Sorted alphabetically by last name · 2715 fighters
| Name | Nickname | |
|---|---|---|
| IL | Ilir Latifi | "The Sledgehammer" |
| IR | Imanol Rodriguez | "Himan" |
| IK | Impa Kasanganay | "Tshilobo" |
| IC | Ion Cutelaba | "The Hulk" |
| IA | Irene Aldana | |
| IA | Irina Alekseeva | "Russian Ronda" |
| IR | Irwin Rivera | "The Beast" |
| ID | Isaac Dulgarian | "The Midwest Choppa" |
| IT | Isaac Thomson | |
| IV | Isaac Vallie-Flagg |