (28 hours) |
| 106346 | Humphrey | Sean | M | OH | US | 16 | Bighorn 100M 2023 (35 hours) |
| 117966 | Hundley | Sheldon | M | Alabama | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 112379 | Hungate | Scott | M | CO | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 118311 | Hungerford | Aleksandra | F | Arizona | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 116763 | Hunn | Eric | M | KS | US | 1 | Never Summer 103km 2023 (23 hours) |
| 115826 | Hunsicker | Jenn | F | CO | US | 1 | Bigfoot 206M 2023 (100 hours) |
| 101347 | Hunsucker | Matthew | M | CO | US | 1 | Western States 100M 2023 (30 hours) |
| 100732 | Hunt | Jay | M | CO | US | 8 | Pinhoti 100M 2023 (31 hours) |
| 116431 | Hunt | John-Paul | M | n/a | GB | 1 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 115664 | Hunt | Lee | M | New Mexico | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 115636 | Hunt | Liz | F | CO | US | 1 | Hennepin 100M 2023 (30 hours) |
| 102053 | Hunt | Luke | M | AL | US | 8 | Pinhoti 100M 2023 (31 hours) |
| 102674 | Hunt | Wesley | M | AR | US | 2 | Arkansas Traveler 100M 2023 (30 hours) |
| 100360 | Hunter | Dan | M | GBR | GB | 32 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 101524 | Hunter | Jonathan | M | CA | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 100799 | Hunter | Steven | M | ON | CA | 32 | Miwok 100km 2023 (15.5 hours) |
| 115775 | Huntzinger | Debbie | F | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 107438 | Hurd | Brandon | M | California | US | 4 | High Lonesome 100M 2023 (37 hours) |
| 108876 | Huriez | Clément | M | Haute Savoie | FR | 4 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 107231 | Hurl | Jeremy | M | UT | US | 4 | Waldo 100km 2023 (18 hours) |
| 108703 | Hurlbutt | Samantha | F | Pa | US | 4 | Massanutten 100M 2023 (36 hours) |
| 102426 | Hurley | Ian | M | PA | US | 16 | Grindstone 100km 2023 (18 hours) |
| 105892 | Hurley | Raymond | M | NV | US | 2 | Quicksilver 100km 2023 (17 hours) |
| 115388 | Hurliman | Phoebe | F | Western Australia | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 119033 | Hurst | Jamey | M | AL | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 107611 | Hurtado | Art | M | TX | US | 2 | Zion 100M 2023 (36 hours) |
| 116637 | Husar | Ivan | M | Nitriansky | SK | 1 | Eiger Ultra Trail 250km 2023 (90 hours) |
| 114402 | Huss | David | M | WA | US | 2 | Hardrock 100M 2023 (48 hours) |
| 100239 | Husseini | Naji | M | NC | US | 16 | High Lonesome 100M 2023 (37 hours) |
| 101355 | Huston | Jacob | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 110573 | Hutchens | Lauren | F | MI | US | 4 | Burning River 100M 2023 (30 hours) |
| 116002 | Hutcheson | David | M | NY | US | 1 | Twisted Branch 100km 2023 (20 hours) |
| 104511 | Hutchins | Kelly | M | KY | US | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 109115 | Hutchinson | G Brian | M | Dublin | IE | 4 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 117607 | Hutchison | Joel | M | Virginia | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 101703 | Hutchison | Ty | M | WA | US | 4 | Moab 238M 2023 (106 hours) |
| 115889 | Hutson | Jeremy | M | FL | US | 1 | Long Haul 100M 2023 (30 hours) |
| 118351 | Hutzel | John | M | TX | US | 1 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 103128 | Huyett | Joe | M | CO | US | 8 | Bighorn 100M 2023 (35 hours) |
| 115479 | Huzij | Frank | M | Niederösterreich | AT | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 105630 | Hyslop | Stuart | M | GBR | GB | 16 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116183 | I Colombo | Amy | F | FL | US | 1 | Long Haul 100M 2023 (30 hours) |
| 117040 | Ibanez | Michael | M | IL | US | 1 | Beaverhead 100km 2023 (20 hours) |
| 117196 | Icardo | Xavier | M | Ontario | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 106273 | Ichido | Keisuke | M | JPN | JP | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 111883 | Ick | Isaac | M | NY | US | 2 | Quicksilver 100km 2023 (17 hours) |
| 100143 | Ickringill | David | M | ESP | ES | 1 | Autumn 100M 2023 (28 hours) |
| 107286 | Ieuter | William | M | IL | US | 4 | Hardrock 100M 2023 (48 hours) |
| 112617 | Igami | Tomoko | F | Aichi | JP | 2 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 102502 | Igusa | Tom | M | NZL | NZ | 64 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 101025 | Ihara | Tomokazu | M | JPN | JP | 1 | Wasatch Front 100M 2023 (36 hours) |
| 118840 | Ihnot | Steve | M | CO | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 118371 | Iho | Satu | F | Vaud | CH | 1 | SwissPeaks 360km 2023 (156 hours) |
| 118716 | IIDA | Shinichi | M | Chiba | JP | 1 | Okushinano 100km 2023 (21 hours) |
| 113813 | Ikeda | Yuka | F | Kanagawa | JP | 2 | Doi Inthanon Thailand by UTMB 104km 2022 (30 hours) |
| 100224 | Iles | Aaron | M | MD | US | 4 | Eastern States 100M 2023 (36 hours) |
| 118135 | Ilhan | Metin Can | M | Ontario | CA | 1 | Grindstone 100km 2023 (18 hours) |
| 105173 | Ilunze | Robert | M | FRA | FR | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 107872 | Imhoff | Kyle | M | CA | US | 4 | Canyons by UTMB 100M 2023 (32 hours) |
| 103273 | Inanaga | Yusuke | M | JPN | JP | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118432 | Ingemarsdotter | Anna | F | Stockholm | SE | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 113929 | Ingram | Corinne | F | MD | US | 2 | Rim to River 100M 2023 (32 hours) |
| 109459 | Innocenti | Mark | M | Hertfordshire | GB | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 108681 | Inouye | Meggie | F | CA | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 116015 | Inzaurralde | Gonzalo | M | Lavalleja | UY | 1 | Ultra Trail Amanecer Comechingón 134km 2023 (36 hours) |
| 113348 | Ionce | Florin Adrian | M | Cluj | RO | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 100718 | Iosa | Jeff | M | FL | US | 16 | Black Canyon 100km 2023 (17 hours) |
| 105441 | Ireland | Lee | M | GBR | GB | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116698 | Irizar | Guillermo | M | Buenos Aires | AR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 115647 | Irmer | Michael | M | Niedersachsen | DE | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 108314 | Irons | Thomas | M | CA | US | 4 | Zion 100M 2023 (36 hours) |
| 100608 | Irving | Stephanie | F | WA | US | 64 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118027 | Irwin | Joe | M | CO | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 105508 | Isabella | Bennett | M | MN | US | 8 | Superior 100 100M 2023 (38 hours) |
| 107133 | Isenberg | Rebekah | F | 4 | Canyons by UTMB 100M 2023 (32 hours) | ||
| 106865 | Ishiduka | Jiro | M | 4 | High Lonesome 100M 2023 (37 hours) | ||
| 117967 | ishikawa | augusto | M | sao paulo | BR | 1 | High Lonesome 100M 2023 (37 hours) |
| 115718 | ISHIO | KAZUTAKA | M | tokyo | JP | 1 | Tor des Géants 330km 2023 (132 hours) |
| 115778 | Isom | Barb | F | Michigan | US | 1 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 115093 | Isom | Megan | F | CA | US | 1 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 113836 | ISOMURA | Shinsuke | M | Kanagawa | JP | 2 | Ultra-Trail Snowdonia by UTMB 165km 2023 (50 hours) |
| 118384 | Israelsen | Ian | M | PA | US | 1 | Rim to River 100M 2023 (32 hours) |
| 103564 | Issenbeck | Cedric | M | FRA | FR | 8 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 108882 | Ithurburn | Ashlie | F | AL | US | 2 | Tahoe 200 202M 2023 (100 hours) |
| 111432 | Ito | Yuki | M | Hirakatashi | JP | 2 | Gran Trail Courmayeur 100km 2023 (28 hours) |
| 110609 | Ives | Jace | M | Oregon | US | 2 | Siskiyou Outback 100km 2023 (17 hours) |
| 101612 | Ivie | Brian | M | CA | US | 2 | Sean O'Brien 100km 2023 (16 hours) |
| 103409 | Iwama | Hiroyuki | M | Yamanashi | JP | 8 | Canyons by UTMB 100M 2023 (32 hours) |
