Poids Mi-Moyens Hommes
 | Jutaro Nakao | 1-1-0 UFC | #4852 |  |
 | K.J. Noons | 2-3-0, 1NC UFC | #3431 |  |
 | Kacper Koziorzebski | 5-2-0 REC | #1356 |  |
 | Kaik Brito | 5-3-0 REC | #898 |  |
 | Kamal Dzhalavov | 1-0-0 REC | #3029 |  |
 | Kamaru Usman | 16-3-0 UFC | #29 |  |
 | Karim Adem | #7888 |  | |
 | Karim Ghajji | 0-3-0 REC | #4208 |  |
 | Karim Rabei | 0-1-0, 1NC REC | #5014 |  |
 | Karl Amoussou | 0-2-0 REC | #3773 | |
 | Karo Parisyan | 8-4-0, 1NC UFC | #1238 | |
 | Karol Skrzypek | 0-1-0 REC | #5968 | |
 | Kassius Kayne | 0-1-0 REC | #7668 | |
 | Kazushi Sakuraba | 1-0-0, 1NC UFC | #3861 | |
 | Keita Nakamura | 4-7-0 UFC | #2328 | |
 | Keith Wisniewski | 0-4-0 UFC | #4078 | |
 | Kelvin Rayford | 0-1-0 REC | #6782 | |
 | Ken Burrs | 0-1-0 REC | #6015 | |
 | Kenan Song | 6-5-0 UFC | #1544 |  |
 | Kendly St. Louis | 3-2-0 REC | #2148 | |