Sorted alphabetically by last name · 2765 fighters
| Name | Nickname | |
|---|---|---|
| SP | Steven Peterson | "Ocho" |
| SS | Steven Siler | "Super" |
| SL | Stevie Lynch | |
| SR | Stevie Ray | "Braveheart" |
| SN | Stewart Nicoll | "Kakamora" |
| SM | Stipe Miocic | |
| SY | SuYoung You | "Yoo-Jitsu" |
| S | Sulangrangbo |
| SA | Sultan Aliev |
| SM | Suman Mokhtarian |