Sorted alphabetically by last name · 2778 fighters
| Name | Nickname | |
|---|---|---|
| SM | Sergio Moraes | "The Panther" |
| SP | Sergio Pettis | |
| SS | Serhiy Sidey | |
| SB | Seth Baczynski | "The Polish Pistola" |
| SP | Seth Petruzelli | "The Silverback" |
| SC | SeungGuk Choi | |
| SC | SeungWoo Choi | "Sting" |
| SB |
| SA | Shamil Abdurakhimov | "Abrek" |
| SG | Shamil Gamzatov |