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