| Fighter | Record | Last Bout |
|---|---|---|
| Brendon Marotte | 8-3-0 | 2024-09-07 |
| Brendson Ribeiro | 17-11-0 (1 NC) | 2026-07-25 |
| Brett Johns | 17-2-0 | 2020-07-18 |
| Brian Bowles | 10-3-0 | 2013-05-25 |
| Brian Camozzi | 7-5-0 | 2018-02-18 |
| Brian Cobb | 20-9-0 | 2009-02-21 |
| Brian Ebersole | 51-18-1 (1 NC) | 2015-06-06 |
| Brian Foster | 27-10-0 | 2010-11-20 |
| Brian Gassaway | 29-20-2 (1 NC) | 2005-08-20 |
| Brian Geraghty | 26-18-1 | 2007-06-23 |
| Brian Houston | 4-6-0 | 2014-01-15 |
| Brian Johnston | 5-5-0 | 1997-07-27 |
| Brian Kelleher | 24-16-0 | 2024-07-20 |
| Brian Melancon | 7-3-0 | 2013-08-28 |
| Brian Ortega | 16-5-0 (1 NC) | 2026-09-19 |
| Brian Stann | 12-6-0 | 2013-03-02 |
| Brianna Fortino | 9-3-0 | 2020-06-20 |
| Bristol Marunde | 16-10-0 | 2013-08-03 |
| Brock Jardine | 12-6-0 | 2013-02-23 |
| Brock Larson | 42-10-0 | 2009-11-21 |
| Brock Lesnar | 5-3-0 (1 NC) | 2016-07-09 |
| Brodie Farber | 16-7-0 | 2008-12-10 |
| Brogan Walker | 8-5-0 | 2025-10-04 |
| Brok Weaver | 15-6-0 | 2020-09-12 |
| Bruna Brasil | 11-7-1 | 2026-03-28 |
| Brunno Ferreira | 15-4-0 | 2026-09-19 |
| Bruno Korea | 7-3-0 | 2015-11-07 |
| Bruno Lopes | 14-4-0 | 2026-08-08 |
| Bruno Santos | 15-2-0 | 2014-10-04 |
| Bruno Silva | 15-9-2 (1 NC) | 2026-06-06 |
| Bruno Silva | 23-13-0 | 2025-05-10 |
| Bruno Souza | 10-3-0 | 2022-03-26 |
| Bryan Barberena | 18-12-0 | 2024-03-16 |
| Bryan Battle | 13-2-0 (1 NC) | 2024-12-07 |
| Bryan Caraway | 21-9-0 | 2018-11-30 |
| Bryce Mitchell | 19-4-0 | 2026-06-06 |
| Bubba Bush | 8-3-0 (1 NC) | 2015-10-24 |
| Buddy Roberts | 12-3-0 | 2012-08-11 |
| Byron Bloodworth | 6-3-0 | 2012-12-29 |
| Caio Borralho | 18-2-0 (1 NC) | 2026-03-07 |
| 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 Barnett | 23-10-0 | 2025-10-25 |
| Chris Beal | 10-5-0 | 2016-06-18 |
| Chris Brennan | 21-13-1 | 2002-01-11 |
| Cody Brundage | 12-9-1 (1 NC) | 2026-05-16 |
| Curtis Blaydes | 19-6-0 (1 NC) | 2026-09-12 |
| Da'Mon Blackshear | 17-8-1 | 2025-07-26 |
| Dakota Bush | 8-4-0 | 2022-01-15 |