Sorted alphabetically by last name · 2707 fighters
| Name | Nickname | |
|---|---|---|
| RV | Ron van Clief | "The Black Dragon" |
| RJ | Ronald Jhun | "The Machine Gun" |
| RR | Ronaldo Rodriguez | "Lazy Boy" |
| RR | Ronda Rousey | "Rowdy" |
| R | Rongzhu | |
| RL | Ronnie Lawrence | "The Heat" |
| RM | Ronny Markes | |
| RJ | Rony Jason | |
| RT | Ronys Torres | |
| RR | Roosevelt Roberts | "The Predator" |