People who have competed at Australian Brazilian jiu-jitsu and grappling events. Australia only, for now.
| Siobhan Back | Purple | Chave De Ouro |
| Siobhan Kehoe | Blue | EQUIPE MESTRE WILSON JIU-JITSU AUSTRALIA |
| Sion Saulwick | Grey | TA | BYRON BAY |
| Sione Sika | Blue | Camden Valley Wrestling |
| Sione Sisifa | White | Absolute MMA |
| Siosiana Tangulu | White | Gracie Barra Morisset |
| Siraj Othman | Unknown belt | Fusion Fight and Fitness |
| Siraj Soufi | Black | Absolute MMA |
| Sirius Sedhom | Grey | IFA Martial Arts |
| Sisi Lim | Blue | Phoenix BJJ NZ |
| SiSi Travers | Unknown belt | De Been 100% Jiu Jitsu |
| Sitivi Pulepule | White | Galeb BJJ |
| SJ Little-Link | Grey | Base Training Centre |
| Sjouke Eyre | White | Eltham Martial Arts Academy |
| Skarlett Quera | Grey | Gracie Barra Edgeworth |
| Skarlotte Aviu | Unknown belt | Complete Mixed Martial Arts |
| Skye Bryant | Purple | Parramatta Jiu Jitsu Academy |
| Skye Cabrera | Grey | SJJA Team |
| Skye Cranston | White | Fight World Australia |
Wave