| 115419 | Iwata | Shohei | M | Kyoto | JP | 1 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 113589 | Iwatare | Shin | M | Tokyo | JP | 2 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 115282 | Iwersen | Jesper | M | Capital Region | DK | 1 | Soria Moria til Verden Ende 100M 2023 (35 hours) |
| 114321 | Ixcot Yon | Carlos Aberto | M | Guatemala | GT | 2 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 118038 | Iyer | Ganesh | M | CA | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 115654 | Iyori | Makoto | M | 809,goji,yumesaki-cho | JP | 1 | OSJ Ontake 100km 2023 (16 hours) |
| 117864 | Izquierdo Juando | Roger | M | Spain | ES | 1 | Transgrancanaria 125km 2023 (28 hours) |
| 111758 | jack | ian | M | London | GB | 2 | Thames Path 100 100M 2023 (28 hours) |
| 103754 | Jackson | Ben | M | CO | US | 8 | Leadville Trail 100M 2023 (30 hours) |
| 111955 | Jackson | Cody | M | WA | US | 2 | Gorge Waterfalls 100km 2023 (17 hours) |
| 116601 | Jackson | David | M | Massachusetts | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 103271 | Jackson | Jacob | M | CA | US | 16 | Burning River 100M 2023 (30 hours) |
| 114959 | Jackson | Jason | M | SD | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 117119 | Jackson | Kate | F | New South Wales | AU | 1 | Guzzler Ultra 100km 2023 (24 hours) |
| 115743 | Jackson | Mac | M | Florida | US | 1 | Long Haul 100M 2023 (30 hours) |
| 108207 | Jackson | Matthew | M | AR | US | 4 | Arkansas Traveler 100M 2023 (30 hours) |
| 111260 | Jackson | Paul | M | Flintshire | GB | 2 | Autumn 100M 2023 (28 hours) |
| 100063 | Jackson | William | M | WI | US | 1 | Western States 100M 2023 (30 hours) |
| 109840 | Jacobs | Henry | M | Washington | US | 4 | Rio Del Lago 100M 2023 (30 hours) |
| 103741 | Jacobs | Paul | M | DC | US | 32 | Grindstone 100km 2023 (18 hours) |
| 101939 | Jacobs | Scotie | M | NY | US | 4 | Twisted Branch 100km 2023 (20 hours) |
| 106519 | Jacquet | Jonas | M | DEU | DE | 2 | Julian Alps Trail Run by UTMB 106km 2023 (24 hours) |
| 107942 | Jacquot | Brice | M | Vosges | FR | 1 | Eiger Ultra Trail 250km 2023 (90 hours) |
| 102201 | Jaegersen | Peter | M | OR | US | 16 | Georgia Death Race 74M 2023 (23 hours) |
| 114827 | Jaeggi | Marco | M | Bern | CH | 1 | SwissPeaks 360km 2023 (156 hours) |
| 115787 | Jagielski | Jack | M | Minnesota | US | 1 | No Business 100M 2023 (33.5 hours) |
| 115767 | Jaime | Scott | M | CO | US | 1 | Zugspitz 111km 2023 (25 hours) |
| 100158 | Jalmin | Loic | M | FRA | FR | 32 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 110113 | James | Andrew | M | Ontario | CA | 1 | Quebec Mega Trail 110km 2023 (22 hours) |
| 113598 | James | Brian | M | North Carolina | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 115858 | James | Caspian | M | Flintshire | GB | 1 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 107187 | James | Elizabeth | F | Georgia | US | 2 | Pinhoti 100M 2023 (31 hours) |
| 107218 | James | Michael | M | NC | US | 4 | Cruel Jewel 106M 2023 (48 hours) |
| 108511 | James | Michael | M | NSW | AU | 2 | Kosciusko by UTMB 100M 2022 (36 hours) |
| 117810 | James | Tom | M | Queensland | AU | 1 | Kosciusko by UTMB 100M 2022 (36 hours) |
| 116281 | James | Tony | M | Bristol | GB | 1 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 119075 | James | Tyler | M | VIC | AU | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 116062 | Jamieson | Teddy | M | CO | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 102249 | Janacek | Michal | M | N/A | CZ | 32 | Leadville Trail 100M 2023 (30 hours) |
| 113590 | Janaszak | Alisha | F | MN | US | 2 | Superior 100 100M 2023 (38 hours) |
| 118340 | Jandering | Anders | M | Västra Götaland | SE | 1 | Trail Alsace Grand Est by UTMB - Ultra-Trail des Païens 109km 2023 (21 hours) |
| 115003 | Jang | Youngcho | M | Danwon-gu | KR | 1 | Transjeju International Trail Run 112km 2023 (27 hours) |
| 101489 | Janisch | Austin | M | CA | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 117349 | Jankowski | John | M | CA | US | 1 | Łemkowyna Ultra-Trail 150km 2023 (35 hours) |
| 114581 | Jannetta | Andrew | M | Fife | GB | 2 | Julian Alps Trail Run by UTMB 106km 2023 (24 hours) |
| 112773 | Jannon | Eric | M | CA | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 115927 | Janovick | Isabella | F | ID | US | 1 | Bear, The 100M 2023 (36 hours) |
| 114958 | Janowski | Mariusz | M | Polish | PL | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 100700 | Jantz | Rachel | F | MI | US | 2 | Kettle Moraine 100M 2023 (30 hours) |
| 111291 | Janulaitis | Lukas | M | MA | US | 2 | Swiss Alps 100M 2023 (49 hours) |
| 104565 | Jaqua | Nate | M | OR | US | 32 | HURT 100M 2023 (36 hours) |
| 115086 | Jara | William | M | Connecticut | US | 1 | Burning River 100M 2023 (30 hours) |
| 112645 | Jaros | Todd | M | Ohio | US | 2 | Mohican 100M 2023 (32 hours) |
| 116864 | jarry | aurelien | M | qc | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 116489 | Jaskiewicz | Erin | F | PA | US | 1 | Worlds End 100km 2023 (19 hours) |
| 117381 | Jason | POILANE | M | France | FR | 1 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 115130 | Jatczak | Scott | M | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 108917 | Jauch | Kelly | M | Wisconsin | US | 4 | Laurel Highlands 70.5M 2023 (20 hours) |
| 117389 | Jaworski | Elsa | F | Utah | US | 1 | Tahoe 200 202M 2023 (100 hours) |
| 102455 | Jay | Alyson | F | AZ | US | 4 | Cocodona 250M 2023 (125 hours) |
| 101156 | Jay | Colleen | F | NC | US | 64 | Cascade Crest 100M 2023 (35 hours) |
| 105524 | Jay | Luke | M | CO | US | 64 | Puerto Vallarta México by UTMB 100km 2023 (18 hours) |
| 116309 | Jay | Samuel | M | New Mexico | US | 1 | Grindstone 100km 2023 (18 hours) |
| 114796 | JEAN | DOMINIQUE | M | LOIRET | FR | 1 | Grand Raid La Reunion 162km 2023 (50 hours) |
| 117519 | Jędrachowicz | Maciej | M | łódzkie | PL | 1 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 103862 | Jefferson | Lauren | F | VA | US | 4 | HOKA Bandera 100km 2023 (17 hours) |
| 113196 | Jelinek | April | F | CT | US | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117273 | Jemlich | Björn Lars | M | Schleswig-Holstein | DE | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 111377 | Jemlich | Silke | F | Schleswig-Holstein | DE | 2 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 101402 | Jenkins | Alicia | F | WA | US | 4 | Cocodona 250M 2023 (125 hours) |
| 114800 | Jenkins | Paul | M | Denbighshire | GB | 1 | Ultra-Trail Snowdonia by UTMB 100km 2023 (28 hours) |
| 107292 | jenkins | scott | M | London | GB | 4 | Tahoe 200 202M 2023 (100 hours) |
| 104512 | Jenks | Colin | M | CO | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 119091 | Jennings | Emma | F | Wicklow | IE | 1 | Tor des Géants 330km 2023 (132 hours) |
| 112051 | Jennings | Mariela | F | California | US | 2 | San Diego 100M 2023 (32 hours) |
| 115530 | Jennings | Morgan | F | IL | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 113870 | Jennison | Erica | F | CA | US | 2 | Pine to Palm 100M 2023 (34 hours) |
| 108197 | Jensen | Aaron | M | Utah | US | 4 | Cuyamaca 100km 2023 (17 hours) |
| 118121 | Jensen | Anne | F | UT | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 113042 | jensen | jeff | M | ut | US | 2 | Zion 100M 2023 (36 hours) |
| 107134 | Jensen | Julie | F | CA | US | 8 | Sean O'Brien 100km 2023 (16 hours) |
| 111253 | Jensen | Justin | M | ID | US | 2 | Beaverhead 100km 2023 (20 hours) |
| 118199 | Jensen | Tayson | M | UT | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 117031 | Jensen | Todd | M | CA | US | 1 | Beaverhead 100km 2023 (20 hours) |
| 108210 | Jensen | Tony | M | NV | US | 2 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 102506 | Jenson | Jeremiah | M | CO | US | 2 | Never Summer 103km 2023 (23 hours) |
| 106128 | Jerez Vidal | Miguel Angel | M | ESP | ES | 8 | Ultra Trail Bosques del Sur 106km 2023 (22 hours) |
