Poids Légers Hommes
 | Orlando Wilson Prins | 2-4-0 REC | #3326 |  |
 | Oron Kahlon | 0-1-0 REC | #5603 |  |
 | Oscar Mendez | 0-1-0 REC | #5141 |  |
 | Oscar Ownsworth | 2-3-0 REC | #799 |  |
 | Osman Minbatirov | 1-1-0 REC | #6029 |  |
 | Ottman Azaitar | 2-3-0 UFC | #1885 |  |
 | Oussama El Idrissi | #8248 | | |
 | Owen Jason | 1-0-0 REC | #7828 |  |
 | Ozan Aslaner | 3-2-0 REC | #1416 |  |
 | Pablo David | 0-1-0 REC | #7970 | |
 | Paddy Pimblett | 8-1-0 UFC | #37 | |
 | Pat Audinwood | 0-2-0 UFC | #5621 |  |
 | Pat Healy | 0-5-0, 1NC UFC | #2953 | |
 | Pat Jones | 0-1-0 REC | #6992 |  |
 | Patrick Ocheme | 3-0-0 REC | #754 |  |
 | Patricky Pitbull | 1-6-0 REC | #2688 |  |
 | Patrik Sebek | 1-1-0 REC | #2420 |  |
 | Patrik White | 0-1-0 REC | #7810 | |
 | Paul Creighton | 0-1-0 UFC | #7169 | |
 | Paul Felder | 9-6-0 UFC | #840 | |