Poids Lourds Hommes
 | Justin Martin | 1-0-0 UFC | #5369 |  |
 | Justin McCully | 2-2-0 UFC | #4012 | |
 | Justin Smith | 0-1-0 REC | #7342 | |
 | Justin Tafa | 4-5-0, 1NC UFC | #1442 |  |
 | Justin Willis | 4-1-0 UFC | #2807 | |
 | Justin Wren | 0-1-0 UFC | #6925 | |
 | Kacper Paczoski | 1-0-0 REC | #2247 |  |
 | Kamil Gawryjolek | 2-2-0 REC | #3923 | |
 | Kamil Minda | 2-2-0 REC | #4959 | |
 | Karl Williams | 3-1-0 UFC | #1698 |  |
 | Karrar Hammodi | #7409 |  | |
 | Kasim Aras | 2-3-0 REC | #1720 |  |
 | Katsuhisa Fujii | 1-1-0 UFC | #5525 |  |
 | Katsuyoshi Sasaki | 0-1-0 REC | #7159 | |
 | Keigo Kunihara | 0-1-0 UFC | #7158 | |
 | Kelvin Tiller | 3-4-0 REC | #3703 | |
 | Ken Shamrock | 7-6-2 UFC | #603 | |
 | Kennedy Nzechukwu | 8-6-1 UFC | #509 |  |
 | Kent Mafileo | 0-1-0 REC | #7083 | |
 | Kenzo Soares Silva | 3-2-0 REC | #2606 | |