The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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) (2 members)
- Sega Rally (Series) (2 members)
- 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 (266 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) (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)