Tous les combattants
 | Ousmane Camara | 1-0-0 REC | #1474 |  |
 | Ovidio Bojorquez | 0-1-0 REC | #7081 |  |
 | Ovince St. Preux | 15-13-0 UFC | #286 |  |
 | Owain Williams | 0-1-0 REC | #7101 |  |
 | Owen Jason | 1-0-0 REC | #7812 | |
 | Oyatullo Muminov | 2-1-0 REC | #1333 |  |
 | Ozan Aslaner | 3-2-0 REC | #1369 |  |
 | Ozzy Diaz | 1-2-0 UFC | #1438 | |
 | Ozzy Martin | #8154 |  | |
| Pablo David | 0-1-0 REC | #7938 | |
 | Pablo dos Santos | #7892 |  | |
 | Pablo Garza | 3-3-0 UFC | #3186 | |
| Pablo Radjabou | 1-0-0 REC | #7913 | |
 | Paddy Holohan | 3-2-0 UFC | #3126 |  |
 | Paddy McCorry | 6-0-0 REC | #885 | |
 | Paddy Pimblett | 8-1-0 UFC | #32 |  |
| Paddy Rutledge | 1-0-0 REC | #1896 |  |
 | Paddy Wilkinson | 0-1-0 REC | #6393 | |
 | Paige VanZant | 5-4-0 UFC | #1771 | |
 | Pam Sorenson | 0-2-0 REC | #5460 | |
 | Pamela Boveda | 0-1-0 REC | #6334 |  |
 | Pamela Mara | 0-1-0 REC | #7660 | |
 | Panagiotis Stroumpoulis | 0-2-0 REC | #6973 |  |
 | Pannie Kianzad | 5-6-0 UFC | #2314 |  |
 | Paolo Anastasi | 0-1-0 REC | #7592 |  |