| Fighter | Record | Last Bout |
|---|---|---|
| Byron Bloodworth | 6-3-0 | 2012-12-29 |
| Carlos Barreto | 14-9-0 | 1997-10-17 |
| Charles Byrd | 10-7-0 | 2020-06-06 |
| Charlie Brenneman | 19-8-0 | 2014-11-08 |
| Chris Beal | 10-5-0 | 2016-06-18 |
| Chris Brennan | 21-13-1 | 2002-01-11 |
| Dakota Bush | 8-4-0 | 2022-01-15 |
| Damien Brown | 17-12-0 | 2018-02-10 |
| Dan Barrera | 3-1-0 | 2007-12-08 |
| Dan Bobish | 17-9-0 | 1997-07-27 |
| Danilo Belluardo | 12-5-0 | 2019-09-28 |
| 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 |
| Dennis Bermudez | 17-9-0 | 2019-01-19 |
| Denys Bondar | 14-5-0 | 2024-02-24 |
| Derek Brunson | 23-9-0 | 2023-03-04 |
| Diego Brandao | 22-11-0 | 2016-01-02 |
| Dieusel Berto | 0-3-0 | 1996-07-12 |
| Ebenezer Fontes Braga | 13-7-2 | 1998-10-16 |
| Enrique Barzola | 17-5-2 | 2020-03-14 |
| 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 |
| Galore Bofando | 5-3-0 | 2017-12-16 |
| 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 |
| Izabela Badurek | 6-3-0 | 2015-04-11 |
| JP Buys | 9-6-0 | 2023-08-12 |
| James Bochnovic | 8-3-0 | 2018-05-12 |
| Jarred Brooks | 13-2-0 | 2018-09-08 |
| Jason Black | 23-4-1 | 2007-10-20 |
| Jason Brilz | 22-6-1 | 2011-11-19 |
| Jerry Bohlander | 11-4-0 | 1999-01-08 |
| Jesse Bongfeldt | 16-5-1 | 2011-06-11 |
| Jesse Butler | 12-6-0 | 2024-06-08 |
| Joe Brammer | 7-3-1 | 2010-05-29 |
| Joey Beltran | 17-14-0 (1 NC) | 2013-10-09 |
| Johnny Bedford | 21-13-1 (1 NC) | 2014-09-13 |
| Jonathan Brookins | 16-10-0 | 2012-12-15 |
| Joseph Benavidez | 28-8-0 | 2021-03-06 |
| Josh Barnett | 35-8-0 | 2016-09-03 |
| Josh Bryant | 15-4-0 | 2010-06-19 |
| Joshua Burkman | 28-16-0 (1 NC) | 2018-02-18 |