Poids Mi-Moyens Hommes
 | Julien Gazagnaire | 1-1-0 REC | #2423 |  |
 | Junie Browning | 1-1-0 UFC | #4414 |  |
 | Junior Hernandez | 2-0-1 REC | #2383 |  |
 | Justin Burlinson | 3-1-0 REC | #2687 |  |
 | Justin Edwards | 2-5-0 UFC | #3405 | |
 | Jutaro Nakao | 1-1-0 UFC | #4981 |  |
 | K.J. Noons | 2-3-0, 1NC UFC | #3552 | |
 | Kacper Koziorzebski | 5-2-0 REC | #1529 |  |
 | Kaik Brito | 6-3-0 REC | #212 |  |
 | Kamal Dzhalavov | 1-0-0 REC | #3244 |  |
 | Kamaru Usman | 16-4-0 UFC | #35 |  |
 | Karim Adem | #7989 | | |
 | Karim Ghajji | 0-3-0 REC | #4293 |  |
 | Karim Rabei | 0-1-0, 1NC REC | #4970 |  |
 | Karl Amoussou | 0-2-0 REC | #3898 | |
 | Karo Parisyan | 8-4-0, 1NC UFC | #1242 | |
 | Karol Skrzypek | 0-1-0 REC | #6373 | |
 | Kassius Kayne | 0-1-0 REC | #7873 | |
 | Kazushi Sakuraba | 1-0-0, 1NC UFC | #3925 | |
 | Keita Nakamura | 4-7-0 UFC | #2367 | |