Poids Mi-Moyens Hommes
 | Orion Cosce | 1-2-0 UFC | #3870 |  |
 | Orlando Sanders | 0-1-0 REC | #7580 | |
 | Orlando Wiet | 1-1-0 UFC | #3143 |  |
 | Oseyiomon Oiyemhonlan | 1-2-0 REC | #4783 | |
 | Oskar Staszczak | 1-0-0 REC | #2488 |  |
 | Oskar Szczepaniak | 4-2-0 REC | #3000 | |
 | Osvaldo Benedito | 0-1-0 REC | #5210 |  |
 | Oton Jasse | 0-3-0 REC | #4337 |  |
 | Oualy Tandia | 1-0-0 REC | #788 | |
 | Ousmane Camara | 1-0-0 REC | #1392 | |
 | Ovidio Bojorquez | 0-1-0 REC | #7017 |  |
 | Paddy Wilkinson | 0-1-0 REC | #6381 |  |
 | Papy Abedi | 1-3-0 UFC | #3713 |  |
 | Pascal Krauss | 2-2-0 UFC | #3430 |  |
 | Pat Miletich | 8-2-0 UFC | #343 | |
 | Pat Pytlik | 0-1-0 REC | #6475 |  |
 | Patrice Evra | #3057 | | |
 | Patrick Cote | 10-11-0 UFC | #870 | |
 | Patrick Habirora | 6-0-0 REC | #356 |  |
 | Patrick Rivera | #8131 | |