| Fighter | Record | Last Bout |
|---|---|---|
| Ben Askren | 19-2-0 (1 NC) | 2019-10-26 |
| Ben Earwood | 12-3-0 | 2000-11-17 |
| Ben Johnston | 5-2-0 | 2026-05-02 |
| Ben Nguyen | 16-8-0 | 2018-12-01 |
| Ben Rothwell | 39-14-0 | 2021-11-13 |
| Ben Saunders | 22-13-2 | 2019-12-14 |
| Ben Sosoli | 7-3-0 (2 NC) | 2020-02-22 |
| Ben Wall | 8-7-1 | 2014-05-10 |
| Benardo Sopaj | 13-3-0 | 2026-10-03 |
| Beneil Dariush | 23-8-1 | 2026-05-02 |
| Benito Lopez | 10-2-0 | 2022-11-05 |
| Benji Radach | 21-7-0 (1 NC) | 2002-09-27 |
| Benoit Saint Denis | 17-4-0 (1 NC) | 2026-07-11 |
| Benson Henderson | 24-7-0 | 2015-11-28 |
| Bentley Syler | 5-1-0 | 2015-03-21 |
| Bernardo Magalhaes | 13-4-0 | 2012-06-08 |
| Besam Yousef | 7-4-0 | 2013-04-06 |
| Bethe Correia | 11-6-1 | 2021-10-02 |
| Bevon Lewis | 7-3-0 | 2020-11-07 |
| Bharat Kandare | 5-3-0 | 2017-11-25 |
| Bia Mesquita | 8-0-0 | 2026-06-20 |
| Bilal Hasan | 10-0-0 (1 NC) | 2026-08-29 |
| Bill Algeo | 18-9-0 | 2024-07-20 |
| Bill Mahood | 20-7-1 (1 NC) | 2005-06-04 |
| Billy Elekana | 10-2-0 | 2026-01-31 |
| Billy Miles | 2-2-0 | 2007-12-08 |
| Billy Quarantillo | 18-8-0 | 2026-08-08 |
| Billy Ray Goff | 9-5-0 | 2026-08-08 |
| BJ Penn | 16-14-2 | 2019-05-11 |
| Blagoy Ivanov | 19-6-0 (1 NC) | 2023-07-01 |
| Blake Bilder | 8-2-1 | 2024-02-03 |
| Blood Diamond | 3-3-0 | 2023-09-09 |
| Bo Nickal | 9-1-0 | 2026-06-14 |
| Bob Cook | 5-0-0 | 2000-03-10 |
| Bob Gilstrap | 5-7-0 | 1998-05-15 |
| Bobby Hoffman | 36-10-1 (2 NC) | 2001-11-02 |
| Bobby Moffett | 13-5-0 (1 NC) | 2019-08-10 |
| Bobby Nash | 8-4-0 | 2017-11-25 |
| Bobby Southworth | 10-6-0 (1 NC) | 2005-04-09 |
| Bobby Voelker | 19-13-0 | 2014-06-07 |
| Bogdan Grad | 16-4-0 | 2026-08-01 |
| Bogdan Guskov | 18-4-1 | 2026-07-25 |
| Bojan Mihajlovic | 10-6-0 | 2017-09-02 |
| Bojan Velickovic | 15-6-1 | 2017-11-18 |
| Bolaji Oki | 10-4-0 | 2026-03-14 |
| Borislav Nikolic | 17-2-0 | 2026-08-01 |
| Boston Salmon | 6-3-0 | 2019-10-18 |
| Brad Blackburn | 18-13-1 (1 NC) | 2010-04-10 |
| Brad Gumm | 10-6-1 (1 NC) | 2000-09-22 |
| Brad Imes | 13-7-0 | 2007-04-07 |