Tous les combattants
 | Ousmane Camara | 1-0-0 REC | #1525 |  |
 | Oussama El Idrissi | #8248 |  | |
 | Ovidio Bojorquez | 0-1-0 REC | #7126 |  |
 | Ovince St. Preux | 15-13-0 UFC | #296 |  |
 | Owain Williams | 0-1-0 REC | #7121 |  |
 | Owen Jason | 1-0-0 REC | #7828 | |
 | Oyatullo Muminov | 2-1-0 REC | #1382 |  |
 | Ozan Aslaner | 3-2-0 REC | #1416 |  |
 | Ozzy Diaz | 1-2-0 UFC | #1441 | |
 | Ozzy Martin | #8170 |  | |
| Pablo David | 0-1-0 REC | #7970 | |
 | Pablo dos Santos | #7920 |  | |
 | Pablo Garza | 3-3-0 UFC | #3202 | |
| Pablo Radjabou | 1-0-0 REC | #7941 | |
 | Paddy Holohan | 3-2-0 UFC | #3150 |  |
 | Paddy McCorry | 6-0-0 REC | #917 | |
 | Paddy Pimblett | 8-1-0 UFC | #37 |  |
| Paddy Rutledge | 1-0-0 REC | #1928 |  |
 | Paddy Wilkinson | 0-1-0 REC | #6423 | |
 | Paige VanZant | 5-4-0 UFC | #1773 | |
 | Pam Sorenson | 0-2-0 REC | #5474 | |
 | Pamela Boveda | 0-1-0 REC | #6376 |  |
 | Pamela Mara | 0-1-0 REC | #7690 | |
 | Panagiotis Stroumpoulis | 0-2-0 REC | #6989 |  |
 | Pannie Kianzad | 5-6-0 UFC | #2324 |  |