People who have competed at Australian events. Australia only, for now.
| Isaiah Black | Blue | Complete Mixed Martial Arts |
| Isaiah Hanna | White | Gracie Barra Carlton |
| Isaiah Kevorkian | Grey | Gracie Barra Sydney |
| Isaiah Osman | Grey | The Grappling Lab Prestons |
| Isaiah Paul-Nguyen | Grey | GCJ Academy |
| Isaiah Prinsloo | White | Ako Martial Arts |
| Isaiah Psarros | Grey | M16/Beachside Jiu-Jitsu |
| Isak Ivanovic | Brown | Absolute MMA |
| Isaque Yassen Yassen | Grey | High Rollers |
| Ish USTUNDAG | Blue | DC AUSTRALIA |
| Ishana Patel | Grey | ATI Martial Arts |
| Ishaq Moussa | Grey | Phoenix Martial Arts Australia Pty Ltd |
| Isi Kioa | White | SJJA Team |
| Isiah Filipovic | Grey | De Been 100% Jiu Jitsu |
| Isiah Hannoun | Grey | Gracie Barra Carlton |
| Isiah McLennan | Grey | Fight Club Jiu-Jitsu team |
| Isla Broadhead | White | Insight Jiu Jitsu Academy |
| Isla Chetty | Grey | Will Machado - Comp Team · Concept Jiu Jitsu |
| Isla Crozier | Grey | Team Sparta |
Wave