Sorted alphabetically by last name · 2775 fighters
| Name | Nickname | |
|---|---|---|
| RM | Rory Markham | |
| RS | Rory Singer | "Outburst" |
| RN | Rose Namajunas | "Thug" |
| RS | Rosi Sexton | "The Surgeon" |
| RP | Ross Pearson | "The Real Deal" |
| RP | Ross Pointon | "The Gladiator" |
| RA | Rostem Akman | |
| RP |
| "Toquinho" |
| RM | Roxanne Modafferi | "The Happy Warrior" |
| RN | Roy Nelson | "Big Country" |