Tous les combattants
 | Otto Rodrigues | 1-1-0 REC | #6546 |  |
 | Oualy Tandia | 1-0-0 REC | #662 |  |
 | Oumar Kane | 1-0-0 REC | #2959 |  |
 | Oumar Sy | 3-2-0 UFC | #440 | |
 | Ourouzmag Magkeyev | 0-1-0 REC | #4410 | |
 | Ousmane Camara | 1-0-0 REC | #1248 | |
 | Ovidio Bojorquez | 0-1-0 REC | #6967 |  |
 | Ovince St. Preux | 15-13-0 UFC | #275 |  |
 | Owain Williams | 0-1-0 REC | #7070 |  |
 | Owen Jason | 1-0-0 REC | #7823 | |
 | Oyatullo Muminov | 2-1-0 REC | #1092 |  |
 | Ozan Aslaner | 3-2-0 REC | #1138 |  |
 | Ozzy Diaz | 1-2-0 UFC | #1417 | |
| Pablo David | 0-1-0 REC | #7837 | |
 | Pablo dos Santos | #7794 | | |
 | Pablo Garza | 3-3-0 UFC | #3137 | |
| Pablo Radjabou | 1-0-0 REC | #7856 | |
 | Paddy Holohan | 3-2-0 UFC | #3108 |  |
 | Paddy McCorry | 6-0-0 REC | #747 | |
 | Paddy Pimblett | 8-1-0 UFC | #3 |  |
| Paddy Rutledge | 1-0-0 REC | #1726 |  |
 | Paddy Wilkinson | 0-1-0 REC | #6377 | |
 | Paige VanZant | 5-4-0 UFC | #1740 | |
 | Pam Sorenson | 0-2-0 REC | #5392 | |
 | Pamela Boveda | 0-1-0 REC | #6421 |  |