The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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)
- Chunsoft (Developer) (1 member)
- Chunsoft (Publisher) (1 member)
- Cipher Prime (Developer) (2 members)
- Cipher Prime (Publisher) (1 member)
- City Interactive (Developer) (5 members)
- City Interactive (Publisher) (5 members)
- Clap Hanz (Developer) (3 members)
- Class of Heroes (Series) (2 members)
- ClassiC Shikoukairo (Developer) (1 member)
- Clever Beans (Developer) (1 member)
- Climax Studios (Developer) (2 members)