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.
| Sienna Lawler | White | Fight Club Jiu-Jitsu team |
| Sienna Lemmey | White | ISOHEALTH |
| Sienna Mendoza | Grey | Australian Elite Team |
| Sienna Pellizzaro | Grey | Martial Arts Spirit |
| Sienna Regan | Grey | VICE Jiu Jitsu |
| Sienna Roberts | Grey | SJJA Team |
| Siera Christie | Grey | Gracie Barra Carlton |
| Sierra Parker | Unknown belt | Southern Stars Taekwondo |
| Sierra Spagnol | Grey | Galeb BJJ |
| Sierra Stockton | White | Fight Club Jiu-Jitsu team |
| Sifa Pole | White | OnePurpose |
| Siggi Hogg | Blue | Team Lead |
| Sigi Huber | White | Team Perosh MMA |
| Sihwan Jin | White | Cia Paulista Australia |
| Sihyun Lee | Grey | Cia Paulista Australia |
| Siina Suominen | Blue | LEGACY |
| Silas Bartholomew | Unknown belt | Escape Jiu Jitsu |
| Silas Beryson | Grey | De Been 100% Jiu Jitsu |
| Silas McBride | Grey | Gracie Barra Burleigh Heads |
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