Poids Moyens Hommes
 | Ole Magnor | 2-2-0 REC | #4593 |  |
 | Oleg Nagorny | 0-1-0 REC | #7557 |  |
 | Oluwale Bamgbose | 1-4-0 UFC | #3641 |  |
 | Omar Amasha | #7782 |  | |
 | Ondrej Raska | 4-3-0 REC | #1481 |  |
 | Oscar Ravello | #8061 |  | |
 | Oskar Piechota | 2-3-0, 1NC UFC | #3803 |  |
 | Ourouzmag Magkeyev | 0-1-0 REC | #4406 |  |
 | Owain Williams | 0-1-0 REC | #7098 |  |
 | Ozzy Diaz | 1-2-0 UFC | #1430 | |
 | Paddy McCorry | 6-0-0 REC | #855 |  |
 | Pat Downey | 1-1-0 REC | #4633 | |
 | Patrik Jevicky | 0-1-0 REC | #7843 |  |
 | Patrik Kincl | 6-2-0 REC | #393 | |
 | Paul Herrera | 0-1-0 UFC | #4632 | |
 | Paul Kulze | 0-1-0 REC | #6014 | |
 | Paul Smith | 0-1-0 REC | #7137 |  |
 | Paulo Santos | 0-1-0 UFC | #5876 |  |
 | Pavel Salcak | 1-2-1 REC | #5506 | |
 | Pavel Toth | 0-1-0 REC | #5224 | |