The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Kaiko (Developer) (1 member)
- Kalypso Media (Publisher) (5 members)
- Kamen Rider (Series) (5 members)
- 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)
- Koihime†Musou (Series) (2 members)
- Kojima Productions (Developer) (7 members)
- Konami (Developer) (21 members)
- Konami (Publisher) (78 members)
- Krome Studios (Developer) (4 members)
- Kuju Entertainment (Developer) (1 member)
- Kuju Entertainment (Publisher) (1 member)
- Kung Fu Factory (Developer) (4 members)
- Kung Fu Panda (Series) (3 members)
- Kuno Interactive (Developer) (1 member)
- Kush Games (Developer) (4 members)
- Kylotonn (Developer) (11 members)
- Kyouraku Sangyou Holdings (Developer) (2 members)
- Kyouraku Sangyou Holdings (Publisher) (2 members)
- LEGO (Series) (3 members)
- LOD bias offset: -2 (Config) (1 member)
- LOOT Entertainment (Publisher) (2 members)
- La Voz (Series) (2 members)
- Lancarse (Developer) (1 member)
- Land Ho! (Developer) (1 member)
- Laughing Jackal (Developer) (1 member)
- Laughing Jackal (Publisher) (1 member)
- Le Cortex (Developer) (1 member)
- Le Tour de France (Series) (5 members)
- Leader (Publisher) (1 member)
- Learning With the PooYoos (Series) (2 members)
- Left Field Productions (Developer) (3 members)