The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- CCP Games (Developer) (1 member)
- CCP Games (Publisher) (1 member)
- CDV Software Entertainment (Publisher) (1 member)
- CI Games (Developer) (1 member)
- CI Games (Publisher) (1 member)
- Cabela's (Series) (11 members)
- Call of Duty (Series) (11 members)
- Call of Juarez (Series) (3 members)
- Camera input: PS Eye (Config) (3 members)
- Camera settings: Qt (Config) (3 members)
- Candygun Games (Developer) (2 members)
- Capcom (Developer) (33 members)
- Capcom (Publisher) (66 members)
- Capybara Games (Developer) (2 members)
- Capybara Games (Publisher) (1 member)
- Card game (Genre) (16 members)
- Castlevania (Series) (4 members)
- Casual Brothers (Developer) (1 member)
- Casual Brothers (Publisher) (1 member)
- Cattle Call (Developer) (1 member)