Sorted alphabetically by last name · 2707 fighters
| Name | Nickname | |
|---|---|---|
| RM | Roxanne Modafferi | "The Happy Warrior" |
| RN | Roy Nelson | "Big Country" |
| RA | Royce Alger | |
| RG | Royce Gracie | |
| RW | Royston Wee | |
| RP | Ruan Potts | "Fangzz" |
| RM | Rudyard Moncayo | |
| RM | Ruslan Magomedov | "Leopard" |
| RD | Russell Doane | |
| RK | Rustam Khabilov | "Tiger" |