Sorted alphabetically by last name · 2769 fighters
| Name | Nickname | |
|---|---|---|
| RR | Ricardo Ramos | |
| RR | Ricardo Romero | |
| RR | Ricco Rodriguez | "Suave" |
| RA | Rich Attonito | "The Raging Bull" |
| RC | Rich Clementi | "No Love" |
| RF | Rich Franklin | "Ace" |
| RC | Richard Crunkilton | "Cleat" |
| RW |
| Richard Walsh |
| "Filthy Rich" |
| RM | Richardson Moreira | "Rick Monstro" |
| RH | Richie Hightower | "The Dirty Samurai" |