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.
| Jinguan Park | Unknown belt | Cortex MMA |
| JingXian Li | Yellow | De Been 100% Jiu Jitsu |
| Jisha Bhatt | Grey | SJJA Team |
| Jiuzhou Zhao | White | Shibusa |
| Jivananda Gaura | White | Rings MMA Lismore |
| Jivi Ambasana | Grey | SJJA Team |
| Jiwoo Song | White | Revolution Martial Arts Australia |
| JIYAAN ROY | Unknown belt | SJJA PARRAMATTA |
| JJ Ah-Sam | Blue | Studio 55 Brazilian Jiu Jitsu |
| JJ Apiata | White | ROOTS BJJ |
| JJ Chalhoub | White | Bankstown Martial Arts |
| Jo Hann Wee | White | Gracie Barra Pymble |
| Jo Juan-Gardiner | White | Braddah Jiu Jitsu |
| Jo Krause | White | LEGACY |
| Jo Thomson | Black | Gracie Barra Mount Lawley |
| Joah Wilson | Grey | Golden Fox Brazilian Jiu Jitsu |
| Joan Athuil | White | IMPACT AIX-EN-PROVENCE |
| Joana Feyer | Grey | GRACIE BARRA NEWCASTLE CITY |
| Joanna Petrandonakis | Grey | Gracie Barra Carlton |
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