Poids Mouches Hommes
 | Junior Assis | 0-1-0 REC | #7153 |  |
 | Juscelino Pantoja | 0-1-0 REC | #6072 | |
 | Jussier da Silva | 9-7-0 UFC | #1012 | |
 | Justin Scoggins | 4-5-0 UFC | #2634 |  |
 | Kai Kara-France | 8-5-0 UFC | #506 |  |
 | Kai Yoshida | 0-1-0 REC | #4998 |  |
 | Kaito Oda | 0-1-0 REC | #6068 | |
 | Kanean Catron | 1-0-0 REC | #1154 | |
 | Kayck Alencar | #7907 | | |
 | Kendrick Latchman | 0-1-0 REC | #6270 | |
 | Kentaro Tomita | #7940 | | |
 | Kevin Borjas | 1-4-0 UFC | #1507 |  |
 | Kevin Fernandez | 3-0-0 REC | #3666 | |
 | Keynan Davis | 1-2-0 REC | #5099 | |
 | Khamzat Ilyasov | 1-1-0 REC | #2848 |  |
 | Khavid Dakaev | 2-0-0 REC | #1657 | |
 | King Rikuto | #7712 | | |
 | Kiru Sahota | 0-1-0 UFC | #2905 |  |
 | Kleberson Sousa | 0-1-0 REC | #6616 | |
 | Kurban Khatataev | 1-0-0 REC | #1805 | |