Poids Moyens Hommes
 | Kazuhiro Nakamura | 0-2-0 UFC | #4977 |  |
 | KB Bhullar | 0-2-0 UFC | #5575 |  |
 | Keiichiro Yamamiya | 0-1-0 UFC | #7208 | |
 | Keith Jardine | 6-7-0 UFC | #1705 |  |
 | Keith Rockel | 1-1-0 UFC | #5475 | |
 | Kellian Streicher | #8013 |  | |
 | Kelvin Gastelum | 14-11-0, 1NC UFC | #242 | |
 | Kendall Grove | 7-6-0 UFC | #1817 | |
 | Kenichi Yamamoto | 2-1-0 UFC | #3673 | |
 | Kennedy Rayomba | 0-2-0 REC | #4600 |  |
 | Kerim Engizek | 6-2-0 REC | #1141 |  |
 | Kevin Casey | 1-3-1, 2NC UFC | #3691 | |
 | Kevin Del | 2-0-0 REC | #2039 | |
 | Kevin Hangs | 0-1-0 REC | #5819 | |
 | Keyes Nelson | 0-1-0 REC | #7596 | |
 | Khadzhimurat Bestaev | 0-2-0 REC | #6003 |  |
 | Khamzat Chimaev | 9-1-0 UFC | #29 |  |
 | Kirill Medvedovski | 0-1-0 REC | #7313 |  |
 | Korey Kuppe | 0-3-0 REC | #5219 | |
 | Kris McCray | 0-3-0 UFC | #4340 | |