| Fighter | Record | Last Bout |
|---|---|---|
| Damien Brown | 17-12-0 | 2018-02-10 |
| Dan Barrera | 3-1-0 | 2007-12-08 |
| Dan Bobish | 17-9-0 | 1997-07-27 |
| Daniel Barez | 17-8-0 | 2026-05-16 |
| Danilo Belluardo | 12-5-0 | 2019-09-28 |
| Danny Barlow | 9-2-0 | 2025-10-18 |
| Dave Beneteau | 6-5-1 | 1997-10-17 |
| Dave Berry | 0-1-0 | 1996-09-20 |
| David Baron | 17-4-1 | 2008-10-18 |
| David Bielkheden | 24-12-0 | 2009-04-18 |
| David Branch | 22-6-0 | 2019-03-30 |
| DeAnna Bennett | 8-3-1 | 2017-12-01 |
| Dean Barry | 4-2-0 | 2022-04-23 |
| Delphine Benouaich | 8-2-0 | 2026-09-05 |
| Dennis Bermudez | 17-9-0 | 2019-01-19 |
| Dennis Buzukja | 12-7-0 | 2026-08-01 |
| Denys Bondar | 14-5-0 | 2024-02-24 |
| Derek Brunson | 23-9-0 | 2023-03-04 |
| Diana Belbita | 15-10-0 | 2025-04-05 |
| Diego Brandao | 22-11-0 | 2016-01-02 |
| Dieusel Berto | 0-3-0 | 1996-07-12 |
| Dione Barbosa | 10-4-0 | 2026-07-18 |
| Dylan Budka | 7-5-0 | 2025-02-15 |
| Ebenezer Fontes Braga | 13-7-2 | 1998-10-16 |
| Edson Barboza | 24-15-0 | 2026-08-15 |
| Elves Brener | 16-6-0 | 2026-09-26 |
| Enrique Barzola | 17-5-2 | 2020-03-14 |
| Erin Blanchfield | 14-2-0 | 2026-10-17 |
| Farid Basharat | 16-0-0 | 2026-07-11 |
| Felipe Bunes | 14-9-0 | 2026-02-28 |
| Fernando Bruno | 15-4-0 | 2016-07-08 |
| Francimar Barroso | 19-7-0 (1 NC) | 2018-01-20 |
| Gabriel Benitez | 23-13-0 | 2024-04-27 |
| Gabriel Bonfim | 20-1-0 | 2026-11-07 |
| Galore Bofando | 5-3-0 | 2017-12-16 |
| Gaston Bolanos | 9-5-0 | 2026-06-20 |
| Gilbert Burns | 22-10-0 | 2026-04-18 |
| Henry Briones | 16-8-1 | 2018-05-19 |
| Herbert Burns | 11-6-0 | 2024-08-17 |
| Humberto Bandenay | 14-7-0 (1 NC) | 2019-08-10 |
| Humberto Brown Morrison | 4-6-0 | 2014-11-15 |
| Ignacio Bahamondes | 17-7-0 | 2026-09-12 |
| Ismael Bonfim | 20-7-0 | 2026-07-25 |
| Iwo Baraniewski | 9-0-0 | 2026-09-19 |
| Izabela Badurek | 6-3-0 | 2015-04-11 |
| JP Buys | 9-6-0 | 2023-08-12 |
| James Bochnovic | 8-3-0 | 2018-05-12 |
| Jan Blachowicz | 29-12-2 | 2026-08-01 |
| Jarred Brooks | 13-2-0 | 2018-09-08 |
| Jason Black | 23-4-1 | 2007-10-20 |