Poids Légers Hommes
 | Omiel Brown | 9-2-0 REC | #261 |  |
 | Ondrej Petrasek | 1-1-0 REC | #6467 |  |
 | Orlando Wilson Prins | 2-4-0 REC | #2983 |  |
 | Oron Kahlon | 0-1-0 REC | #5210 |  |
 | Oscar Mendez | 0-1-0 REC | #5431 |  |
 | Oscar Ownsworth | 1-3-0 REC | #3395 | |
 | Osman Minbatirov | 1-1-0 REC | #5683 |  |
 | Ottman Azaitar | 2-3-0 UFC | #1806 |  |
 | Owen Jason | 1-0-0 REC | #7584 |  |
 | Ozan Aslaner | 3-2-0 REC | #675 |  |
| Pablo David | 0-1-0 REC | #7549 | |
 | Paddy Pimblett | 7-1-0 UFC | #78 | |
 | Pat Audinwood | 0-2-0 UFC | #5394 |  |
 | Pat Healy | 0-5-0, 1NC UFC | #2851 | |
 | Pat Jones | 0-1-0 REC | #6718 |  |
 | Patricky Pitbull | 1-6-0 REC | #2485 |  |
 | Patrik White | 0-1-0 REC | #7378 | |
 | Paul Creighton | 0-1-0 UFC | #6630 | |
 | Paul Felder | 9-6-0 UFC | #829 | |
 | Paul Hughes | 5-2-0 REC | #1280 |  |