Poids Mouches Hommes
 | Jimmy Flick | 2-4-0 UFC | #2170 |  |
 | Joby Sanchez | 1-4-0 UFC | #2927 | |
 | John Moraga | 8-6-0 UFC | #1179 | |
 | Jon delos Reyes | 1-3-0 UFC | #3522 |  |
 | Jordan Espinosa | 2-4-0 UFC | #2467 | |
 | Jose Maria Tome | 0-2-0 UFC | #4997 |  |
 | Jose Ochoa | 1-2-0 UFC | #1437 |  |
 | Joseph Benavidez | 15-6-0 UFC | #202 | |
 | Joseph Morales | 3-2-0 UFC | #690 | |
 | Josh Ferguson | 0-2-0 UFC | #4629 | |
 | Josh Sampo | 1-3-0 UFC | #3861 | |
 | Joshua Van | 9-1-0 UFC | #24 |  |
 | Juancamilo Ronderos | 0-2-0 UFC | #4756 |  |
 | Jussier da Silva | 9-7-0 UFC | #944 | |
 | Justin Scoggins | 4-5-0 UFC | #2412 | |
 | Kai Asakura | 0-2-0 UFC | #727 |  |
 | Kai Kara-France | 8-5-0 UFC | #403 |  |
 | Kevin Borjas | 1-4-0 UFC | #1293 | |
 | Kiru Sahota | 0-1-0 UFC | #3090 |  |
 | Kyoji Horiguchi | 9-1-0 UFC | #56 | |