The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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)
- LOOT Entertainment (Publisher) (2 members)
- La Voz (Series) (2 members)
- Lancarse (Developer) (1 member)
- Land Ho! (Developer) (1 member)
- Laughing Jackal (Developer) (1 member)