Poids Mouches Hommes
 | Juancamilo Ronderos | 0-2-0 UFC | #4858 |  |
 | Jung Hyun Lee | 1-2-0 REC | #1417 |  |
 | Junior Assis | 0-1-0 REC | #7286 |  |
 | Juscelino Pantoja | 0-1-0 REC | #6217 | |
 | Jussier da Silva | 9-7-0 UFC | #1007 | |
 | Justin Scoggins | 4-5-0 UFC | #2656 |  |
 | Kai Kara-France | 8-5-0 UFC | #513 |  |
 | Kai Yoshida | 0-1-0 REC | #5160 |  |
 | Kaito Oda | 0-1-0 REC | #6014 | |
 | Kanean Catron | 1-0-0 REC | #1330 | |
 | Kayck Alencar | 0-1-0 REC | #6383 | |
 | Kendrick Latchman | 0-1-0 REC | #6206 | |
 | Kentaro Tomita | #7999 | | |
 | Kevin Borjas | 2-4-0 UFC | #505 |  |
 | Kevin Fernandez | 4-0-0 REC | #1130 | |
 | Keynan Davis | 1-2-0 REC | #5206 | |
 | Khamzat Ilyasov | 1-1-0 REC | #2947 |  |
 | Khavid Dakaev | 2-0-0 REC | #1774 | |
 | King Rikuto | #7780 | | |
 | Kiru Sahota | 0-1-0 UFC | #2959 |  |