Poids Légers Hommes
 | Nobumitsu Osawa | 0-1-0 REC | #6583 |  |
 | Noe Dellachi | 1-0-0 REC | #1591 |  |
 | Nonato Junior | 0-2-0 REC | #3939 |  |
 | Norman Parke | 5-3-1 UFC | #2159 |  |
 | Nurkhan Zhumagazy | 1-0-0 REC | #1400 |  |
 | Nursultan Jumadilde | 0-1-0 REC | #6867 |  |
 | Nurullo Aliev | 3-0-0 UFC | #932 |  |
 | Ognjen Dimic | 0-3-0 REC | #3018 |  |
 | Oleksandr Moisa | 2-1-0 REC | #260 |  |
 | Olivier Aubin-Mercier | 7-5-0 UFC | #175 |  |
 | Omar Morales | 3-4-0 UFC | #2326 |  |
 | Omar Reguigui | 0-1-0, 1NC REC | #4472 |  |
 | Omar Tugarev | 0-2-0 REC | #3798 |  |
 | Omiel Brown | 9-2-0 REC | #155 |  |
 | Ondrej Petrasek | 1-1-0 REC | #6108 |  |
 | Orlando Wilson Prins | 2-4-0 REC | #2829 |  |
 | Oron Kahlon | 0-1-0 REC | #5275 |  |
 | Oscar Mendez | 0-1-0 REC | #5180 |  |
 | Oscar Ownsworth | 1-3-0 REC | #3198 | |
 | Osman Minbatirov | 1-1-0 REC | #5536 |  |