| Fighter | Record | Last Bout |
|---|---|---|
| Ryan Bader | 23-5-0 | 2016-11-19 |
| Ryan Benoit | 10-8-0 | 2021-07-31 |
| Scott Baker | 1-1-0 | 1994-03-11 |
| Scott Bessac | 4-6-0 | 1995-12-16 |
| Seth Baczynski | 20-14-0 | 2015-04-11 |
| Shamar Bailey | 16-11-0 | 2011-11-19 |
| Shane Burgos | 15-3-0 | 2022-07-16 |
| Shayna Baszler | 15-11-0 | 2015-03-21 |
| Siyar Bahadurzada | 24-8-1 | 2019-09-28 |
| Stephan Bonnar | 15-9-0 | 2012-10-13 |
| Stephen Bass | 11-2-0 | 2011-12-03 |
| Steve Berger | 21-23-2 (1 NC) | 2002-06-22 |
| Steve Bosse | 12-2-0 | 2016-06-18 |
| Steve Bruno | 15-6-0 | 2009-02-07 |
| Steve Byrnes | 6-1-0 | 2006-12-13 |
| Sung Bin Jo | 9-1-0 | 2019-06-01 |
| TJ Brown | 17-11-0 | 2023-10-14 |
| Tae Hyun Bang | 18-10-0 | 2016-09-03 |
| Tai Bowden | 1-1-0 | 1996-12-07 |
| Talita Bernardo | 6-4-0 | 2019-05-11 |
| Tim Boetsch | 21-13-0 | 2019-03-09 |
| Todd Brown | 16-4-0 (1 NC) | 2011-03-03 |
| Todd Butler | 1-4-0 | 1997-07-27 |
| Tom Blackledge | 10-7-0 | 2011-02-26 |
| Tom Breese | 12-3-0 | 2021-01-20 |
| Travis Browne | 18-7-1 | 2017-07-08 |
| Vitor Belfort | 26-14-0 (1 NC) | 2018-05-12 |
| Will Brooks | 18-4-0 | 2017-11-18 |