| Orbital Media
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| O-Two
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| Octagon Entertainment
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| OPeNBooK
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| ODENIS Studios
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| OeRSTED
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| Opera House
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| Ornith
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| oeFun
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| O3 Entertainment
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| Oracion
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| Odyssey Software
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| Oz Club
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| Ongakukan
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| Omega Products
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| Obsidian
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| Office Create
|
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| Office Koukan
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| Otaboo
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| Omega Force
|
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| Ocean
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| Other Ocean Interactive
|
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| Omega Micott
|
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| Ocarina-System
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| Onion Egg
|
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| Omiya Soft
|
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| Octagon Music
|
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| On Demand
|
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| Overmax Studios
| http://www.o-works.co.jp
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| O~3 Entertainment
| http://www.o3entertainment.com/
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| Oddworld Inhabitants
| http://www.oddworld.com/
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| Oldergames.com
| http://www.oldergames.com
|
| Omega Training Group, Inc.
| http://www.omegatraining.com/
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| Onkio Haus
| http://www.onkio.co.jp
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| Opera
| http://www.opera.com
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| Opera Software
| http://www.opera.com/
|
| Opus
| http://www.opus.co.jp/
|
| Orbit Soft
| http://www.orbit-soft.com
|
| Origin Systems
| http://www.origin.ea.com
|
| Osiris Studios
| http://www.osirisstudios.com
|
| OutLook Entertainment
| http://www.outlookentertainment.com
|
| Outrage
| http://www.outrage.com
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| Oxygen Interactive
| http://www.oxygenint.com
|
| Overworks
| http://www.sega.com
|