| Fighter | Record | Last Bout |
|---|---|---|
| Joanne Wood | 17-8-0 | 2024-03-09 |
| Joao Pierini | 4-1-0 | 2002-06-22 |
| Joao Roque | 7-2-4 | 2000-06-09 |
| Joao Zeferino | 21-9-0 | 2013-09-04 |
| Joaquim Silva | 14-6-0 | 2025-09-13 |
| Joaquin Buckley | 21-8-0 | 2026-10-17 |
| Joby Sanchez | 11-4-0 | 2018-11-10 |
| Jocelyn Jones-Lybarger | 6-4-0 | 2017-01-15 |
| Jodie Esquibel | 6-6-0 | 2019-08-17 |
| Joe Brammer | 7-3-1 | 2010-05-29 |
| Joe Charles | 6-13-0 | 1997-12-21 |
| Joe Doerksen | 51-16-0 | 2010-12-11 |
| Joe Duffy | 16-5-0 | 2020-07-18 |
| Joe Ellenberger | 15-2-0 | 2014-12-13 |
| Joe Giannetti | 6-1-0 | 2018-07-06 |
| Joe Jordan | 49-14-2 | 2006-07-08 |
| Joe Kropschot | 9-3-0 | 2026-10-31 |
| Joe Lauzon | 28-16-0 | 2019-10-18 |
| Joe Merritt | 7-2-0 | 2015-06-27 |
| Joe Moreira | 2-2-0 | 1997-07-27 |
| Joe Pardo | 4-6-0 | 1998-05-15 |
| Joe Proctor | 11-5-0 | 2017-04-22 |
| Joe Pyfer | 16-3-0 | 2026-03-28 |
| Joe Riggs | 44-17-0 (1 NC) | 2016-02-21 |
| Joe Slick | 16-5-3 | 2000-04-14 |
| Joe Solecki | 13-6-0 | 2025-01-11 |
| Joe Son | 0-4-0 | 1994-12-16 |
| Joe Soto | 18-7-0 | 2018-02-03 |
| Joe Stevenson | 33-16-0 | 2011-06-26 |
| Joe Vedepo | 18-9-0 | 2009-04-01 |
| Joe Veres | 4-3-0 | 2008-01-23 |
| Joel Alvarez | 23-5-0 | 2026-08-15 |
| Joel Sutton | 2-4-1 | 1995-09-08 |
| Joey Beltran | 17-14-0 (1 NC) | 2013-10-09 |
| Joey Gambino | 9-2-0 | 2012-10-13 |
| Joey Gilbert | 2-3-0 | 2001-05-04 |
| Joey Gomez | 6-2-0 | 2016-09-17 |
| Joey Roberts | 4-3-0 | 1999-03-05 |
| John Albert | 6-5-0 | 2013-07-27 |
| John Alessio | 35-17-0 (2 NC) | 2012-07-07 |
| John Allan | 13-7-0 (1 NC) | 2021-11-06 |
| John Campetella | 0-1-0 | 1996-07-12 |
| John Castaneda | 21-8-1 | 2026-09-26 |
| John Cholish | 8-3-0 | 2013-05-18 |
| John Cofer | 8-4-0 | 2012-12-15 |
| John Dodson | 22-12-0 | 2020-08-15 |
| John Dowdy | 0-1-0 | 1995-04-07 |
| John Garza | 6-2-0 | 2026-07-11 |
| John Gunderson | 35-16-2 | 2010-09-15 |
| John Gunther | 5-1-0 | 2018-11-10 |