Poids Mi-Moyens Hommes
 | Juan Manuel Suarez | 0-2-0 REC | #5401 |  |
 | Julien Gazagnaire | 1-1-0 REC | #2405 |  |
 | Junie Browning | 1-1-0 UFC | #4385 |  |
 | Junior Hernandez | 2-0-1 REC | #2349 |  |
 | Justin Burlinson | 3-1-0 REC | #2670 |  |
 | Justin Edwards | 2-5-0 UFC | #3386 | |
 | Jutaro Nakao | 1-1-0 UFC | #4941 |  |
 | K.J. Noons | 2-3-0, 1NC UFC | #3534 | |
 | Kacper Koziorzebski | 5-2-0 REC | #1507 |  |
 | Kaik Brito | 6-3-0 REC | #194 |  |
 | Kamal Dzhalavov | 1-0-0 REC | #3213 |  |
 | Kamaru Usman | 16-4-0 UFC | #33 |  |
 | Karim Adem | #7978 | | |
 | Karim Ghajji | 0-3-0 REC | #4283 |  |
 | Karim Rabei | 0-1-0, 1NC REC | #4957 |  |
 | Karl Amoussou | 0-2-0 REC | #3894 | |
 | Karo Parisyan | 8-4-0, 1NC UFC | #1223 | |
 | Karol Skrzypek | 0-1-0 REC | #6303 | |
 | Kassius Kayne | 0-1-0 REC | #7848 | |
 | Kazushi Sakuraba | 1-0-0, 1NC UFC | #3922 | |