The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Coresoft (Developer) (1 member)
- Costume Quest (Series) (2 members)
- Covers (822 members)
- Crafts & Meister (Developer) (3 members)
- Crash Time (Series) (2 members)
- Crave Entertainment (Publisher) (4 members)
- Creat Studios (Developer) (16 members)
- Creat Studios (Publisher) (10 members)
- Creative Assembly (Developer) (4 members)
- Creative Vault Studios (Developer) (1 member)
- Crispy's! (Developer) (1 member)
- Crispy's (Developer) (1 member)
- Criterion Games (Developer) (4 members)
- Crocodile Entertainment (Developer) (1 member)
- Crocodile Entertainment (Publisher) (1 member)
- Croteam (Developer) (1 member)
- Crunching Koalas (Developer) (1 member)
- Crypton (Developer) (5 members)
- Crysis (Series) (3 members)
- Crystal Dynamics (Developer) (3 members)