| Fighter | Record | Last Bout |
|---|---|---|
| AJ Dobson | 7-3-0 (1 NC) | 2024-03-23 |
| Aisling Daly | 16-6-0 | 2015-10-24 |
| Albert Duraev | 16-5-0 | 2023-07-15 |
| Alessio Di Chirico | 13-7-0 | 2022-09-03 |
| Alex Da Silva | 21-4-0 | 2022-06-04 |
| Alexandre Dantas | 0-3-0 | 2003-02-28 |
| Alexis Davis | 21-11-0 | 2022-02-05 |
| Alexis Dufresne | 6-3-0 | 2015-01-03 |
| Anderson Dos Santos | 21-9-0 | 2021-08-07 |
| Ante Delija | 26-8-0 | 2026-02-21 |
| Antonio Dos Santos | 6-4-0 | 2015-06-20 |
| Ariane da Silva | 17-11-0 | 2025-06-07 |
| Batgerel Danaa | 12-5-0 | 2023-04-22 |
| Beneil Dariush | 23-8-1 | 2026-05-02 |
| Benoit Saint Denis | 17-4-0 (1 NC) | 2026-07-11 |
| Blood Diamond | 3-3-0 | 2023-09-09 |
| Brandon Davis | 14-10-0 | 2022-10-15 |
| CB Dollaway | 17-9-0 | 2018-09-15 |
| Cameron Dollar | 11-5-0 | 2009-06-20 |
| Carl Deaton | 17-7-0 (2 NC) | 2023-07-15 |
| Carls John De Tomas | 6-2-0 | 2017-12-09 |
| Chris Daukaus | 12-7-0 | 2023-08-12 |
| Chris Dempsey | 11-5-0 | 2016-02-27 |
| Chris Duncan | 15-3-0 | 2026-04-04 |
| Chris de la Rocha | 5-3-0 | 2018-12-15 |
| Christian Leroy Duncan | 15-2-0 | 2026-10-10 |
| Cindy Dandois | 8-3-0 | 2017-04-22 |
| Cody Donovan | 8-5-0 | 2014-07-19 |
| Cody Durden | 18-11-1 | 2026-07-11 |
| Cyrille Diabate | 19-10-1 | 2014-03-08 |
| Da Woon Jung | 15-6-1 | 2024-09-28 |
| Da'Mon Blackshear | 17-8-1 | 2025-07-26 |
| DaMarques Johnson | 15-15-0 | 2012-09-29 |
| Daichi Abe | 6-2-0 | 2018-06-23 |
| Daiju Takase | 12-15-2 | 2000-12-16 |
| Dakota Bush | 8-4-0 | 2022-01-15 |
| Dakota Hope | 11-2-0 | 2026-04-04 |
| Dalcha Lungiambula | 11-6-0 | 2022-12-10 |
| Dale Hartt | 6-3-0 | 2009-06-13 |
| Damacio Page | 19-10-0 | 2012-07-11 |
| Damian Grabowski | 20-5-0 | 2017-07-22 |
| Damian Pinas | 10-1-0 | 2026-10-03 |
| Damian Rzepecki | 10-1-0 | 2026-07-25 |
| Damian Stasiak | 10-6-0 | 2018-07-22 |
| Damien Anderson | 5-1-0 | 2026-07-18 |
| Damien Brown | 17-12-0 | 2018-02-10 |
| Damir Hadzovic | 14-8-0 | 2025-02-01 |
| Damir Ismagulov | 24-3-0 | 2023-07-01 |
| Damon Jackson | 23-8-1 (1 NC) | 2024-11-16 |
| Dan Argueta | 9-3-0 (2 NC) | 2024-10-12 |