The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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)
- Cauldron (Developer) (7 members)
- Cauldron HQ (Developer) (3 members)
- Cave (Developer) (1 member)
- Cavia (Developer) (3 members)
- Cellar Door Games (Developer) (1 member)
- Cellar Door Games (Publisher) (1 member)
- Cellius (Developer) (1 member)
- Certain Affinity (Developer) (1 member)
- Cherry Pop Games (Developer) (1 member)
- Cherry Pop Games (Publisher) (1 member)