Poids Moyens Hommes
 | Julian Marquez | 3-5-0 UFC | #1826 |  |
 | Julien Leblanc | #7343 |  | |
 | Julio Spadaccini | 1-0-0 REC | #952 |  |
 | Jun Yong Park | 9-4-0 UFC | #519 |  |
 | Junior Orgulho | 0-1-0 REC | #6667 | |
 | Justin Barry | 0-1-0 REC | #6518 | |
 | Justin Levens | 0-2-0 UFC | #5442 | |
 | Kacper Karski | 0-1-0 REC | #6609 |  |
 | Kacper Pakeltys | 1-0-0 REC | #1614 | |
 | Kailan Hill | 0-1-0 REC | #6079 |  |
 | Kamil Oniszczuk | 2-3-0 REC | #656 | |
 | Kamil Wojciechowski | 0-2-0 REC | #5707 | |
 | Karl Roberson | 4-6-0 UFC | #1985 | |
 | Kazuhiro Nakamura | 0-2-0 UFC | #4615 |  |
 | KB Bhullar | 0-2-0 UFC | #5183 | |
 | Keiichiro Yamamiya | 0-1-0 UFC | #6700 | |
 | Keith Jardine | 6-7-0 UFC | #1623 | |
 | Keith Rockel | 1-1-0 UFC | #5277 | |
 | Kellian Streicher | #7519 |  | |
 | Kelvin Gastelum | 14-10-0, 1NC UFC | #213 | |