Poids Mi-Moyens Hommes
 | Nikola Joksovic | 4-0-0, 1NC REC | #1907 |  |
 | Nikolay Aleksakhin | 2-4-0, 1NC REC | #1129 |  |
 | Nikolay Veretennikov | 2-4-0 UFC | #840 |  |
 | Noah Lindsey | 0-1-0 REC | #7344 |  |
 | Nordine Taleb | 7-5-0 UFC | #929 |  |
 | O. Mandt Johnsen | 0-1-0 REC | #7916 |  |
 | Oban Elliott | 3-2-0 UFC | #1348 |  |
 | Oganes Voskanyan | 1-2-0 REC | #2360 | |
 | Oleg Dadonov | 1-1-0 REC | #1869 | |
 | Olendet Apouassa Romeo | 0-1-0 REC | #5750 |  |
 | Oliver Enkamp | 0-2-0 UFC | #3767 |  |
 | Olivier Fleurmon | 1-0-0 REC | #1993 | |
 | Olli Santalahti | 2-3-0 REC | #3485 |  |
 | Omar El Dafrawy | 5-1-0 REC | #659 |  |
 | Omar Hussein | 1-2-0 REC | #3749 |  |
 | Omar Santana | 0-1-0 REC | #7303 |  |
 | Omari Akhmedov | 9-5-1 UFC | #576 | |
 | Omoyele Gonzalez | 0-1-0 REC | #5782 | |
 | Omran Chaaban | 3-0-0 REC | #986 | |
 | Orion Cosce | 1-2-0 UFC | #3979 | |