Poids Mouches Hommes
 | Jimmy Flick | 2-4-0 UFC | #2331 |  |
 | Jin Tanaka | #7961 |  | |
 | Jiniushiyue | 3-2-0 REC | #1121 |  |
 | Jo Arai | 0-2-0 REC | #4431 | |
 | Joao Elias | 0-1-0 REC | #6359 |  |
 | Joao Victor Melo | 0-1-0 REC | #6404 | |
 | Joby Sanchez | 1-4-0 UFC | #3116 | |
 | Joe Fields | 6-0-0 REC | #456 |  |
 | Joe Hiramoto | 2-1-0 REC | #541 | |
 | John Dave Almanza | 0-1-0 REC | #5694 |  |
 | John Moraga | 8-6-0 UFC | #1300 | |
 | Jon delos Reyes | 1-3-0 UFC | #3774 |  |
 | Jonny Touma | 0-2-0 REC | #4068 |  |
 | Jordan Burkholder | 1-4-0 REC | #3227 | |
 | Jordan Espinosa | 2-4-0 UFC | #2667 | |
 | Jordan Harris | 1-1-0 REC | #6244 | |
 | Jordan Molinari | 3-1-0 REC | #1731 | |
 | Jose Maria Tome | 0-2-0 UFC | #5379 | |
 | Jose Ochoa | 2-2-0 UFC | #510 |  |
 | Jose Sandoval | 1-1-0 REC | #2971 |  |