Poids Moyens Hommes
 | Ole Magnor | 2-2-0 REC | #4546 |  |
 | Oleg Nagorny | 0-1-0 REC | #7505 |  |
 | Oluwale Bamgbose | 1-4-0 UFC | #3619 |  |
 | Omar Amasha | #7773 |  | |
 | Ondrej Raska | 4-3-0 REC | #1444 |  |
 | Oscar Ravello | #8048 |  | |
 | Oskar Piechota | 2-3-0, 1NC UFC | #3791 |  |
 | Ourouzmag Magkeyev | 0-1-0 REC | #4419 |  |
 | Owain Williams | 0-1-0 REC | #7102 |  |
 | Ozzy Diaz | 1-2-0 UFC | #1443 | |
 | Paddy McCorry | 6-0-0 REC | #806 |  |
 | Pat Downey | 1-1-0 REC | #4660 | |
 | Patrik Jevicky | 0-1-0 REC | #7790 |  |
 | Patrik Kincl | 6-2-0 REC | #327 | |
 | Paul Herrera | 0-1-0 UFC | #4627 | |
 | Paul Kulze | 0-1-0 REC | #6187 | |
 | Paul Smith | 0-1-0 REC | #7089 |  |
 | Paulo Santos | 0-1-0 UFC | #5939 |  |
 | Pavel Salcak | 1-2-1 REC | #5495 | |
 | Pavel Toth | 0-1-0 REC | #5197 | |