| Name | Types | |
|---|---|---|
| 3 Sprockets | Developer | |
| 3-Fold Games | Developer | |
| 30 | Developer | |
| 3000 AD | Developer | |
| 3000AD | DeveloperPublisher | |
| 302 Studios | Developer | |
| 314programs | Developer | |
| 343 Industries | Developer | |
| 343i | Developer | |
| 345 Games | Publisher | |
| 34BigThings | DeveloperPublisher | |
| 351n | Developer | |
| 360 Pacific | DeveloperPublisher | |
| 369 Interactive | Developer | |
| 38 Studios | Developer | |
| 38,9_Degrees | Developer | |
| 39 Steps | Publisher | |
| 3909 | DeveloperPublisher | |
| 3D Avenue | Developer | |
| 3D Clouds | Developer | |
| 3D Lights | Developer | |
| 3D Methods | Developer | |
| 3D People | Developer | |
| 3D Realms | DeveloperPublisher | |
| 3D Realms Entertainment | DeveloperPublisher | |
| 3D2Entertainment | Developer | |
| 3DClouds | Developer | |
| 3DI70R | Developer | |
| 3DO | DeveloperPublisher | |
| 3DO Company | Publisher | |
| 3DOEU,NA | Publisher | |
| 3DONA | Publisher | |
| 3DONA,EU | Publisher | |
| 3Division | Developer | |
| 3Division Entertainment | DeveloperPublisher | |
| 3Force | Developer | |
| 3G Studios | Developer | |
| 3MinuteFlips | Developer | |
| 3RatMoon | Developer | |
| 3StrakGames | Developer | |
| 3TE Games | Developer | |
| 3Vision Games | Developer | |
| 3amStudios | Developer | |
| 3amsoda | Developer | |
| 3boood_pro | Developer | |
| 3bytes | Developer | |
| 3d6 Games | Developer | |
| 3d8Studios | Developer | |
| 3djon | Developer | |
| 3ichael7ambert | Developer |