People who have competed at Australian Brazilian jiu-jitsu and grappling events. Australia only, for now. See Australian BJJ rankings for recorded wins by belt, state, and ruleset.
| Oisin Yeoh | Grey | LEGACY |
| Oka Brundle | Grey | The Agoge Brazilian Jiu-Jitsu |
| Okko De Maine | Unknown belt | CAZA BJJ Australia |
| Oksana Barozzi | Blue | Arte Suave Brazilian Jiu Jitsu |
| Oleg Smirnov | White | Guardians Gym |
| Oleh Povorozniuk | Blue | The Grappling Club |
| Oleiria Pease | Yellow | Portal Brazilian Jiu Jitsu |
| Oleksandr Kovalchuk | White | Cia Paulista Australia |
| Oleta F | Grey | Melbourne Jiu -Jitsu Academy |
| Oli Galea | White | DNA MMA |
| Oli Pitts | Unknown belt | Nova Arte Brazilian Jiu Jitsu |
| Oli Rossetti | White | No team/association18Jan |
| Olito Lokondo | Unknown belt | Bankstown Martial Arts |
| Olive Constable | White | Geraldton BJJ |
| Olive Dunne | Grey | SJJA Team |
| Olive Kirk | Unknown belt | THE LAB JIU JITSU SCHOOL AUSTRALIA |
| Olive Lopez | Grey | Coringa Jiu-Jitsu |
| Olive Osbourne | Grey | Gracie Barra Tweed Heads |
| Olive Tokong | Grey | BYRON BAY MMA |
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