Poids Mouches Hommes
 | Joshua Perreira | 1-0-0 REC | #6491 |  |
 | Joshua Van | 10-1-0 UFC | #20 |  |
 | Josiah Reyes | 1-1-0 REC | #5456 | |
 | Jostin Quilca | 0-1-0 REC | #5708 |  |
 | Josua Hernandez | 0-1-0 REC | #6924 |  |
 | Juan Puerta | 1-0-0 REC | #7222 | |
 | Juancamilo Ronderos | 0-2-0 UFC | #4989 |  |
 | Jung Hyun Lee | 1-2-0 REC | #1762 |  |
 | Junior Assis | 0-1-0 REC | #7543 |  |
 | Juscelino Pantoja | 0-1-0 REC | #5971 | |
 | Jussier da Silva | 9-7-0 UFC | #1043 | |
 | Justin Scoggins | 4-5-0 UFC | #2698 | |
 | Kai Kara-France | 8-5-0 UFC | #553 |  |
 | Kai Yoshida | 0-1-0 REC | #5408 |  |
 | Kaito Oda | 0-1-0 REC | #6195 | |
 | Kanean Catron | 1-0-0 REC | #1701 | |
 | Kayck Alencar | 0-1-0 REC | #6295 | |
 | Kendrick Latchman | 0-1-0 REC | #6092 | |
 | Kentaro Tomita | 0-1-0 REC | #6977 | |
 | Kevin Borjas | 2-5-0 UFC | #421 |  |