Tous les combattants
 | Roosevelt Roberts | 4-5-0, 1NC UFC | #1662 |  |
 | Roque Conceicao | 0-1-0 REC | #5155 |  |
 | Roque Martinez | 0-3-0 UFC | #4320 |  |
 | Rory Evans | 2-5-0 REC | #3281 |  |
 | Rory Light | 1-0-0 REC | #7247 | |
 | Rory MacDonald | 9-4-0 UFC | #538 |  |
 | Rory Markham | 1-2-0 UFC | #3765 | |
 | Rory Singer | 2-2-0 UFC | #3829 | |
 | Rose Conceicao | 0-2-0 REC | #3925 | |
 | Rose Namajunas | 12-7-0 UFC | #72 | |
 | Rosi Sexton | 0-2-0 UFC | #4293 |  |
 | Ross Houston | #7264 |  | |
 | Ross Pearson | 12-13-0, 1NC UFC | #666 | |
 | Ross Pointon | 0-2-0 UFC | #4473 | |
 | Rostem Akman | 0-2-0 UFC | #3472 |  |
 | Rousimar Palhares | 8-4-0 UFC | #1084 | |
 | Roxanne Modafferi | 4-8-0 UFC | #1956 | |
 | Roy Nelson | 9-10-0 UFC | #789 | |
 | Roybert Echeverria | 0-1-0 REC | #6371 |  |
 | Royce Alger | 0-2-0 UFC | #4635 | |
 | Royce Gracie | 11-1-1 UFC | #416 | |
 | Royston Wee | 2-1-0 UFC | #3643 |  |
 | Roza Gumienna | 1-3-0 REC | #4186 |  |
 | Ruan Miqueias | #7490 | | |
 | Ruan Potts | 0-3-0 UFC | #4196 |  |