| 107963 | Jesson | Maree | F | Northamptonshire | GB | 4 | Race to the Stones 100km 2023 (17 hours) |
| 116066 | Jevahirian | Nick | M | Michigan | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 111506 | Jevne | Jørgen | M | Oslo | NO | 2 | Salomon Xreid Trollheimen 120km 2023 (35 hours) |
| 117503 | Jewell | aaron | M | Hampshire | GB | 1 | South Downs Way 100M 2023 (30 hours) |
| 115250 | Jewell | Daniel | M | Wiltshire | GB | 1 | Race to the Stones 100km 2023 (17 hours) |
| 111436 | Ježková | Jaroslava | F | Česká republika | CZ | 2 | Istria by UTMB 110km 2023 (24 hours) |
| 107431 | Jia | Haiyan | M | CA | US | 4 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 116217 | Jia | Weiping | M | Hessen | DE | 1 | Trail Alsace Grand Est by UTMB - Ultra-Trail des Païens 109km 2023 (21 hours) |
| 110106 | jiang | feng | M | CA | US | 4 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 116942 | Jiang | Jack | M | NSW | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 114755 | Jiang | Nancy | F | Nelson | NZ | 1 | Western States 100M 2023 (30 hours) |
| 116234 | jickling | kevin | M | British Columbia | CA | 1 | Fat Dog 120M 2023 (48 hours) |
| 114707 | jiganti | max | M | OR | US | 1 | Zion 100M 2023 (36 hours) |
| 100599 | Jin | Ge | M | Beijing | CN | 8 | Columbia Ultra Trail Chongli 168km 2023 (48 hours) |
| 113041 | Jing | Jian | M | CO | US | 2 | Bear, The 100M 2023 (36 hours) |
| 103520 | Jirak | Ales | M | Brandenburg | DE | 64 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 106869 | Joao | Rodrigo | M | Rio de Janeiro | BR | 4 | Vulcano Ultra Trail 100km 2022 (24 hours) |
| 117722 | Jodrey | Nora | F | MD | US | 1 | Grindstone 100km 2023 (18 hours) |
| 117254 | Joe | DeShawna | F | Utah | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 107588 | Joelsson | Erik | M | CA | US | 4 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 114992 | Joffrain | Thierry | M | TX | US | 1 | Brazos Bend 100M 2022 (30 hours) |
| 115219 | Johan | Fernandez | M | Rhône Alpes | US | 1 | La H.O.T. du Père Noël 133km 2022 (25 hours) |
| 117578 | Johannes | David | M | Washington | US | 1 | Cascade Crest 100M 2023 (35 hours) |
| 103518 | Johannes | Sönke | M | CHE | CH | 16 | Zugspitz 111km 2023 (25 hours) |
| 109819 | Johannessen | Tom | M | *Ikke relevant | NO | 4 | Soria Moria til Verden Ende 100M 2023 (35 hours) |
| 108642 | Johansson | Johan | M | Skåne | SE | 2 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 118273 | Johansson | Robert | M | Västmanland | US | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 114910 | johnson | aaron | M | MI | US | 1 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 108417 | Johnson | Aaron | M | CA | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 107926 | Johnson | Andrew | M | Utah | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 117620 | Johnson | Anne | F | CA | US | 1 | Hennepin 100M 2023 (30 hours) |
| 101257 | Johnson | Bertram | M | VT | US | 32 | High Lonesome 100M 2023 (37 hours) |
| 106160 | Johnson | Brandon | M | MN | US | 4 | IMTUF 100M 2023 (36 hours) |
| 116021 | Johnson | Brandon | M | TN | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 115872 | Johnson | Brandon | M | GA | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 115327 | Johnson | Brandon | M | IN | US | 1 | Ultra-Trail Cape Town 100km 2022 (21 hours) |
| 118611 | Johnson | Brenda | F | SC | US | 1 | Indiana 100M 2023 (30 hours) |
| 109022 | Johnson | Brett | M | AK | US | 4 | Cruel Jewel 106M 2023 (48 hours) |
| 118122 | Johnson | Brian | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 108431 | Johnson | Bridget | F | Wellington | NZ | 4 | Surf Coast Century 100km 2023 (16 hours) |
| 118410 | Johnson | Bruce | M | DC | US | 1 | Never Summer 103km 2023 (23 hours) |
| 110681 | Johnson | Cary | M | MN | US | 2 | Gorge Waterfalls 100km 2023 (17 hours) |
| 113528 | Johnson | Clifford | M | Ohio | US | 2 | Tunnel Hill 100M 2022 (30 hours) |
| 100574 | Johnson | Clint | M | GA | US | 8 | Cruel Jewel 106M 2023 (48 hours) |
| 107696 | Johnson | Eric | M | Arizona | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 118713 | Johnson | Eric | M | ID | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 112109 | Johnson | Jessi | F | MN | US | 2 | Bighorn 100M 2023 (35 hours) |
| 115482 | Johnson | Jessica | F | London | GB | 1 | Endurance Trail des Templiers 105km 2023 (19 hours) |
| 117659 | Johnson | Joel | M | TX | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 118658 | johnson | joshua | M | INDIANA | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 114408 | Johnson | Kenan | M | North Carolina | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 116768 | Johnson | Kim | F | AR | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 108499 | Johnson | Mark | M | MN | US | 4 | Superior 100 100M 2023 (38 hours) |
| 108112 | Johnson | Matthew | M | Georgia | US | 2 | Georgia Death Race 74M 2023 (23 hours) |
| 115963 | Johnson | Matthew | M | TX | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 115945 | Johnson | Melissa | F | CA | US | 1 | Wasatch Front 100M 2023 (36 hours) |
| 102032 | Johnson | Patrick | M | ND | US | 8 | Javelina Jundred 100M 2023 (30 hours) |
| 101733 | Johnson | Paul | M | MI | US | 4 | Cocodona 250M 2023 (125 hours) |
| 118237 | Johnson | Paul | M | RI | US | 1 | Canyons by UTMB 100M 2023 (32 hours) |
| 109508 | Johnson | Ryan | M | Maryland | US | 4 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 101529 | Johnson | Shaun | M | NY | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 102514 | Johnson | Shelby | F | CA | US | 8 | Grindstone 100M 2023 (38 hours) |
| 113404 | johnson | trevor | M | ca | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 102817 | Johnson | Warren | M | FL | US | 16 | Zion 100M 2023 (36 hours) |
| 117267 | Johnston | Alexa | F | BC | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 103687 | Johnston | Christoffer | M | NJ | US | 4 | Twisted Branch 100km 2023 (20 hours) |
| 115555 | Johnston | Sydney | F | Colorado | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 118120 | Johnston | Tyler | M | OH | US | 1 | Beaverhead 100km 2023 (20 hours) |
| 115517 | Jokano | Urko | M | Gipuzkoa | ES | 1 | Ultra Trail Bosques del Sur 106km 2023 (22 hours) |
| 106101 | Jolie | Mike | M | AB | CA | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 116789 | Jolliffe | Max | M | CA | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 114060 | Jonáš | Richard | M | Bratislava | SK | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 115721 | Jonczyk | Wojciech | M | Illinois | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 114928 | Jones | Benjamin | M | CO | US | 1 | Never Summer 103km 2023 (23 hours) |
| 104094 | Jones | Chris | M | CA | US | 32 | Bear, The 100M 2023 (36 hours) |
| 111373 | Jones | Colby | M | Wa | US | 2 | Cascade Crest 100M 2023 (35 hours) |
| 116396 | Jones | David | M | HIGHLANDS | GB | 1 | West Highland Way 95M 2023 (30 hours) |
| 100131 | Jones | Dick | M | GBR | GB | 2 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 105423 | Jones | Dominic | M | GBR | GB | 16 | Autumn 100M 2023 (28 hours) |
| 111809 | Jones | Doug | M | MD | US | 2 | HOKA Rocky Raccoon 100M 2023 (30 hours) |
| 115179 | Jones | Dylan | M | California | US | 1 | Quicksilver 100km 2023 (17 hours) |
| 119046 | Jones | Elle | F | Utah | US | 1 | Moab 238M 2023 (106 hours) |
| 101182 | Jones | Iain | M | TN | US | 64 | Javelina Jundred 100M 2023 (30 hours) |
| 118569 | Jones | Josh | M | MD | US | 1 | Massanutten 100M 2023 (36 hours) |
| 115096 | jones | julesha | F | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 114024 | Jones | Kevan | M | Buckinghamshire | GB | 2 | Race to the Stones 100km 2023 (17 hours) |
| 113949 | jones | kyle | M | co | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 115923 | Jones | Laurel | F | Pennsylvania | US | 1 | Grindstone 100km 2023 (18 hours) |
