The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- SevenOne Intermedia (Developer) (1 member)
- SevenOne Intermedia (Publisher) (1 member)
- Shaba Games (Developer) (1 member)
- Shader mode: Async with Shader Interpreter (Config) (2 members)
- Shader mode: Legacy (singlethreaded) (Config) (6 members)
- Shader mode: Shader Interpreter only (Config) (1 member)
- Shader quality: High (Config) (4 members)
- Shader quality: Low (Config) (1 member)
- Shank (Series) (2 members)
- Shin Hayarigami (Series) (2 members)
- Shindenken (Developer) (1 member)
- Shining (Series) (1 member)
- Shiny Entertainment (Developer) (1 member)
- Shoot 'em up (Genre) (41 members)
- Shooter (Genre) (41 members)
- Side-scroller (Genre) (3 members)
- SideQuest Studios (Developer) (4 members)
- Sideline Amusements (Developer) (1 member)
- Sidhe (Developer) (5 members)
- Sidhe (Publisher) (1 member)
- Sidhe Interactive (Developer) (1 member)
- Sierra Entertainment (Publisher) (1 member)
- Sigma Team (Developer) (1 member)
- Silence all logs: On (Config) (2 members)
- Silent Hill (Series) (3 members)
- Silicon Knights (Developer) (1 member)
- Silicon Studio (Developer) (2 members)
- SilverStar (Developer) (2 members)
- SilverStar (Publisher) (3 members)
- Silverball Studios (Developer) (1 member)
- Simulation (Genre) (16 members)
- SingStar (Series) (28 members)
- Single-player (Game mode) (1,475 members)
- Size Five Games (Developer) (1 member)
- Skate (Series) (3 members)
- SkyFallen Entertainment (Developer) (1 member)
- Skylanders (Series) (6 members)
- Slang (Publisher) (1 member)
- Slant Six Games (Developer) (3 members)
- Sledgehammer Games (Developer) (2 members)
- Sleep timers accuracy: As Host (Config) (24 members)
- Sleep timers accuracy: Usleep Only (Config) (1 member)
- Slightly Mad Studios (Developer) (3 members)
- Slitherine (Developer) (1 member)
- Slitherine (Publisher) (1 member)
- Sly Cooper (Series) (3 members)
- SmackDown vs. Raw (Series) (8 members)
- Smartphone Labs LLC (Publisher) (1 member)
- Sniper: Ghost Warrior (Series) (2 members)
- Sniper Elite (Series) (2 members)