Poids Mi-Moyens Hommes
 | Junie Browning | 1-1-0 UFC | #4213 |  |
 | Junior Hernandez | 2-0-1 REC | #1883 |  |
 | Justin Burlinson | 3-1-0 REC | #2411 |  |
 | Justin Edwards | 2-5-0 UFC | #3253 | |
 | Jutaro Nakao | 1-1-0 UFC | #4763 |  |
 | K.J. Noons | 2-3-0, 1NC UFC | #3305 | |
 | Kacper Koziorzebski | 5-2-0 REC | #1187 |  |
 | Kaik Brito | 5-3-0 REC | #715 |  |
 | Kamal Dzhalavov | 1-0-0 REC | #2781 |  |
 | Kamaru Usman | 16-3-0 UFC | #29 |  |
 | Karim Adem | #7799 |  | |
 | Karim Ghajji | 0-3-0 REC | #4114 |  |
 | Karim Rabei | 0-1-0, 1NC REC | #5077 |  |
 | Karl Amoussou | 0-2-0 REC | #3696 | |
 | Karo Parisyan | 8-4-0, 1NC UFC | #1235 | |
 | Karol Skrzypek | 0-1-0 REC | #5594 | |
 | Kassius Kayne | 0-1-0 REC | #7449 | |
 | Kazushi Sakuraba | 1-0-0, 1NC UFC | #3738 | |
 | Keita Nakamura | 4-7-0 UFC | #2261 | |
 | Keith Wisniewski | 0-4-0 UFC | #4020 | |