Combattants Etats-Unis
| 2126 |  | Roli Delgado | 1-2-0 UFC | #4832 |  |
| 2127 |  | Roman Faraldo | 2-2-0 REC | #4352 | |
| 2128 |  | Roman Puga | 3-0-0 REC | #705 | |
| 2129 |  | Roman Salazar | 0-2-0, 1NC UFC | #4110 | |
| 2130 |  | Romello Union | 0-1-0 REC | #6866 | |
| 2131 |  | Romero Cotton | 1-2-0 REC | #5771 | |
| 2132 |  | Ron Faircloth | #7721 | | |
| 2133 |  | Ron Humphrey | 2-0-0 REC | #528 | |
| 2134 |  | Ron Stallings | 1-2-0 UFC | #4199 | |
| 2135 |  | Ron Van Clief | 0-1-0 UFC | #4822 | |
| 2136 |  | Ron Waterman | 2-1-1 UFC | #3813 | |
| 2137 |  | Ronald Jhun | 0-1-0 UFC | #7392 | |
| 2138 |  | Ronda Rousey | 6-2-0 UFC | #168 | |
| 2139 |  | Ronnie Gibbs | 1-0-0 REC | #3279 | |
| 2140 |  | Ronnie Lawrence | 2-1-0, 1NC UFC | #3684 | |
| 2141 |  | Ronny Hauser | 0-1-0 REC | #7618 | |
| 2142 |  | Roosevelt Roberts | 4-5-0, 1NC UFC | #1905 | |
| 2143 |  | Rory Light | 1-0-0 REC | #7874 | |
| 2144 |  | Rory Markham | 1-2-0 UFC | #4160 | |
| 2145 |  | Rory Singer | 2-2-0 UFC | #4240 | |
| 2146 |  | Rosario Romero | #8293 | | |
| 2147 |  | Rose Namajunas | 12-7-0 UFC | #65 | |
| 2148 |  | Roxanne Modafferi | 4-8-0 UFC | #2056 | |
| 2149 |  | Roy Nelson | 9-10-0 UFC | #828 | |
| 2150 |  | Royce Alger | 0-2-0 UFC | #5155 | |