Poids Mouches Hommes
 | Josua Hernandez | 0-1-0 REC | #6840 |  |
 | Juan Puerta | 1-0-0 REC | #7181 |  |
 | Juancamilo Ronderos | 0-2-0 UFC | #4937 |  |
 | Jung Hyun Lee | 1-2-0 REC | #1632 |  |
 | Junior Assis | 0-1-0 REC | #7455 |  |
 | Juscelino Pantoja | 0-1-0 REC | #6072 | |
 | Jussier da Silva | 9-7-0 UFC | #1049 | |
 | Justin Scoggins | 4-5-0 UFC | #2691 | |
 | Kai Kara-France | 8-5-0 UFC | #538 |  |
 | Kai Yoshida | 0-1-0 REC | #5309 |  |
 | Kaito Oda | 0-1-0 REC | #6074 | |
 | Kanean Catron | 1-0-0 REC | #1560 | |
 | Kayck Alencar | 0-1-0 REC | #6238 | |
 | Kendrick Latchman | 0-1-0 REC | #6073 | |
 | Kentaro Tomita | 0-1-0 REC | #6859 | |
 | Kevin Borjas | 2-4-0 UFC | #645 |  |
 | Kevin Fernandez | 4-0-0 REC | #1308 | |
 | Keynan Davis | 1-2-0 REC | #5337 | |
 | Khamzat Ilyasov | 1-1-0 REC | #3068 |  |
 | Khavid Dakaev | 2-0-0 REC | #1929 | |