| 100307 | Jones | Lauren | F | GA | US | 1 | Western States 100M 2023 (30 hours) |
| 111425 | Jones | Lesly Kathleen | F | New South Wales | AU | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 117671 | Jones | Lizzie | F | UT | US | 1 | Tahoe 200 202M 2023 (100 hours) |
| 103171 | Jones | Lyn | M | ON | CA | 64 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 118502 | Jones | Matt | M | MI | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 112802 | Jones | Matthew | M | WI | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 110186 | Jones | Michael | M | NSW | AU | 2 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 116664 | jones | neil | M | Bc | CA | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 108229 | Jones | Rebecca | F | TN | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 110254 | Jones | Sandy | F | Virginia | US | 2 | Yeti (Virginia) 100M 2023 (30 hours) |
| 105468 | Jones | Sebastian | M | GBR | GB | 16 | North Downs Way 100M 2023 (30 hours) |
| 113350 | Jones | Tim | M | WORCS | GB | 2 | Trail Verbier St Bernard by UTMB 140km 2023 (40 hours) |
| 107374 | Jones | Will | M | Tn | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 117706 | Jonkers | Menno | M | Noord-Holland | NL | 1 | Gran Trail Courmayeur 100km 2023 (28 hours) |
| 101352 | Jonson | Kristoffer | M | WA | US | 4 | Cuyamaca 100km 2023 (17 hours) |
| 110028 | Jónsson | Jón | M | Reykjavík | IS | 4 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116374 | Jonsson | Thomas | M | CA | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 118328 | Jonsson | Thomas | M | Jämtland | SE | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 102154 | Jordan | Ethan | M | OR | US | 8 | Gorge Waterfalls 100km 2023 (17 hours) |
| 104475 | Jordan | Jeffrey | M | TN | US | 8 | Leadville Trail 100M 2023 (30 hours) |
| 109633 | Jordan | Josh | M | WI | US | 4 | Run Rabbit Run 100M 2023 (36 hours) |
| 111972 | Jordan | Kevin | M | VA | US | 1 | Western States 100M 2023 (30 hours) |
| 111729 | Jorgensen | Bret | M | WA | US | 2 | Pine to Palm 100M 2023 (34 hours) |
| 118815 | Jorgensen | Heidi | F | Arizona | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 108837 | Jorquera Mestres | Albert | M | Catalonia | ES | 4 | Puerto Vallarta México by UTMB 100km 2023 (18 hours) |
| 118102 | Josefsson | Jenny | F | Stockholm | SE | 1 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 110209 | Joshi | Piyush | M | Washington | US | 4 | Oregon Cascades 100M 2023 (32:01:18) |
| 113877 | Jouglet | Tyson | M | AL | US | 2 | Pinhoti 100M 2023 (31 hours) |
| 111513 | Joy | Brendan | M | Kerry | IE | 2 | Kerry Way Ultra 101km 2023 (20 hours) |
| 104824 | Joyner | Rebecca | F | MI | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 108463 | Juda | Witold | M | woj. dolnośląskie | PL | 4 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 117274 | JUILLARD | Julien | M | Gard | FR | 1 | Ultra Trail du Saint-Jacques by UTMB 123km 2023 (26 hours) |
| 109505 | Julisson | Gunnar | M | Reykjavik | US | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 109492 | Jurasits | Michael | M | MN | US | 4 | Leona Divide 100km 2023 (16 hours) |
| 107848 | Jurcik | Juraj | M | Bratislavsky kraj | SK | 4 | Ultra Trail Vipava Valley 106km 2023 (25 hours) |
| 117873 | Jurkutat | Frank | M | Niedersachsen | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 100973 | Jurynec | Mick | M | UT | US | 64 | Bear, The 100M 2023 (36 hours) |
| 117859 | Jutz | Joachim | M | Bavaria | DE | 1 | Grossglockner UltraTrail 110km 2023 (28 hours) |
| 118224 | Juvala | Markus | M | Helsinki | FI | 1 | Ultra-Trail Snowdonia by UTMB 165km 2023 (50 hours) |
| 116148 | Juza | Tyler | M | HI | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 101684 | Kabanuck | Richard | M | FL | US | 32 | Pinhoti 100M 2023 (31 hours) |
| 110417 | Kabra | Aashish | M | CO | US | 2 | Bear, The 100M 2023 (36 hours) |
| 116420 | Kaczynski | Patrick | M | Deutschland | DE | 1 | Swiss Alps 100km 2023 (22 hours) |
| 104069 | Kadosh | Shlomo | M | ISR | IL | 16 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117806 | Kahn | Barry | M | TX | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 118911 | kai | noriaki | M | Hyougo | JP | 1 | Shinetsu Five Mountains Trail 100M 2023 (33 hours) |
| 114991 | Kail | Olivia | F | CO | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 116476 | Kainz | Robin | M | Upper Austria | AT | 1 | Grossglockner UltraTrail 110km 2023 (28 hours) |
| 115491 | Kalbus | Kyle | M | TN | US | 1 | High Lonesome 100M 2023 (37 hours) |
| 116012 | Kalina | Eric | M | FL | US | 1 | Long Haul 100M 2023 (30 hours) |
| 117431 | Kalkman | Rachel | F | British Columbia | CA | 1 | Lost Soul Ultra 100km 2023 (21 hours) |
| 113582 | Kallembach | Corey | M | CO | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 118452 | KALMAR | ROI | M | Israel | IL | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 115397 | Kalous | Bastian | M | Bayern | US | 1 | Zugspitz 111km 2023 (25 hours) |
| 113203 | Kaltoft-Tirevoll | Yngve Johan | M | Oppland | NO | 2 | Soria Moria til Verden Ende 100M 2023 (35 hours) |
| 111714 | Kaluka | Jesse | M | NC | US | 2 | Umstead 100M 2023 (30 hours) |
| 101111 | Kam | Max | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 106140 | Kamages | Alex | M | CA | US | 8 | Pine to Palm 100M 2023 (34 hours) |
| 109003 | Kambach | Brandon | M | FL | US | 4 | Georgia Death Race 74M 2023 (23 hours) |
| 117051 | Kameda | Atsushi | M | tokyo | JP | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 100314 | Kamendy | Marian | M | SVK | SK | 2 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 118337 | Kaminski | Kayla | F | ONTARIO | CA | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 118111 | Kamiya | Hideto | M | Tokyo | JP | 1 | Okushinano 100km 2023 (21 hours) |
| 115469 | Kampakis | Vasileios | M | Thessaloniki | GR | 1 | Madeira Island Ultra-Trail 2023 115km 2023 (29 hours) |
| 112250 | Kanarr | Kirsten | F | CA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 112654 | Kane | Abraham | M | Michigan | US | 2 | Canal Corridor 100 100M 2023 (30 hours) |
| 100964 | Kane | Andrea | F | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 115926 | Kangas | Ryan | M | CO | US | 1 | Never Summer 103km 2023 (23 hours) |
| 115187 | Kangsadjaja | Ferry | M | DKI Jakarta | ID | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 116343 | Kania | Dave | M | CA | US | 1 | Sean O'Brien 100km 2023 (16 hours) |
| 118310 | Kanjanasuttiyakorn | Threerawat | M | Bangkok | TH | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117225 | Kannan | Tejas | M | California | US | 1 | Hennepin 100M 2023 (30 hours) |
| 110493 | Kanwischer | Derek | M | MT | US | 4 | Bear, The 100M 2023 (36 hours) |
| 116291 | Karcak | Juraj | M | Slovakia | SK | 1 | Letecka Stovka 104km 2023 (22 hours) |
| 111362 | Kardash | Mariia | F | Kyiv | UA | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 109731 | Kardis | Theodore | M | Kansas | US | 2 | Tunnel Hill 100M 2022 (30 hours) |
| 106876 | Karhula | Kari | M | Finland | FI | 16 | Nuts Ylläs Pallas 105km 2023 (22 hours) |
| 113431 | Karli | Benjamin | M | Bern | CH | 2 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 111180 | Karpinski | Jason | M | PA | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 115550 | Karrer | Beat | M | Graubünden | CH | 1 | SwissPeaks 170km 2023 (58 hours) |
| 118646 | Karthan | Sam | M | California | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 101061 | Kascsak | Jacob | M | PA | US | 4 | Worlds End 100km 2023 (19 hours) |
| 108409 | Kasow | Lindsay | F | California | US | 4 | San Diego 100M 2023 (32 hours) |
| 116107 | Kasper | Michael | M | Illinois | US | 1 | Indiana 100M 2023 (30 hours) |
| 116388 | Kast | Benjamin | M | MT - Montana | US | 1 | Beaverhead 100km 2023 (20 hours) |
| 105586 | Kasteler | Cameron | M | UT | US | 2 | Wasatch Front 100M 2023 (36 hours) |
