Poids Mi-Moyens Hommes
 | K.J. Noons | 2-3-0, 1NC UFC | #3111 |  |
 | Kacper Koziorzebski | 5-2-0 REC | #786 |  |
 | Kaik Brito | 5-3-0 REC | #355 |  |
 | Kamal Dzhalavov | 1-0-0 REC | #2317 |  |
 | Kamaru Usman | 16-3-0 UFC | #23 |  |
 | Karim Ghajji | 0-3-0 REC | #4155 |  |
 | Karim Rabei | 0-1-0, 1NC REC | #5293 |  |
 | Karl Amoussou | 0-2-0 REC | #3533 |  |
 | Karo Parisyan | 8-4-0, 1NC UFC | #1138 | |
 | Karol Skrzypek | 0-1-0 REC | #5097 | |
 | Kassius Kayne | 0-1-0 REC | #7119 | |
 | Kazushi Sakuraba | 1-0-0, 1NC UFC | #3574 |  |
 | Keita Nakamura | 4-7-0 UFC | #2142 | |
 | Keith Wisniewski | 0-4-0 UFC | #3854 | |
 | Kelvin Rayford | 0-1-0 REC | #6048 | |
 | Ken Burrs | 0-1-0 REC | #6127 | |
 | Kenan Song | 6-5-0 UFC | #1367 |  |
 | Kendly St. Louis | 3-2-0 REC | #1679 | |
 | Kenny Robertson | 4-5-0 UFC | #2284 | |
 | Kevin Burns | 2-3-0 UFC | #3247 | |