Poids Mouches Hommes
 | Jerome Rivera | 0-4-0 UFC | #3417 |  |
 | Jesse Martinelli | 0-1-0 REC | #6981 | |
 | Jesus Aguilar | 4-3-0 UFC | #1203 |  |
 | Jhonata Silva | 1-1-0 REC | #6044 |  |
 | Jhonatan Oliveira | 1-2-0 REC | #3197 | |
 | Jimi Natividad | 0-1-0 REC | #6313 |  |
 | Jimmy Flick | 2-4-0 UFC | #2356 | |
 | Jin Tanaka | #7982 |  | |
 | Jiniushiyue | 3-2-0 REC | #1334 |  |
 | Jo Arai | 0-2-0 REC | #4637 | |
 | Joao Elias | 0-1-0 REC | #6429 | |
 | Joao Victor Melo | 0-1-0 REC | #6490 | |
 | Joby Sanchez | 1-4-0 UFC | #3167 | |
 | Joe Fields | 6-0-0 REC | #605 |  |
 | Joe Hiramoto | 2-1-0 REC | #814 | |
 | John Dave Almanza | 0-1-0 REC | #5864 | |
 | John Moraga | 8-6-0 UFC | #1272 | |
 | Jon delos Reyes | 1-3-0 UFC | #3787 |  |
 | Jonny Touma | 0-2-0 REC | #4230 |  |
 | Jordan Burkholder | 1-4-0 REC | #3337 | |