Poids Mouches Hommes
 | Jesus Aguilar | 4-3-0 UFC | #1067 |  |
 | Jimmy Flick | 2-4-0 UFC | #2280 |  |
 | Joby Sanchez | 1-4-0 UFC | #3057 | |
 | John Moraga | 8-6-0 UFC | #1267 | |
 | Jon delos Reyes | 1-3-0 UFC | #3674 |  |
 | Jordan Espinosa | 2-4-0 UFC | #2608 | |
 | Jose Maria Tome | 0-2-0 UFC | #5226 |  |
 | Jose Ochoa | 1-2-0 UFC | #1518 |  |
 | Joseph Benavidez | 15-6-0 UFC | #220 | |
 | Joseph Morales | 3-2-0 UFC | #943 | |
 | Josh Ferguson | 0-2-0 UFC | #4850 | |
 | Josh Sampo | 1-3-0 UFC | #4005 | |
 | Joshua Van | 9-1-0 UFC | #23 |  |
 | Juancamilo Ronderos | 0-2-0 UFC | #4853 |  |
 | Jussier da Silva | 9-7-0 UFC | #1013 | |
 | Justin Scoggins | 4-5-0 UFC | #2560 | |
 | Kai Asakura | 0-2-0 UFC | #776 |  |
 | Kai Kara-France | 8-5-0 UFC | #490 |  |
 | Kevin Borjas | 1-4-0 UFC | #1434 | |
 | Kiru Sahota | 0-1-0 UFC | #2801 |  |