| DK'tronics | DeveloperPublisher | |
| DK-Games | Developer | |
| DMA Design | Developer | |
| DMA Design (Jonathan Dye, Gary Timmons, Tiny Williams) | Developer | |
| DMA Design Limited | Developer | |
| DMGregory | Developer | |
| DMLabs | Developer | |
| DMM Games | DeveloperPublisher | |
| DMP Productions | Developer | |
| DMVortex | Developer | |
| DNC Entertainment | DeveloperPublisher | |
| DNCGAMES | Developer | |
| DNPidgey | Developer | |
| DOMO | Developer | |
| DOOBIC Entertainment | Developer | |
| DORASU | Publisher | |
| DOT | Developer | |
| DOTT Plan | DeveloperPublisher | |
| DOVEANE | Developer | |
| DPS2004 | Developer | |
| DPandaHeart | Developer | |
| DPhan Design | Developer | |
| DR Studios | Developer | |
| DR papyrus | Developer | |
| DRACHEVSKY | Developer | |
| DRAGOLITE | Developer | |
| DRAGOONERGAMES | Developer | |
| DRAX109 | Developer | |
| DREAM ON STUDIO | Developer | |
| DREW STILLWELL | Developer | |
| DROM studio Incorporation | Developer | |
| DSA | Developer | |
| DSF100 | Developer | |
| DSGA2016 | Developer | |
| DSI Games | DeveloperPublisher | |
| DSI GamesJP | Publisher | |
| DSI GamesNA | Publisher | |
| DSK Green Ice Games | DeveloperPublisher | |
| DStroid | Developer | |
| DT Mark | Developer | |
| DTF Games | Developer | |
| DTGames Entertainment | Developer | |
| DTMC | Publisher | |
| DTMC (NA) | Publisher | |
| DTMC NA | Publisher | |
| DTP Entertainment | DeveloperPublisher | |
| DTP EntertainmentEU | Publisher | |
| DTP Young Entertainment | Publisher | |
| DTheriot | Developer | |
| DU&I | Developer | |