| Dogfire Games | Developer | |
| Dogiel | Developer | |
| Dogmelon Games | DeveloperPublisher | |
| Dogs In Tanks | Developer | |
| Dogtagyourd | Developer | |
| Dogtok | Developer | |
| Dogtopius | Developer | |
| Doinksoft | Developer | |
| Dois Mundos | Developer | |
| Doka | Developer | |
| Doka (Peter Balla, Imre Kovats, Ildiko Somos, Dan Guerra, Jody Sather, Matt Carlstrom) | Developer | |
| Doki Denki | Developer | |
| Doki Denki Studio | Developer | |
| DokiDenki Studio | Developer | |
| DokiDev | Developer | |
| Doktor Plekter | Developer | |
| Dollar Games | Developer | |
| Dolleman | Developer | |
| Dolores Entertainment | DeveloperPublisher | |
| Dom Camus | Developer | |
| Dom Early | Developer | |
| Dom Liotti | Developer | |
| Dom's Games | Developer | |
| Dom+Nat | Developer | |
| DomBeE | Developer | |
| DomDev | Developer | |
| DomDev1 | Developer | |
| Domarius Games | Developer | |
| Domark | DeveloperPublisher | |
| Domark EU | Publisher | |
| Domark, Incentive Software | DeveloperPublisher | |
| DomarkPAL | Publisher | |
| Dome Software | Developer | |
| DomedVortex | Developer | |
| Dominaxis Games | Developer | |
| Dominic Robinson | Developer | |
| Dominic Wood | Developer | |
| DominicPrimeYT | Developer | |
| DominickTamras | Developer | |
| Dominik Lussier-Marcotte | Developer | |
| Dominik Madarász | Developer | |
| Dominique Grieshofer | DeveloperPublisher | |
| Domo.o | Developer | |
| Domo76 | Developer | |
| Domos | Developer | |
| Dompa Micomsoft | Publisher | |
| Domus27 | Developer | |
| Don Berg | Developer | |
| Don Bisdorf | Developer | |
| Don Bluth Studios | Developer | |