| Fighter | Record | Last Bout |
|---|---|---|
| Don Shainis | 12-5-0 | 2023-02-11 |
| Donald Cerrone | 36-17-0 (2 NC) | 2022-07-02 |
| Dong Hyun Kim | 22-4-1 (1 NC) | 2017-06-17 |
| Dong Hyun Ma | 16-11-3 | 2019-12-21 |
| Dongi Yang | 13-3-0 | 2015-11-28 |
| Donnie Chappell | 0-1-0 | 1997-07-27 |
| Donny Walker | 15-10-0 | 2011-09-17 |
| Dorian Price | 8-5-0 | 2007-12-08 |
| Doug Evans | 13-10-0 | 2007-12-29 |
| Drako Rodriguez | 7-3-0 | 2021-08-07 |
| Drew Fickett | 42-21-0 | 2007-04-05 |
| Drew McFedries | 12-7-0 | 2009-09-19 |
| Duane Ludwig | 21-14-0 | 2012-09-29 |
| Duda Santana | 3-1-0 | 2019-06-01 |
| Dustin Hazelett | 12-7-0 | 2010-12-11 |
| Dustin Kimura | 11-3-0 | 2014-12-13 |
| Dustin Neace | 25-21-1 (1 NC) | 2011-12-03 |
| Dustin Ortiz | 19-8-0 | 2019-01-19 |
| Dustin Pague | 12-11-0 | 2013-10-19 |
| Dwayne Cason | 1-1-0 | 1997-10-17 |
| Dwight Grant | 11-6-0 | 2022-07-16 |
| Dylan Andrews | 18-7-0 (1 NC) | 2015-05-09 |
| Edilberto de Oliveira | 29-15-2 | 2007-09-19 |
| Edwin DeWees | 38-17-0 (1 NC) | 2006-11-11 |
| Eldo Xavier Dias | 0-1-0 | 1994-12-16 |
| Emily Ducote | 13-9-0 | 2024-05-18 |
| Evan Dunham | 18-9-1 | 2020-06-06 |
| Geraldo de Freitas | 12-6-0 | 2020-11-14 |
| Germaine de Randamie | 10-5-0 | 2024-04-06 |
| Gloria de Paula | 6-5-0 | 2022-06-18 |
| Hacran Dias | 23-6-1 | 2017-10-28 |
| Hakeem Dawodu | 13-4-1 | 2023-08-12 |
| Henrique da Silva | 14-5-0 | 2017-09-22 |
| Houston Dorr | 1-2-0 | 1997-10-17 |
| Hugo Duarte | 6-3-0 | 1998-05-15 |
| Isabela de Padua | 5-2-0 | 2019-11-16 |
| Jarjis Danho | 7-1-1 (1 NC) | 2021-04-10 |
| Jason Day | 19-12-0 | 2009-03-07 |
| Jason DeLucia | 33-21-1 | 1999-11-19 |
| Jason Dent | 22-13-0 | 2009-11-21 |
| Jessamyn Duke | 3-5-0 (1 NC) | 2015-07-25 |
| Joe Doerksen | 51-16-0 | 2010-12-11 |
| Joe Duffy | 16-5-0 | 2020-07-18 |
| John Dodson | 22-12-0 | 2020-08-15 |
| John Dowdy | 0-1-0 | 1995-04-07 |
| Jon Delos Reyes | 8-5-0 | 2015-10-24 |
| Jorge de Oliveira | 9-2-0 | 2015-03-21 |
| Junior Dos Santos | 21-9-0 | 2020-12-12 |
| Kelly Dullanty | 4-2-0 | 2002-03-22 |
| Luiz Dutra | 13-6-1 | 2015-05-30 |