The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Kane & Lynch (Series) (2 members)
- Kaos Studios (Developer) (1 member)
- Karaoke Revolution (Series) (3 members)
- Kart racing (Genre) (9 members)
- KatGames (Developer) (1 member)
- Keen Games (Developer) (1 member)
- Kemco (Publisher) (2 members)
- Kero Makura (Developer) (1 member)
- Kero Makura (Publisher) (1 member)
- Key (Developer) (3 members)
- Keystone Game Studio (Developer) (1 member)
- Killzone (Series) (3 members)
- King Art Games (Developer) (2 members)
- Kingdom Hearts (Series) (2 members)
- Klei Entertainment (Developer) (3 members)
- Klei Entertainment (Publisher) (1 member)
- Koch Media (Publisher) (4 members)
- Koei Canada (Developer) (1 member)
- Koei Tecmo (Developer) (28 members)
- Koei Tecmo (Publisher) (70 members)