Poids Mi-Moyens Hommes
 | Orion Cosce | 1-2-0 UFC | #3694 |  |
 | Orlando Sanders | 0-1-0 REC | #6981 | |
 | Orlando Wiet | 1-1-0 UFC | #3073 |  |
 | Oseyiomon Oiyemhonlan | 1-2-0 REC | #4269 | |
 | Oskar Staszczak | 1-0-0 REC | #1651 |  |
 | Oskar Szczepaniak | 4-2-0 REC | #2608 | |
 | Osvaldo Benedito | 0-1-0 REC | #5148 |  |
 | Oton Jasse | 0-3-0 REC | #3758 |  |
 | Oualy Tandia | #5115 | | |
 | Ovidio Bojorquez | 0-1-0 REC | #6594 |  |
 | Paddy Wilkinson | 0-1-0 REC | #6820 |  |
 | Papy Abedi | 1-3-0 UFC | #3344 |  |
 | Pascal Krauss | 2-2-0 UFC | #3166 |  |
 | Pat Miletich | 8-2-0 UFC | #300 | |
 | Pat Pytlik | 0-1-0 REC | #5909 |  |
 | Patrice Evra | #3596 | | |
 | Patrick Cote | 10-11-0 UFC | #799 | |
 | Patrick Habirora | 5-0-0 REC | #452 |  |
 | Patrik Celic | 0-1-0 REC | #6326 |  |
 | Patrik Sebek | 1-0-0 REC | #1774 |  |