Poids Mouches Hommes
 | Juan Puerta | #7546 |  | |
 | Juancamilo Ronderos | 0-2-0 UFC | #5229 |  |
 | Jung Hyun Lee | #2155 |  | |
 | Junior Assis | #7846 |  | |
 | Juscelino Pantoja | 9-2-0 MMA | #6167 | |
 | Jussier da Silva | 9-7-0 UFC | #1104 | |
 | Justin Scoggins | 4-5-0 UFC | #2736 | |
 | Kai Kara-France | 8-5-0 UFC | #580 |  |
 | Kai Yoshida | #5701 |  | |
 | Kaito Oda | 8-4-0 MMA | #4262 | |
 | Kanean Catron | #2168 | | |
 | Kayck Alencar | #6498 | | |
 | Kelvin Martinez | 5-3-0 MMA | #5961 | |
 | Kendrick Latchman | #6188 | | |
 | Kentaro Tomita | #7013 | | |
 | Kevin Borjas | 2-5-0 UFC | #876 |  |
 | Kevin Caperna | 2-4-0 MMA | #2865 |  |
 | Kevin Fernandez | 10-1-0 MMA | #358 | |
 | Keynan Davis | #5681 | | |
 | Khamzat Ilyasov | #3347 |  |