| Don Contreras | Developer | |
| Don Daglow | Developer | |
| Don Fudge | Developer | |
| Don Herring | Developer | |
| Don Kneller | Developer | |
| Don Laabs | Developer | |
| Don Logan | Developer | |
| Don Moahskarton | Developer | |
| Don Phillip Gibson | Developer | |
| Don Priestley | Developer | |
| Don Weingarden | Developer | |
| Don Whitaker | Developer | |
| Don Worth | Developer | |
| Don't Look Team | Developer | |
| DonForse | Developer | |
| DonPasquale | Developer | |
| DonXuglo Games | Developer | |
| Donald Brown | Developer | |
| Donald Campbell | Developer | |
| Donald L. Granger | Developer | |
| Donald Laabs | Developer | |
| Donald Pavia | DeveloperPublisher | |
| Doneref Studios | Developer | |
| Dongleware Verlags | DeveloperPublisher | |
| Dongleware Verlags GmbH | Developer | |
| Donitz | Developer | |
| Donkeylrp | Developer | |
| Donley Time Foundation | DeveloperPublisher | |
| Donnie G. | Developer | |
| DonnyFromGordonCity | Developer | |
| Donovan Garcia-Buckler | Developer | |
| Donovan W. Foster | Developer | |
| Donpommelo | Developer | |
| Donswelt | Developer | |
| DontComplain | Developer | |
| DontFightDucks | Developer | |
| Dontnod Entertainment | DeveloperPublisher | |
| Donut Studio | Developer | |
| DonutDev | Developer | |
| DonutDuckProducktions | Developer | |
| DonutSecret | Developer | |
| Donutask | Developer | |
| Doodle Cat Games | Developer | |
| DoofusDevelops [AbstractCoastStudios] | Developer | |
| DoogleArt | Developer | |
| DoomBot123 | Developer | |
| DoomCube | Developer | |
| Doombrowski | Developer | |
| Doomcaster | Developer | |
| Doomcube | Developer | |
| Doomgriever | Developer | |
| Doomlaser | Developer | |
| Doomlord Interactive | Developer | |
| DoomsDay652 | Developer | |
| Doomsday Games | Developer | |
| Doomster | DeveloperPublisher | |
| DoonDookStudio | Developer | |
| Doooooom | Developer | |
| Door Jam Studios | Developer | |
| DoorHall | Developer | |
| Doot | Developer | |
| DootNStuff | Developer | |
| Dooyong | Publisher | |
| DopeyTaterChip | Developer | |
| Doppler Interactive | Developer | |
| DopplerFrog | Developer | |
| Doragon Entertainment | DeveloperPublisher | |
| Dorart | DeveloperPublisher | |
| Dorasu | DeveloperPublisher | |
| Dorblin7z7 | Developer | |
| Dordlebuns | Developer | |
| Dorfde | Developer | |
| Dorian SRed | Developer | |
| DorianTan | Developer | |
| DoritoThePug | Developer | |
| Dormir Não Dá XP Studio | Developer | |
| Dorovich | Developer | |
| Dorset Multimedia | DeveloperPublisher | |
| Dorthu | Developer | |
| Dose | Developer | |
| Dosei | Developer | |
| Dot Operator | Developer | |
| Dot Plan | DeveloperPublisher | |
| Dot32 | Developer | |
| DotEmu | DeveloperPublisher | |
| Dotemu | DeveloperPublisher | |
| Dotoyou | Developer | |
| Dotoyou Games | Developer | |
| Dotoyou Technology | Developer | |
| Dotto4213 | Developer | |
| Double Barrel Interractive | Developer | |
| Double Blubber Games (Official) | Developer | |
| Double Brain! | DeveloperPublisher | |
| Double Damage Games | DeveloperPublisher | |
| Double Dash Studios | Developer | |
| Double Diamond Sports | Developer | |
| Double Drive | DeveloperPublisher | |
| Double Eleven | DeveloperPublisher | |
| Double Fine | Developer | |
| Double Fine Productions | DeveloperPublisher | |