Jotai Kougaku Kenkyuusho
| http://www.nyoken.com/
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JV Games
| http://www.jvgames.com
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Jupiter
| http://www.jupiter.co.jp
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Jester Interactive
| http://www.jesterinteractive.co.uk
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Jellyvision
| http://www.jellyvision.com
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JCS Studio
| http://www.jcstudiofitness.com/
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JC Research
| http://www.jcresearch.com
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Jane's Combat Simulations
| http://www.janes.ea.com
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Jaleco
| http://www.jaleco.com
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Jya no Michi wa Hebi Soft
| http://www.jado-soft.com
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Jim Henson Company
| http://www.henson.com/
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John Dondzila
| http://www.classicgamecreations.com
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JMD
| http://jm1200.ifrance.com/jm1200/
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Jiyukokuminsha
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JAM
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Japan DataWorks
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J-Force
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Japan Vistec
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Japan Amusement Broadcasting
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JSH
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J.S.C. Gamos
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Joy Van
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Jeff Tunnell Productions
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JISC Life Support
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Jupter
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JTB West
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JapanStudio
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Jupiter Corporation
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Jet Black Games
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Jupiter Multimedia
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Japan Media Programming
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Jorudan
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JGI Entertainment
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Japan Art Media
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Jarhead Games
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Juice Games
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Jack Pot
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Jinx
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Jordan
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J-Wing
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Jordan Pinsker
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Jack of All Games
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Just Add Monsters
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Jowood Productions
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JVC
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Japan System Supply
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