| 117876 | Katelhon | Tom | M | PA | US | 1 | Laurel Highlands 70.5M 2023 (20 hours) |
| 111332 | Katers | Jan | M | Queensland | AU | 2 | Blackall 100K 100km 2023 (18 hours) |
| 115427 | Katsikis | Athanasios | M | KARDITSA | GR | 1 | Olympus Mythical Trail 110km 2023 (28 hours) |
| 104564 | Kauffman | Mark | M | CA | US | 32 | Canyons by UTMB 100km 2023 (18 hours) |
| 107381 | Kauffman | Mary | F | Tennessee | US | 2 | Grindstone 100km 2023 (18 hours) |
| 111474 | Kaufmann | Gerhard | M | Vorarlberg | AT | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104056 | Kauri | Roni | M | WA | US | 16 | Quicksilver 100km 2023 (17 hours) |
| 101452 | Kautz | Stefanie | F | OR | US | 4 | Siskiyou Outback 100km 2023 (17 hours) |
| 116471 | Kavanagh | Patrick | M | AZ | US | 1 | High Lonesome 100M 2023 (37 hours) |
| 107543 | Kawai | Tatsuya | M | CA | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 113577 | Kawai | Tomoko | F | Tokyo | JP | 2 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 115756 | Kawakami | Naoaki | M | Ibaraki | JP | 1 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 114182 | Kawasaki | Takamaru | M | Tokyo | JP | 2 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 118823 | Kawauchi | Jumpei | M | Kanagawa | JP | 1 | Shinetsu Five Mountains Trail 110km 2023 (20 hours) |
| 112906 | Kay | Sharlota | F | NY | US | 2 | Grindstone 100M 2023 (38 hours) |
| 116413 | Kayabolen | Alisan | M | Massachusetts | US | 1 | Grindstone 100M 2023 (38 hours) |
| 115619 | Kayes | Matthew | M | PA | US | 1 | Eastern States 100M 2023 (36 hours) |
| 104200 | Kaysiewicz | Maciej | M | POL | PL | 16 | Tarawera 100K 102km 2023 (17 hours) |
| 113887 | Kazachkov | Alvin | M | Texas | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 102284 | Kazimierski | Michal | M | DEU | DE | 2 | Tarawera 100K 102km 2023 (17 hours) |
| 106153 | Kazukawa | Junko | F | CO | US | 2 | Bighorn 100M 2023 (35 hours) |
| 116433 | Kean | Thomas | M | WA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 118060 | Keane | Deirdre | F | NY | US | 1 | Eiger Ultra Trail 101km 2023 (23 hours) |
| 103082 | Kearns | Laura | F | AR | US | 8 | Arkansas Traveler 100M 2023 (30 hours) |
| 108296 | Kearon | Samuel | M | ACT | US | 4 | Tarawera 100K 102km 2023 (17 hours) |
| 108787 | keating | mark | M | TX | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 104575 | Keating | Pete | M | WA | US | 8 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 108046 | Keatley | David | M | CA | US | 4 | Beaverhead 100km 2023 (20 hours) |
| 104842 | Keats | Mark | M | OR | US | 8 | Cruel Jewel 106M 2023 (48 hours) |
| 114641 | Keck | Ashton | F | Sd | US | 1 | Bighorn 100M 2023 (35 hours) |
| 115318 | Keck | Marietta | F | Bavaria | US | 1 | Zugspitz 111km 2023 (25 hours) |
| 113846 | Ked | Jon | M | CO | US | 2 | Tarawera 100K 102km 2023 (17 hours) |
| 102395 | Keddie | Emily | F | OR | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 115978 | Keel | Dylan | M | CA | US | 1 | Pine to Palm 100M 2023 (34 hours) |
| 100272 | Keele | Bruce | M | NJ | US | 64 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 118978 | Keeling | Ryan | M | WA | US | 1 | Cascade Crest 100M 2023 (35 hours) |
| 111981 | Keenan | Nick | M | WA | US | 2 | Gorge Waterfalls 100km 2023 (17 hours) |
| 117776 | Keeter | Emily | F | TN | US | 1 | Patagonia 112km 2023 (27 hours) |
| 111908 | Keffer | Philip | M | Vermont | US | 2 | Wasatch Front 100M 2023 (36 hours) |
| 106467 | Kegan | Amelia | F | MD | US | 2 | Massanutten 100M 2023 (36 hours) |
| 117500 | kehe | michael | M | Oregon | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 114955 | Kehoe | Dylan | M | CW | IE | 1 | Kerry Way Ultra 101km 2023 (20 hours) |
| 119123 | Kehrberg | Steven | M | Baden-Wuerttemberg | US | 1 | Zugspitz 111km 2023 (25 hours) |
| 115986 | Keiser | Richard | M | California | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 103064 | Keith | Eoin | M | IRL | IE | 8 | Ultra-Trail Snowdonia by UTMB 165km 2023 (50 hours) |
| 108800 | Kelch | Ted | M | Georgia | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 115951 | Kellam | Alex | M | Colorado | US | 1 | Never Summer 103km 2023 (23 hours) |
| 110959 | Keller | Clinton | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 107552 | Keller | Colin | M | CA | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 104563 | Keller | James | M | NV | US | 1 | Western States 100M 2023 (30 hours) |
| 102658 | Kelley | Dan | M | MA | US | 1 | Western States 100M 2023 (30 hours) |
| 106880 | Kelley | Jim | M | WI | US | 16 | Indiana 100M 2023 (30 hours) |
| 100998 | Kelley | Rachel | F | NC | US | 4 | Hardrock 100M 2023 (48 hours) |
| 117646 | Kelling | David | M | CA | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 116023 | Kelly | Alexander | M | UT | US | 1 | Bear, The 100M 2023 (36 hours) |
| 113123 | Kelly | Andrew | M | England | GB | 1 | South Downs Way 100M 2023 (30 hours) |
| 112407 | Kelly | Conan | M | CA | US | 2 | Run Rabbit Run 100M 2023 (36 hours) |
| 100763 | Kelly | Devin | M | MT | US | 2 | Crazy Mountain 100M 2023 (36 hours) |
| 111855 | Kelly | Elizabeth | F | MO | US | 2 | Cocodona 250M 2023 (125 hours) |
| 113821 | Kelly | Erin | F | MN | US | 2 | Canyons by UTMB 100M 2023 (32 hours) |
| 118615 | KELLY | GENE | M | TX | US | 1 | Burning River 100M 2023 (30 hours) |
| 101150 | Kelly | John | M | NC | US | 16 | HOKA Bandera 100km 2023 (17 hours) |
| 104717 | Kelly | Neil | M | NY | US | 8 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 116288 | Kelly | Ron | M | WA | US | 1 | Gorge Waterfalls 100km 2023 (17 hours) |
| 109607 | Kelly-Daum | Michelle | F | OH | US | 4 | Rim to River 100M 2023 (32 hours) |
| 104008 | Kelman | Erin | M | MD | US | 64 | Hellgate 100km 2022 (17 hours) |
| 112693 | Kelsey | Rob | M | IL | US | 2 | Indiana 100M 2023 (30 hours) |
| 112590 | Kelty | Beth | F | Oregon | US | 2 | Mountain Lakes 100M 2023 (30 hours) |
| 108957 | Kemmeren | Matthias | M | IL | US | 4 | Leadville Trail 100M 2023 (30 hours) |
| 117539 | Kemp | Angie | F | AZ | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 111529 | Kempton | Neil | M | North Somerset | GB | 2 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 103329 | Kendra | Victoria | F | NC | US | 4 | No Business 100M 2023 (33.5 hours) |
| 102565 | Kenkre | Baban | M | CA | US | 64 | Quicksilver 100km 2023 (17 hours) |
| 112818 | Kennedy | Brett | M | South Australia | AU | 2 | Kosciusko by UTMB 100km 2022 (18 hours) |
| 116465 | Kennedy | Cian | M | Cork | IE | 1 | South Downs Way 100M 2023 (30 hours) |
| 111412 | Kennedy | David | M | Pennsylvania | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 114393 | Kennedy | Eric | M | PA | US | 2 | Laurel Highlands 70.5M 2023 (20 hours) |
| 116395 | Kennedy | Kelly | M | Pennsylvania | US | 1 | Eastern States 100M 2023 (36 hours) |
| 102228 | Kennedy | Trena | F | GA | US | 64 | Indiana 100M 2023 (30 hours) |
| 110811 | Kennemer | Erik | M | TX | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 107735 | Kenney | Sean | M | NE | US | 4 | Yeti (Virginia) 100M 2023 (30 hours) |
| 107548 | Kenny | Charissa | F | Colorado | US | 4 | Javelina Jundred 100M 2023 (30 hours) |
| 100524 | Kent | Craig | M | OH | US | 64 | Gorge Waterfalls 100km 2023 (17 hours) |
| 110971 | Kent | Justin | M | Washington | US | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116878 | Kent | Victoria | F | ID | US | 1 | IMTUF 100M 2023 (36 hours) |
| 118464 | Kent | William | M | OK | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 100144 | Kenty | Jennifer | F | MA | US | 1 | Western States 100M 2023 (30 hours) |
| 115200 | Kenyon | Claire | F | Auckland | NZ | 1 | Taupo 100k 100km 2023 (17 hours) |
| 116248 | Keran | Carrie | F | MO | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 112057 | Kerezman | Benjamin | M | IN | US | 2 | Indiana 100M 2023 (30 hours) |
