Poids Légers Hommes
 | Omiel Brown | 9-3-0 REC | #555 |  |
 | Ondrej Petrasek | 1-1-0 REC | #6982 |  |
 | Orlando Wilson Prins | 2-4-0 REC | #3350 |  |
 | Oron Kahlon | 0-1-0 REC | #5481 |  |
 | Oscar Mendez | 0-1-0 REC | #5136 |  |
 | Oscar Ownsworth | 2-3-0 REC | #853 | |
 | Osman Minbatirov | 1-1-0 REC | #6057 |  |
 | Ottman Azaitar | 2-3-0 UFC | #1897 |  |
 | Oussama El Idrissi | #8198 | | |
 | Owen Jason | 1-0-0 REC | #7826 |  |
 | Ozan Aslaner | 3-2-0 REC | #1462 |  |
 | Pablo David | 0-1-0 REC | #7998 | |
 | Paddy Pimblett | 8-1-0 UFC | #44 | |
 | Pat Audinwood | 0-2-0 UFC | #5674 |  |
 | Pat Healy | 0-5-0, 1NC UFC | #2962 | |
 | Pat Jones | 0-1-0 REC | #7003 |  |
 | Patrick Ocheme | 3-0-0 REC | #794 |  |
 | Patricky Pitbull | 1-6-0 REC | #2690 |  |
 | Patrik Sebek | 1-1-0 REC | #2456 |  |
 | Patrik White | 0-1-0 REC | #7822 | |