Sorted alphabetically by last name · 2769 fighters
| Name | Nickname | |
|---|---|---|
| RS | Ron Stallings | "The Choir Boy" |
| RW | Ron Waterman | "H20" |
| RV | Ron van Clief | "The Black Dragon" |
| RJ | Ronald Jhun | "The Machine Gun" |
| RR | Ronaldo Rodriguez | "Lazy Boy" |
| RR | Ronda Rousey | "Rowdy" |
| R | Rongzhu | "The Yama King" |
| RL |
| Ronnie Lawrence |
| "The Heat" |
| RM | Ronny Markes |
| RJ | Rony Jason |