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.
| William Rosen | Blue | TFC - The Fight Centre |
| William Rouse | Grey | Lemos Brazilian Jiu-Jitsu Academy |
| William Rupek | Unknown belt | Will Machado - Comp Team |
| William Ryan | Grey | Gracie Barra Bondi |
| William Said | Grey | MYBJJ TEAM |
| William Sanderson | Grey | Kumite Jiu Jitsu |
| William Santana | Purple | Arena Sunshine Coast - BTT Australia |
| William Schokker | Grey | Phronesis Jiu Jitsu |
| William Scott | White | Garra Brazilian Jiu Jitsu Australia |
| William Shannon | Blue | DCA MMA |
| William Sharp | Grey | SJJA Bulimba |
| William Shaughnessy | Grey | Port Stephens Brazilian JiuJitsu |
| William Simpson | White | SJJA Team |
| William Sinclair | Unknown belt | Harlequin's Brazilian Jiu-Jitsu |
| William Sloan Moncrief | Blue | MAROCCOLO ACADEMY |
| William Smedley | White | Platinum Jiu Jitsu |
| William Smith | Purple | Broz Martial Arts |
| William Smith | Blue | Black Dragon Kai |
| William Snell | White | Bushido Academy |
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