People who have competed at Australian events. Australia only, for now.
| Isla Muir | Grey | DCA MMA |
| Isla Santos | Grey | Gracie Barra Tweed Heads |
| Isla Snowden | Unknown belt | Flux Jiu Jitsu |
| Isla Standen | Grey | Flux Jiu Jitsu |
| Isla Taveras | Unknown belt | Mackay MMA |
| Isla-Rose Phillips | White | Randori Jiu Jitsu Australia |
| Isley Phillips | Grey | Unity BJJ AUST |
| Ismaeel Ally | White | SOUTHSIDE BRAZILIAN JIU-JITSU OFFICIAL |
| Ismael Naseraldin | White | Complete Mixed Martial Arts |
| Ismail Elcheikh | Blue | Team Australia |
| Ismail Selman | Grey | Gracie Barra Mount Lawley |
| Isobel Lerpiniere | White | TRINITY Australia |
| Israel Hyde | Black | Evolve Brazilian Jiu Jitsu |
| Israel Lima Reis | Grey | SJJA Team |
| Issa Darwich | White | Bankstown Martial Arts |
| Issa El Hayek | Grey | Sydney Wrestling Academy |
| Issa Hassan | White | Nexus Jiu-Jitsu & MMA |
| Issa Issa | Unknown belt | Sydney Wrestling Academy |
| Issa Korda-Mehkari | White | Ironfist gym |
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