| Fighter | Record | Last Bout |
|---|---|---|
| Alan Jouban | 17-7-0 | 2020-11-21 |
| Anthony Johnson | 22-6-0 | 2017-04-08 |
| Antonio Carlos Junior | 11-5-0 (1 NC) | 2021-01-23 |
| Brandon Jenkins | 15-9-0 | 2022-04-16 |
| Brett Johns | 17-2-0 | 2020-07-18 |
| Brian Johnston | 5-5-0 | 1997-07-27 |
| Brock Jardine | 12-6-0 | 2013-02-23 |
| Carlo Pedersoli Jr. | 11-3-0 | 2019-02-23 |
| Carls John De Tomas | 6-2-0 | 2017-12-09 |
| Chan Sung Jung | 17-8-0 | 2023-08-26 |
| Chan-Mi Jeon | 5-2-0 | 2017-09-22 |
| Cristiane Justino | 21-2-0 (1 NC) | 2019-07-27 |
| DaMarques Johnson | 15-15-0 | 2012-09-29 |
| Daniel Jolly | 5-3-0 | 2017-02-04 |
| Dashon Johnson | 9-2-0 | 2014-09-13 |
| Demetrious Johnson | 27-3-1 | 2018-08-04 |
| Eugene Jackson | 15-9-1 | 2002-07-13 |
| Ivan Jorge | 27-7-0 | 2015-07-18 |
| Jacare Souza | 26-10-0 (1 NC) | 2021-05-15 |
| Jack Marshman | 23-10-0 | 2020-10-31 |
| Jack May | 9-3-0 | 2014-08-16 |
| Jack McGlaughlin | 1-4-0 | 1995-07-14 |
| Jack Nilson | 2-6-0 | 1997-05-30 |
| Jackie Lee | 0-1-0 | 1997-02-07 |
| Jacob Kilburn | 8-4-0 | 2021-01-16 |
| Jacob Volkmann | 19-7-0 | 2013-02-02 |
| Jake Collier | 13-10-0 | 2023-09-23 |
| Jake Ellenberger | 31-15-0 | 2018-08-25 |
| Jake Hecht | 11-4-0 | 2012-06-08 |
| Jake Lindsey | 12-7-0 | 2015-03-14 |
| Jake O'Brien | 15-4-0 | 2009-07-11 |
| Jake Rosholt | 12-5-0 (1 NC) | 2009-11-21 |
| Jake Shields | 31-9-1 (1 NC) | 2014-03-15 |
| James Bochnovic | 8-3-0 | 2018-05-12 |
| James Giboo | 13-5-0 | 2008-07-19 |
| James Hammortree | 6-3-0 | 2010-06-19 |
| James Head | 9-4-0 | 2013-08-28 |
| James Irvin | 17-10-0 (2 NC) | 2010-08-01 |
| James Krause | 28-9-0 | 2020-10-17 |
| James Lee | 15-3-0 (1 NC) | 2008-01-19 |
| James McSweeney | 15-15-0 | 2010-10-16 |
| James Moontasri | 9-5-0 | 2016-12-17 |
| James Mulheron | 11-2-0 | 2017-07-16 |
| James Te Huna | 16-9-0 | 2016-03-19 |
| James Toney | 0-1-0 | 2010-08-28 |
| James Vick | 13-5-0 | 2019-10-12 |
| James Wilks | 7-4-0 | 2010-10-16 |
| James Zikic | 21-10-2 | 2002-07-13 |
| Jamey Simmons | 7-4-0 | 2021-08-07 |
| Jamie Moyle | 4-3-0 | 2018-07-07 |