Poids Mouches Hommes
 | Jose Vasquez | 0-1-0 REC | #5508 |  |
 | Joseph Benavidez | 15-6-0 UFC | #213 | |
 | Joseph Camacho | 0-1-0 REC | #7007 |  |
 | Joseph Hobbs | 0-1-0 REC | #6242 | |
 | Joseph Larcinese | 1-0-0 REC | #1525 |  |
 | Joseph Morales | 3-2-0 UFC | #1127 | |
 | Josh Ferguson | 0-2-0 UFC | #5030 | |
 | Josh Sampo | 1-3-0 UFC | #4141 | |
 | Joshua Perreira | 1-0-0 REC | #6571 | |
 | Joshua Van | 10-1-0 UFC | #11 |  |
 | Josiah Reyes | 1-1-0 REC | #5226 | |
 | Jostin Quilca | 0-1-0 REC | #5323 |  |
 | Juan Puerta | 1-0-0 REC | #6795 | |
 | Juancamilo Ronderos | 0-2-0 UFC | #4772 |  |
 | Jung Hyun Lee | 1-2-0 REC | #1152 |  |
 | Junior Assis | 0-1-0 REC | #7100 |  |
 | Juscelino Pantoja | 0-1-0 REC | #6159 | |
 | Jussier da Silva | 9-7-0 UFC | #1022 | |
 | Justin Scoggins | 4-5-0 UFC | #2631 | |
 | Kai Kara-France | 8-5-0 UFC | #501 |  |