Poids Mouches Hommes
 | Joshua Perreira | 1-0-0 REC | #6430 |  |
 | Joshua Van | 9-1-0 UFC | #23 |  |
 | Josiah Reyes | 1-1-0 REC | #5110 | |
 | Jostin Quilca | 0-1-0 REC | #5171 |  |
 | Juan Puerta | 1-0-0 REC | #6541 | |
 | Juancamilo Ronderos | 0-2-0 UFC | #4853 |  |
 | Jung Hyun Lee | 1-2-0 REC | #902 |  |
 | Junior Assis | 0-1-0 REC | #6923 |  |
 | Juscelino Pantoja | 0-1-0 REC | #6160 | |
 | 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 |  |
 | Kai Yoshida | 0-1-0 REC | #4776 | |
 | Kaito Oda | #7720 | | |
 | Kanean Catron | 1-0-0 REC | #782 | |
 | Kendrick Latchman | 0-1-0 REC | #6548 | |
 | Kevin Borjas | 1-4-0 UFC | #1434 |  |
 | Kevin Fernandez | 3-0-0 REC | #3547 | |
 | Keynan Davis | 1-2-0 REC | #4971 | |