| 115018 | Kern | Jeff | M | SC | US | 1 | No Business 100M 2023 (33.5 hours) |
| 117784 | Kern | Joe | M | In | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 117993 | Kernohan | Brad | M | Ontario | CA | 1 | Puerto Vallarta México by UTMB 100km 2023 (18 hours) |
| 109760 | Kerr | Aaron | M | Northumberland | GB | 4 | Lakeland 100M 2023 (40 hours) |
| 115220 | Kerr-Taylor | Anthony | M | Auckland | NZ | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 117517 | Kershaw | Alice | F | Yorkshire | GB | 1 | Hardwolds 80M 2022 (24 hours) |
| 106883 | Kershen | Michael | M | CO | US | 16 | Cocodona 250M 2023 (125 hours) |
| 111603 | Kervarec | Sebastien | M | Zurich | CH | 2 | Wildstrubel by UTMB 108km 2023 (26 hours) |
| 100465 | Kesterson | Dave | M | TN | US | 4 | No Business 100M 2023 (33.5 hours) |
| 114436 | Key | Richard | M | Virginia | US | 2 | Hellgate 100km 2022 (17 hours) |
| 117455 | Keyes | Marty | M | NSW | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 109854 | Keyton | Natalie | F | MI | US | 2 | Hallucination (Run Woodstock) 100M 2023 (30 hours) |
| 117687 | Khachatooryan | Aramik | M | California | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 108352 | Khadka | Sworupa | F | NY | US | 4 | Cascade Crest 100M 2023 (35 hours) |
| 118173 | Khalpe | Mohamed | M | Western Cape | ZA | 1 | Ultra-Trail Cape Town 100M 2022 (45 hours) |
| 116310 | Khatchatoorian | Bridget | F | VA | US | 1 | Miwok 100km 2023 (15.5 hours) |
| 115268 | Khaw | Zhan Wei | M | Singapore | SG | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116185 | Khitrykau | Dzmitry | M | Colorado | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 112210 | Kibit | Henry | M | OR | US | 2 | Cascade Crest 100M 2023 (35 hours) |
| 110699 | Kibreab | Elias | M | ON | CA | 1 | Quebec Mega Trail 100M 2023 (40 hours) |
| 106422 | Kidd | Matt | M | AB | CA | 4 | La Sportiva Arc of Attrition 100M 2023 (36 hours) |
| 104706 | Kiddle | Matthew | M | GBR | GB | 32 | Lakeland 100M 2023 (40 hours) |
| 103681 | Kido | Kensuke | M | JPN | JP | 4 | Transjeju International Trail Run 112km 2023 (27 hours) |
| 101201 | Kienle | Eric | M | MT | US | 4 | Georgia Death Race 74M 2023 (23 hours) |
| 103700 | Kiernan | Sigurdur | M | ISL | IS | 4 | Lavaredo Ultra Trail by UTMB 120km 2023 (26 hours) |
| 116097 | Kiewiet | Ross | M | AZ | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 112297 | Kiewiet | Ryan | M | Arizona | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 106054 | Kikushima | Kei | M | JPN | JP | 4 | Okushinano 100km 2023 (21 hours) |
| 102117 | Kilbury | Tyler | M | MN | US | 16 | Sean O'Brien 100km 2023 (16 hours) |
| 101845 | Kilgore | Daniel | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 107388 | Kilgore | Jake | M | UT | US | 2 | Miwok 100km 2023 (15.5 hours) |
| 116111 | Kilgore | Nate | M | Ohio | US | 1 | Grindstone 100M 2023 (38 hours) |
| 117917 | Killesteyn | Kristy | F | NSW | AU | 1 | Kosciusko by UTMB 100km 2022 (18 hours) |
| 119096 | Killo | Jason | M | PA | US | 1 | Worlds End 100km 2023 (19 hours) |
| 111532 | Kilner | Mark | M | Yorkshire | GB | 2 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 116165 | Kim | Andrew | M | CA | US | 1 | Sean O'Brien 100km 2023 (16 hours) |
| 118336 | KIM | BONGJAE | M | Gyeongsangnam-do | KR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104264 | Kim | Dujin | F | WA | US | 16 | Cascade Crest 100M 2023 (35 hours) |
| 118440 | KIM | HEENAM | M | SEOUL | KR | 1 | Ultra-Trail Mt Fuji 100M 2023 (45 hours) |
| 100168 | Kim | Hohyun | M | CA | US | 8 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 118999 | Kim | Insung | F | MD | US | 1 | Umstead 100M 2023 (30 hours) |
| 116497 | Kim | Jung | F | IL | US | 1 | Kettle Moraine 100M 2023 (30 hours) |
| 118331 | Kim | Moon Hwan | M | Seoul | KR | 1 | Doi Inthanon Thailand by UTMB 100M 2022 (48 hours) |
| 104235 | Kim | SunDuk | F | CA | US | 8 | Javelina Jundred 100M 2023 (30 hours) |
| 116890 | kimball | nikki | F | MT | US | 1 | IMTUF 100M 2023 (36 hours) |
| 103383 | Kimber | Evan | M | CO | US | 8 | Hardrock 100M 2023 (48 hours) |
| 101644 | Kimble | Adam | M | CA | US | 2 | Canyons by UTMB 100M 2023 (32 hours) |
| 118341 | Kimmel | Joanna | F | VA | US | 1 | Grindstone 100M 2023 (38 hours) |
| 115990 | Kimmel | Silvio | M | Nordrhein-Westfalen | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 118514 | Kindelbacher | Bernhard | M | Hesse | DE | 1 | Zugspitz 111km 2023 (25 hours) |
| 108339 | King | Brian | M | AZ | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 111303 | King | David | M | Victoria | AU | 2 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 103225 | King | Emanuel | M | PA | US | 4 | Massanutten 100M 2023 (36 hours) |
| 107489 | King | Jamie | F | OR | US | 4 | Cascade Crest 100M 2023 (35 hours) |
| 116654 | King | Jeremey | M | NM | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 113137 | King | Josh | M | AB | CA | 2 | Canadian Death Race 125km 2023 (24 hours) |
| 101189 | King | Lamont | M | CA | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 115943 | King | Lisa | F | MI | US | 1 | Hennepin 100M 2023 (30 hours) |
| 110347 | King | Mosi | M | OR | US | 4 | Bigfoot 206M 2023 (100 hours) |
| 115408 | King | Nathan | M | AZ | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 109830 | KING | Ryan | M | Nevada | US | 4 | Oregon Cascades 100M 2023 (32:01:18) |
| 115432 | King | Stan | M | GA | US | 1 | No Business 100M 2023 (33.5 hours) |
| 119063 | Kingsbury | Trever | M | Alaska | US | 1 | Kodiak Ultra Marathons by UTMB 100km 2023 (18 hours) |
| 106262 | Kingston | Noel | M | AZ | US | 8 | Black Canyon 100km 2023 (17 hours) |
| 105634 | Kingston | Patrick | M | GBR | GB | 16 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 110611 | Kinner | Jon | M | CO | US | 2 | Bighorn 100M 2023 (35 hours) |
| 102437 | Kinner | Justin | M | WY | US | 4 | Bighorn 100M 2023 (35 hours) |
| 108773 | Kinney | Matt | M | California | US | 4 | Zion 100km 2023 (19 hours) |
| 118218 | Kinsey | David | M | North Carolina | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 117666 | Kinsley | Thomas | M | QLD | AU | 1 | Blackall 100K 100km 2023 (18 hours) |
| 114339 | Kipps | Walter | M | VA | US | 2 | Hellgate 100km 2022 (17 hours) |
| 117212 | Kirby | John | M | MT | US | 1 | Beaverhead 100km 2023 (20 hours) |
| 111385 | Kirby | Kathryn | F | CA | US | 2 | Miwok 100km 2023 (15.5 hours) |
| 116414 | Kirby | Steve | M | Ohio | US | 1 | Mohican 100M 2023 (32 hours) |
| 101064 | Kirk | Jenni | F | GA | US | 128 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 118839 | Kirk | Matthew | M | WA | US | 1 | IMTUF 100M 2023 (36 hours) |
| 112239 | Kirk | Samuel | M | PA | US | 2 | Black Canyon 100km 2023 (17 hours) |
| 119083 | Kirkeby | Jordan | M | Alberta | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 118372 | Kirkes | Toni | F | TX | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 113750 | KIRKLAND | MARK | M | IL | US | 2 | Bear, The 100M 2023 (36 hours) |
| 114154 | Kirkman | Derek | M | FL | US | 2 | Long Haul 100M 2023 (30 hours) |
| 115417 | Kirsch | Kenneth | M | New Jersey | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 117711 | Kirwan | Malachy | M | Singapore | SG | 1 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 110316 | Kish | William | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 103577 | Kiso | Tetsuo | M | JPN | JP | 16 | Canyons by UTMB 100M 2023 (32 hours) |
| 110065 | Kitano | Masahiro | M | CA | US | 4 | Mountain Lakes 100M 2023 (30 hours) |
| 106644 | Kitano | Shuntaro | M | JPN | JP | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116373 | Kitching | Luke | M | Alberta | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 108104 | Kivi | Josh | M | Nevada | US | 4 | Tahoe Rim Trail 100M 2023 (36 hours) |
| 111112 | Kjartansdottir | Andrea | F | Reykjavik | IS | 2 | Thames Path 100 100M 2023 (28 hours) |
