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.
| Orin Mitford | Grey | DOMINANCE |
| Orin Mitford Mitford | Unknown belt | DOMINANCE |
| Orion Carr | Grey | Gracie Barra Liverpool |
| Orion Cooper | White | SJJA Team |
| Orla Harmer | Unknown belt | The Jiu-Jitsu Studio Darwin |
| Orlando Atkins | White | SJJA Prestons |
| Orlando Barisic | Grey | Virtue Brazilian Jiu-Jitsu Australia |
| Orlando Bellinfante Junior | White | Gracie Barra St Peters Australia |
| Orlando Broughton | Grey | Ortiz Martial Arts Academy |
| Orlando Brown | Yellow | Grappling Bros / GFTeam |
| Orlando Cecchi | White | Gracie Barra Mount Lawley |
| Orlando Clissold | Grey | Gracie Barra Mount Lawley |
| Orlando Cutajar | Grey | Rise MMA |
| Orlando Dei Agnoli | Grey | SOUTHSIDE BRAZILIAN JIU-JITSU OFFICIAL |
| Orlando Dunbar Afamasaga | White | HUIA MARTIAL ARTS |
| Orlando Faitau | White | Global Martial Arts AU |
| Orlando Hill | White | Matrix Gym Australia |
| Orlando Mafi | Grey | Legends Brazilian Jiu Jitsu Australia |
| Orlando Matta | White | Fight Club Jiu-Jitsu team |
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