Poids Mouches Hommes
 | Jesus Aguilar | 4-3-0 UFC | #1094 |  |
 | Jimmy Flick | 2-4-0 UFC | #2274 |  |
 | Joby Sanchez | 1-4-0 UFC | #3061 | |
 | John Moraga | 8-6-0 UFC | #1260 | |
 | Jon delos Reyes | 1-3-0 UFC | #3684 |  |
 | Jordan Espinosa | 2-4-0 UFC | #2600 | |
 | Jose Maria Tome | 0-2-0 UFC | #5261 |  |
 | Jose Ochoa | 1-2-0 UFC | #1502 |  |
 | Joseph Benavidez | 15-6-0 UFC | #218 | |
 | Joseph Morales | 3-2-0 UFC | #971 | |
 | Josh Ferguson | 0-2-0 UFC | #4848 | |
 | Josh Sampo | 1-3-0 UFC | #4021 | |
 | Joshua Van | 9-1-0 UFC | #24 |  |
 | Juancamilo Ronderos | 0-2-0 UFC | #4829 |  |
 | Jussier da Silva | 9-7-0 UFC | #1010 | |
 | Justin Scoggins | 4-5-0 UFC | #2570 | |
 | Kai Asakura | 0-2-0 UFC | #726 |  |
 | Kai Kara-France | 8-5-0 UFC | #487 |  |
 | Kevin Borjas | 1-4-0 UFC | #1439 | |
 | Kiru Sahota | 0-1-0 UFC | #2815 |  |