| 113234 | Kjellberg | Marcus | M | Halland | SE | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 116219 | Kjerengtroen | Lars | M | Utah | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 110336 | Kjøllmoen Steien | Aasmund | M | Innlandet | NO | 2 | Istria by UTMB 110km 2023 (24 hours) |
| 112038 | Klassen | Lindsey | F | CA | US | 2 | Canyons by UTMB 100km 2023 (18 hours) |
| 108106 | Klatt | Amanda | F | Utah | US | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 112443 | Klatt | Denise | F | NI | DE | 2 | Canyons by UTMB 100M 2023 (32 hours) |
| 109667 | Klaustermeier | Jake | M | IL | US | 2 | Indiana 100M 2023 (30 hours) |
| 116918 | Klawitter | Karsten | M | BC | CA | 1 | Ultra-Trail Harricana 125km 2023 (26 hours) |
| 108316 | Klayko | Christina | F | CA | US | 4 | Quicksilver 100km 2023 (17 hours) |
| 119025 | Kleemeier | Doug | M | MN | US | 1 | Superior 100 100M 2023 (38 hours) |
| 117862 | Klein | Adam | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 103406 | Klein | Gary | M | CA | US | 2 | Courmayeur Champex Chamonix (CCC) 100km 2023 (25 hours) |
| 118356 | Klein | Michael | M | Montana | US | 1 | Crazy Mountain 100M 2023 (36 hours) |
| 109676 | Klein | Michael | M | UT | US | 4 | Georgia Death Race 74M 2023 (23 hours) |
| 117865 | Klein | Travis | M | AZ | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 111831 | Kleine-Fournier | Tristan | M | Quebec | CA | 2 | Quebec Mega Trail 100M 2023 (40 hours) |
| 105302 | Kleinke | Andrew | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 105494 | Kleinman | Aaron | M | CA | US | 4 | Wasatch Front 100M 2023 (36 hours) |
| 100285 | Kleist | Todd | M | IL | US | 4 | Quicksilver 100km 2023 (17 hours) |
| 116116 | Klemens | Irene | F | Colorado | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 115662 | Kleparek | David | M | KY | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 104464 | Klettlinger | Mark | M | OH | US | 32 | Burning River 100M 2023 (30 hours) |
| 116700 | Klimek | Marci | F | Montana | US | 1 | Waldo 100km 2023 (18 hours) |
| 109738 | Klimowicz | Brittany | U | NY | US | 2 | Hardrock 100M 2023 (48 hours) |
| 116587 | Kline | Brent | M | CA | US | 1 | Leadville Trail 100M 2023 (30 hours) |
| 113243 | Kline | Jon | M | California | US | 2 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 115481 | Klinger | Ryan | M | VA | US | 1 | Grindstone 100M 2023 (38 hours) |
| 114951 | Klingman | Alana | F | CA | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 116694 | Klingsporn | Montana | M | FL - FLORIDA | US | 1 | Grindstone 100km 2023 (18 hours) |
| 101014 | Klink | Kristen | F | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 118193 | Klink | Tony | M | Ca | US | 1 | Rio Del Lago 100M 2023 (30 hours) |
| 116283 | Klinker | Jake | M | CO | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 103521 | Kluckow | Simon | M | AUS | AU | 2 | Tarawera 100M 100M 2023 (36 hours) |
| 101766 | Klug | Brian | M | MN | US | 1 | Western States 100M 2023 (30 hours) |
| 116659 | Kluge | Andrew | M | Ohio | US | 1 | Canal Corridor 100 100M 2023 (30 hours) |
| 112886 | Klus | Marek | M | Slovakia | SK | 2 | Letecka Stovka 104km 2023 (22 hours) |
| 100027 | Kluttz | Jeremy | M | TN | US | 8 | Zion 100km 2023 (19 hours) |
| 113272 | Knabe | Zachery | M | WA | US | 2 | Cascade Crest 100M 2023 (35 hours) |
| 118969 | Knafelj | Tajda | F | Gorenjska | US | 1 | Julian Alps Trail Run by UTMB 106km 2023 (24 hours) |
| 113102 | Knaus | Jeremy | M | WI | US | 2 | Hennepin 100M 2023 (30 hours) |
| 119105 | Kneale | Caspar | M | Wellington | NZ | 1 | Tarawera 100K 102km 2023 (17 hours) |
| 101614 | Knezevich | Lindsay | F | BC | CA | 2 | Fat Dog 120M 2023 (48 hours) |
| 112805 | KNIGHT | DARYL | M | CA | US | 2 | Mountain Lakes 100M 2023 (30 hours) |
| 101906 | Knight | Don | M | PA | US | 16 | Miwok 100km 2023 (15.5 hours) |
| 116535 | Knights | Charlie | M | Glos | GB | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 107655 | Knoche | Michael | M | Bayern | DE | 4 | Zugspitz 111km 2023 (25 hours) |
| 115131 | Knoeferl | Keri | F | NC | US | 1 | Grindstone 100km 2023 (18 hours) |
| 114031 | Knopp | Kelly | F | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 119139 | Knoth | William | M | Indiana | US | 1 | Indiana 100M 2023 (30 hours) |
| 117347 | Knowles | Justin | M | British Columbia | CA | 1 | Fat Dog 120M 2023 (48 hours) |
| 116059 | Knox | Steve | M | FL | US | 1 | Georgia Death Race 74M 2023 (23 hours) |
| 110439 | Knüsel | Leona | F | Luzern | CH | 2 | Swiss Alps 100km 2023 (22 hours) |
| 108964 | Knüsel | Liliane | F | Zurich | CH | 2 | Swiss Alps 100km 2023 (22 hours) |
| 116450 | Knutson | Adam | M | Oklahoma | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 115186 | Ko-Tang | Amy | F | NJ | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 117822 | KOBA | Hironobu | M | Hokkaido | JP | 1 | Shinetsu Five Mountains Trail 100M 2023 (33 hours) |
| 118392 | Kobayashi | Eriko | F | 茨城県 | JP | 1 | Shinetsu Five Mountains Trail 100M 2023 (33 hours) |
| 118896 | Kobayashi | Masanao | M | TX | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 114332 | Koca | Joseph | M | NC | US | 2 | Georgia Death Race 74M 2023 (23 hours) |
| 118701 | Kocken | William | M | WI | US | 1 | Run Rabbit Run 100M 2023 (36 hours) |
| 112280 | Kodaira | Masakazu | M | Tokyo | JP | 2 | OSJ Ontake 100km 2023 (16 hours) |
| 118882 | Kodovsky | Jan | M | Rhode Island | US | 1 | Massanutten 100M 2023 (36 hours) |
| 107718 | Koehler | Andrew | M | CA | US | 4 | Gorge Waterfalls 100km 2023 (17 hours) |
| 100376 | Koelli | Wolfgang | M | AUT | AT | 2 | Tuscany Crossing 103km 2023 (21 hours) |
| 112019 | Koenig | Erik | M | California | US | 2 | HURT 100M 2023 (36 hours) |
| 112679 | Koenig | John | M | Indiana | US | 2 | No Business 100M 2023 (33.5 hours) |
| 118036 | Koffel | Greg | M | MD | US | 1 | Rim to River 100M 2023 (32 hours) |
| 113323 | Koga | Tsubasa | M | Kanagawa | JP | 2 | Shinetsu Five Mountains Trail 100M 2023 (33 hours) |
| 110066 | Koh | Alec | M | Oregon | US | 4 | Gorge Waterfalls 100km 2023 (17 hours) |
| 104505 | Kohler | John | M | KS | US | 8 | Tunnel Hill 100M 2022 (30 hours) |
| 102360 | Kohlhund | Andreas | M | DEU | DE | 32 | Zugspitz 111km 2023 (25 hours) |
| 118723 | Kohm | Cory | M | Montana | US | 1 | Black Canyon 100km 2023 (17 hours) |
| 105336 | Kohout | Piera | F | AUS | AU | 16 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 104393 | Kohsaka | Yasushi | M | JPN | JP | 4 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 105776 | Kojala | Donatas | M | LTU | LT | 8 | Javornicka 105km 2023 (24 hours) |
| 113459 | Kolasinski | Larissa | F | WA | US | 2 | Cuyamaca 100km 2023 (17 hours) |
| 108233 | Kolb | Adam | M | PA | US | 4 | Worlds End 100km 2023 (19 hours) |
| 115359 | kolek | will | M | NY | US | 1 | Canal Corridor 100 100M 2023 (30 hours) |
| 112036 | Kolh | John | M | New York | US | 2 | Twisted Branch 100km 2023 (20 hours) |
| 117834 | komine | hisashi | M | tokyo | JP | 1 | Shinetsu Five Mountains Trail 100M 2023 (33 hours) |
| 113288 | Konczak | Franz | M | TX | US | 2 | HOKA Bandera 100km 2023 (17 hours) |
| 118871 | Kondo | Dai | M | Barcelona | ES | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 104543 | Kondo | Sarah | F | ON | CA | 8 | Gorge Waterfalls 100km 2023 (17 hours) |
| 116215 | KONDUR NAGABHUSHAN | NARESHKUMAR | M | MISSOURI | US | 1 | Tunnel Hill 100M 2022 (30 hours) |
| 117241 | Konečný | Ondřej | M | Czech Republic | CZ | 1 | Letecka Stovka 104km 2023 (22 hours) |
| 117527 | Kong | Alexandra | F | NSW | AU | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 110499 | Kongsted | Hans Christian | M | Capital region | DK | 2 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 111539 | Konkol | Timo | M | Baden-Württemberg | DE | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 102901 | Kono | Daniel | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 108807 | Konowitch | Sam | M | Nevada | US | 4 | Leadville Trail 100M 2023 (30 hours) |
