Poids Mouches Hommes
 | Junior Assis | 0-1-0 REC | #6785 |  |
 | Juscelino Pantoja | 0-1-0 REC | #6061 | |
 | Jussier da Silva | 9-7-0 UFC | #970 | |
 | Justin Scoggins | 4-5-0 UFC | #2486 |  |
 | Kai Asakura | 0-2-0 UFC | #804 |  |
 | Kai Kara-France | 8-5-0 UFC | #452 |  |
 | Kai Yoshida | 0-1-0 REC | #4648 | |
 | Kaito Oda | #7633 | | |
 | Kanean Catron | 1-0-0 REC | #582 | |
 | Kendrick Latchman | 0-1-0 REC | #6432 | |
 | Kevin Borjas | 1-4-0 UFC | #1364 |  |
 | Kevin Fernandez | 3-0-0 REC | #3452 | |
 | Keynan Davis | 1-2-0 REC | #4843 | |
 | Khamzat Ilyasov | 1-1-0 REC | #2381 |  |
 | Khavid Dakaev | 2-0-0 REC | #1126 | |
 | Kholmurod Nurmatov | 1-3-0 REC | #1689 |  |
 | King Rikuto | #7406 | | |
 | Kiru Sahota | 0-1-0 UFC | #2736 |  |
 | Kleberson Sousa | 0-1-0 REC | #6204 | |
 | Kurban Khatataev | 1-0-0 REC | #1250 | |