DEVELOPERS
- K Amusement Leasing
- K2
- Kadokawa Shoten
- Kaga Tech
- Kalisto
- Kalisto Entertaiment
- Kalisto Entertainment
- Kalisto Technologies
- Kamui
- Kan's
- Kaneko
- Kaolink
- Karma Studios
- Kaze
- KCE Japan
- KCE Nagoya
- KCE Sapporo
- KCE Shinjuku
- KCE Studios
- KCE Yokohama
- KCEA
- KCEJ
- KCEK
- KCEO
- KCET
- KCET Bemani
- KEJ
- Kemco
- Keynet
- Khaos
- Kid
- KID Corporation
- Kiddinx
- Kids Revolution
- KIDSMIND
- Killer Game
- King of the Jungle
- King of the Jungle Ltd
- King Records
- Kinotrope
- Kirat
- Kiss
- Kita Denshi
- Kitty Group
- Klein Computer Entertainment
- Klon Co., Ltd.
- KnowWonder
- KnowWonder Digital Mediaworks
- Kobi Group
- Kodansha
- Kodiak Interactive
- Kodiak Interactive Software Studios
- Koei
- Koei Co., Ltd
- Koei/Inis
- Koga Game Factory
- Kogado Studio
- Kojima Productions
- Kokopeli Digital Studios
- Konami
- Konami Computer Entertainment Chicago
- Konami Computer Entertainment Hawaii
- Konami Computer Entertainment Nagoya
- Konami Computer Entertainment Osaka
- Konami Computer Entertainment Osaka (KCEO)
- Konami Computer Entertainment Shinjuku
- Konami Computer Entertainment Tokyo, Inc
- Konami Computer Entertainment Tokyo (KCET)
- Konami Computer Games Seizan (KCGS)
- Konami / Diamond Head
- Kool Kizz
- Koto Laboratory / Yoshidayama Workshop / Tose Software
- Kotobuki System
- Kotobuki System Co., Ltd
- Kotobuki Systems
- Kouyousha
- Kowloons Gate Project
- Krea Medie A/S
- Krisalis Software
- Krisalis Software Ltd
- Krisalis Software Ltd. / Key Game
- Krisalis Software Ltd / The Bitmap Brothers
- Kritzelkratz
- Krome Studios
- Kronos Digital Entertaiment
- Kronos Digital Entertainment
- Kronos Digital Entertainment, Inc.
- KSS
- Kung Fu
- Kung Fu Games
- Kure
- Kure Software Koubou
- Kuusou Kagaku
- Kyugo Boueki