| 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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