Poids Mouches Hommes
 | Jesus Aguilar | 4-3-0 UFC | #1145 |  |
 | Jhonata Silva | 1-1-0 REC | #5932 |  |
 | Jhonatan Oliveira | 1-2-0 REC | #3116 | |
 | Jimi Natividad | 0-1-0 REC | #6127 |  |
 | Jimmy Flick | 2-4-0 UFC | #2343 |  |
 | Jin Tanaka | #7935 |  | |
 | Jiniushiyue | 3-2-0 REC | #1183 |  |
 | Jo Arai | 0-2-0 REC | #4510 | |
 | Joao Elias | 0-1-0 REC | #6355 | |
 | Joao Victor Melo | 0-1-0 REC | #6465 | |
 | Joby Sanchez | 1-4-0 UFC | #3144 | |
 | Joe Fields | 6-0-0 REC | #500 |  |
 | Joe Hiramoto | 2-1-0 REC | #643 | |
 | John Dave Almanza | 0-1-0 REC | #5728 | |
 | John Moraga | 8-6-0 UFC | #1315 | |
 | Jon delos Reyes | 1-3-0 UFC | #3803 |  |
 | Jonny Touma | 0-2-0 REC | #4100 |  |
 | Jordan Burkholder | 1-4-0 REC | #3265 | |
 | Jordan Espinosa | 2-4-0 UFC | #2665 | |
 | Jordan Harris | 1-1-0 REC | #6264 | |