| 103446 | Konvalin | Brent | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 115540 | Kool | Steven | M | CA | US | 1 | Quicksilver 100km 2023 (17 hours) |
| 110070 | Koopmans | Carl | M | WA | US | 4 | Cascade Crest 100M 2023 (35 hours) |
| 117963 | Kopczenski | Kendra | F | Md | US | 1 | Rim to River 100M 2023 (32 hours) |
| 108532 | Kopczynski | Bartosz | M | Uusimaa | FI | 4 | Istria by UTMB 110km 2023 (24 hours) |
| 111242 | Kopelov | Labe | M | Indiana | US | 2 | No Business 100M 2023 (33.5 hours) |
| 114327 | Kopelwitz | Jessica | F | OH | US | 2 | Burning River 100M 2023 (30 hours) |
| 112351 | Kopf | Maximilian | M | Upper Austria | AT | 2 | Istria by UTMB 168km 2023 (46 hours) |
| 101825 | Koppany | Adam | M | ON | CA | 8 | Twisted Branch 100km 2023 (20 hours) |
| 114739 | Koppert | Mackenzie | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 102856 | Koppy | Michael | M | MN | US | 128 | Burning River 100M 2023 (30 hours) |
| 116684 | Korb | Dionatan | M | SC | BR | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 117661 | Kordie | Matt | M | Michigan | US | 1 | Grindstone 100M 2023 (38 hours) |
| 115526 | Korecki | Andrzej | M | Kujawsko-Pomorskie | PL | 1 | TDS (Sur les Traces des Ducs de Savoie) 147km 2023 (45 hours) |
| 112705 | Kornegay | Matt | M | NC | US | 2 | Georgia Death Race 74M 2023 (23 hours) |
| 102800 | Kornhaus | Steven | M | CO | US | 8 | No Business 100M 2023 (33.5 hours) |
| 116863 | Koroi | Penelope | F | South Island | NZ | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 117645 | korry | andrea | F | WA | US | 1 | Oregon Cascades 100M 2023 (32:01:18) |
| 117686 | Kortum | Alex | M | BC | CA | 1 | Black Canyon 100km 2023 (17 hours) |
| 108405 | Kosbie | Jeffrey | M | California | US | 4 | Miwok 100km 2023 (15.5 hours) |
| 100620 | Kosek | Eric | M | PA | US | 2 | Crazy Mountain 100M 2023 (36 hours) |
| 100733 | Kosek | Rebecca | F | PA | US | 4 | Crazy Mountain 100M 2023 (36 hours) |
| 104378 | Koshii | Daishi | M | JPN | JP | 8 | HURT 100M 2023 (36 hours) |
| 115459 | Kosieradzki | Lukasz | M | Malopolskie | PL | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 101786 | Kosova | Anna | F | CA | US | 32 | Sean O'Brien 100km 2023 (16 hours) |
| 101662 | Kosut | Lukas | M | CZE | CZ | 4 | Ultra Trail Vipava Valley 106km 2023 (25 hours) |
| 118229 | Kotai | Victor | M | London | GB | 1 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 109944 | Kotz | Jason | M | PA | US | 4 | Kettle Moraine 100M 2023 (30 hours) |
| 114616 | Koudelka | Carl | M | VIC | AU | 1 | Tarawera 100M 100M 2023 (36 hours) |
| 117391 | KOUGIOUMTZIS | GEORGIOS | M | Central Macedonia | GR | 1 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 119159 | Kovach | Joe | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 111366 | Kovach | Marissa | F | Pennsylvania | US | 2 | Eastern States 100M 2023 (36 hours) |
| 115401 | Kowalczyk | Ronald | M | Fl | US | 1 | Canyons by UTMB 100M 2023 (32 hours) |
| 105957 | Kowalik | Andrzej | M | POL | PL | 64 | Olympus Mythical Trail 110km 2023 (28 hours) |
| 118930 | Kowalkiewicz | Marek | M | Queensland | AU | 1 | Ultra-Trail Australia by UTMB 100km 2023 (19 hours) |
| 112946 | Kowalkowski | Krzysztof | M | PL | PL | 2 | Kierat 100km 2023 (27 hours) |
| 110230 | Kowalski | Alex | M | CA | US | 4 | Zion 100M 2023 (36 hours) |
| 115396 | Kowalski | Dan | M | MT | US | 1 | Bighorn 100M 2023 (35 hours) |
| 115034 | Koza | Casey | M | Ohio | US | 1 | Grindstone 100km 2023 (18 hours) |
| 106023 | Kozak | Jeff | M | CA | US | 1 | Western States 100M 2023 (30 hours) |
| 111038 | Kozlowski | Harrison | M | California | US | 1 | Cuyamaca 100km 2023 (17 hours) |
| 118041 | Kraeft | Kyle | M | FL | US | 1 | Pinhoti 100M 2023 (31 hours) |
| 119012 | Kraemer | Florian Jonas | M | Berlin | DE | 1 | Grossglockner UltraTrail 110km 2023 (28 hours) |
| 101626 | Kragtorp | Wade | M | MN | US | 8 | Superior 100 100M 2023 (38 hours) |
| 111788 | Krähenbühl | Samuel | M | Zug | CH | 2 | Ultra-Trail Du Mont-Blanc (UTMB) 100M 2023 (46:30) |
| 103649 | Krajcar | Zelko | M | SWE | SE | 16 | Kullamannen by UTMB 100M 2023 (34 hours) |
| 106499 | Krajna | Tom | M | AL | US | 8 | Tunnel Hill 100M 2022 (30 hours) |
| 118584 | Kralj | Heather | F | TN | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 111122 | Kramer | Ryan | M | Ohio | US | 2 | Grindstone 100km 2023 (18 hours) |
| 115689 | Kramer | Ryan | M | IA | US | 1 | Javelina Jundred 100M 2023 (30 hours) |
| 118067 | Krammer | Christian | M | Burgenland | AT | 1 | Brazil 135 135M 2023 (120 hours) |
| 111429 | Krantz | Molly | F | OR | US | 2 | Mountain Lakes 100M 2023 (30 hours) |
| 110483 | Krantz | Rita | F | OR | US | 4 | Black Canyon 100km 2023 (17 hours) |
| 104313 | Kranz | Jill | F | WA | US | 2 | Javelina Jundred 100M 2023 (30 hours) |
| 102336 | Kratky | John | M | NC | US | 16 | Yeti (Virginia) 100M 2023 (30 hours) |
| 118688 | Kratzer | Marshall | M | Texas | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 116541 | Kraus | Benjamin | M | NRW | DE | 1 | Grand Trail des Lacs et Châteaux 165km 2023 (40 hours) |
| 110047 | Kraus | Joshua | M | CA | US | 4 | San Diego 100M 2023 (32 hours) |
| 108393 | Kraus | Zachary | M | IL | US | 4 | Kodiak Ultra Marathons by UTMB 100M 2023 (36 hours) |
| 116728 | Krause | Benjamin | M | OR | US | 1 | Waldo 100km 2023 (18 hours) |
| 117665 | Krause | John | M | Va | US | 1 | Yeti (Virginia) 100M 2023 (30 hours) |
| 104321 | Krause | Mark | M | IL | US | 4 | Hennepin 100M 2023 (30 hours) |
| 105455 | Kravetz | Lisa | F | AZ | US | 64 | Cuyamaca 100km 2023 (17 hours) |
| 113631 | Kreeger | Nathan | M | NC | US | 2 | Umstead 100M 2023 (30 hours) |
| 108212 | Kremer | Ken | M | Pennsylvania | US | 4 | Worlds End 100km 2023 (19 hours) |
| 116255 | Krempa | Slawomir | M | mazowieckie | PL | 1 | Nuts Ylläs Pallas 160km 2023 (36 hours) |
| 118476 | Krepelka | Jonas | N | Vaud | CH | 1 | Ultra-Trail Snowdonia by UTMB 165km 2023 (50 hours) |
| 110782 | Krepsik | Matthew | M | IL | US | 4 | Hennepin 100M 2023 (30 hours) |
| 111158 | Kresky-Griffin | Lisa | F | MN | US | 2 | Leadville Trail 100M 2023 (30 hours) |
| 112044 | Kretlow | Jacob | M | Georgia | US | 2 | Cruel Jewel 106M 2023 (48 hours) |
| 116057 | Kreutz | Caitlyn | F | NY | US | 1 | Grindstone 100km 2023 (18 hours) |
| 116642 | Kriakov | Ivan | M | Colorado | US | 1 | Canyons by UTMB 100km 2023 (18 hours) |
| 116273 | Kriegel | Kyle | M | TX | US | 1 | Waldo 100km 2023 (18 hours) |
| 118948 | Kristiansen | Torstein | M | Arendal | US | 1 | Salomon Xreid Trollheimen 120km 2023 (35 hours) |
| 112910 | Kristoffersen | Maibritt | F | Ø | DK | 2 | Mozart 100 by UTMB 108km 2023 (22 hours) |
| 114126 | Krkic | Predrag | M | IL | US | 2 | Tunnel Hill 100M 2022 (30 hours) |
| 117664 | Kroger | Chris | M | CA | US | 1 | Lake Sonoma 100K 100km 2023 (18 hours) |
| 104211 | Krogsrud | Ken | M | CA | US | 16 | Sean O'Brien 100km 2023 (16 hours) |
| 108960 | Krogsrud | Shannon | F | California | US | 4 | Sean O'Brien 100km 2023 (16 hours) |
| 116509 | Kroll | Danny | M | Alberta | CA | 1 | Canadian Death Race 125km 2023 (24 hours) |
| 111817 | KROMMENACKER | DAVID | M | FRANCE | FR | 2 | Les Coursières des Hauts du Lyonnais 111km 2023 (22 hours) |
| 115895 | kronable | mary | F | MO | US | 1 | Hennepin 100M 2023 (30 hours) |
| 117941 | Krong | Jake | M | UT | US | 1 | Bear, The 100M 2023 (36 hours) |
| 117201 | Kroning | Kayla | F | MI | US | 1 | HOKA Bandera 100km 2023 (17 hours) |
| 102383 | Kropf | Pamela | F | CA | US | 32 | Rio Del Lago 100M 2023 (30 hours) |
| 116859 | Kropf | Terrell | M | Arkansas | US | 1 | Arkansas Traveler 100M 2023 (30 hours) |
| 112416 | Kroupa | Tomas | M | Czech Republic | CZ | 2 | Krakonosova Stovka 100km 2023 (22 hours) |
| 112787 | Kruger | Damon | M | WA | US | 2 | Mountain Lakes 100M 2023 (30 hours) |
| 116591 | Krumfuss | Jan</ |