Poids Légers Hommes
 | Roman David | 1-0-0 REC | #2648 |  |
 | Roman Mitichyan | 1-1-0 UFC | #4274 |  |
 | Roman Szymanski | 2-4-0 REC | #2093 |  |
 | Roman Zhukov | 0-1-0 REC | #6940 |  |
 | Rongzhu | 4-3-0 UFC | #300 |  |
 | Ronnie Gibbs | 1-0-0 REC | #2856 |  |
 | Ronys Torres | 0-2-0 UFC | #4907 |  |
 | Roosevelt Roberts | 4-5-0, 1NC UFC | #1766 | |
 | Ross Pearson | 12-13-0, 1NC UFC | #670 |  |
 | Rustam Asuev | 1-0-0 REC | #3356 | |
 | Rustam Khabilov | 10-3-0 UFC | #708 | |
 | Ryan Campbell | 3-1-0 REC | #1574 |  |
 | Ryan Couture | 0-2-0 UFC | #4540 | |
 | Ryan Dela Cruz | 0-1-0 REC | #6609 | |
 | Ryan Eren Agbo | 0-2-0 REC | #3581 |  |
 | Ryan Gerena | #8051 | | |
 | Ryan Motley | 1-0-0 REC | #5889 | |
 | Ryan Puttbrese | 1-0-0 REC | #2010 | |
 | Ryan Teixeira | #7682 | | |
 | Ryota Oki | 1-0-0 REC | #2072 |  |