The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Strange Loop Games (Developer) (1 member)
- Strategy (Genre) (60 members)
- Strawdog Studios (Developer) (1 member)
- Street Fighter (Series) (5 members)
- Strict rendering mode: On (Config) (13 members)
- Studio Saizensen (Developer) (1 member)
- Sucker Punch Productions (Developer) (4 members)
- Sullivan Bluth Interactive (Developer) (1 member)
- Sumo Digital (Developer) (12 members)
- Sunsoft (Publisher) (1 member)
- SuperBot Entertainment (Developer) (1 member)
- SuperVillain Studios (Developer) (2 members)
- Super Robot Wars (Series) (7 members)
- Super X Studios (Developer) (1 member)
- Superbike World Championship (Series) (3 members)
- Superflat Games (Developer) (1 member)
- Supermassive Games (Developer) (8 members)
- Supersonic Software (Developer) (1 member)
- Survival (Genre) (4 members)
- Survival horror (Genre) (37 members)