The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Sandbox (Genre) (7 members)
- Sandlot (Developer) (1 member)
- Sangoku Hime (Series) (1 member)
- Sangokushi (Series) (2 members)
- Sanuk Games (Publisher) (1 member)
- Sanzaru Games (Developer) (3 members)
- Sarbakan (Developer) (1 member)
- Saurus (Developer) (1 member)
- Saw (Series) (2 members)
- Scene It? (Series) (2 members)
- Schlag den Raab (Series) (2 members)
- Science Adventure (Series) (8 members)
- Scientifically Proven (Developer) (1 member)
- Scientifically Proven (Publisher) (1 member)
- Seaven Studio (Developer) (1 member)
- Seaven Studio (Publisher) (1 member)
- Secret Level (Developer) (3 members)
- Section 8 (Series) (2 members)
- Seed Studios (Developer) (1 member)
- Sega (Developer) (25 members)
- Sega (Publisher) (108 members)
- Sega AM2 (Developer) (1 member)
- Sega AM3 (Developer) (2 members)
- Sega Racing Studio (Developer) (1 member)
- Sega Rally (Series) (1 member)
- Sega Studios Australia (Developer) (1 member)
- Sega Technical Institute (Developer) (1 member)
- Semanoor International (Publisher) (1 member)
- Semaphore (Developer) (1 member)
- Sengoku Basara (Series) (4 members)
- Sengoku Hime (Series) (4 members)
- Series (265 members)
- Serious Parody (Developer) (1 member)
- Serious Parody (Publisher) (1 member)
- Seven45 Studios (Developer) (1 member)
- Seven45 Studios (Publisher) (1 member)
- 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) (5 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) (1,471 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) (19 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)
- Snowblind Studios (Developer) (1 member)
- Snowboarding (Genre) (2 members)
- Social simulation (Genre) (2 members)
- Soedesco (Publisher) (1 member)
- Soldner-X (Series) (2 members)
- Sonic Team (Developer) (8 members)
- Sonic Team USA (Developer) (1 member)
- Sonic the Hedgehog (Series) (12 members)
- Sony Computer Entertainment (Publisher) (249 members)
- Sony Online Entertainment (Developer) (4 members)
- Sony Online Entertainment (Publisher) (24 members)
- SoulCalibur (Series) (4 members)
- Souls (Series) (3 members)
- SouthPeak Games (Publisher) (3 members)