| Dedreek | Developer | |
| DedutioN | Developer | |
| DeeCeeWorks | Developer | |
| DeeGrim | Developer | |
| DeeJayLSP | Developer | |
| DeeMainiac | Developer | |
| Deeborm | Developer | |
| Deebrol | Developer | |
| Deeli Network Technology | Developer | |
| Deen Kei | Developer | |
| Deep Digital Design | Developer | |
| Deep End Games | DeveloperPublisher | |
| Deep Fried Entertainment | Developer | |
| Deep Red Games | Developer | |
| Deep River Publishing | Publisher | |
| Deep Shadows | Developer | |
| Deep Silver | DeveloperPublisher | |
| Deep Silver Dambuster | Developer | |
| Deep Silver UK | Publisher | |
| Deep Silver Vienna | Developer | |
| Deep SilverPAL | Publisher | |
| Deep SilverPAL EU | Publisher | |
| Deep Space | Developer | |
| Deep Studio | Developer | |
| Deep Thought Software (Keith A. Goodyer, Denis Hickie) | Developer | |
| Deep Thought Software (Keith A. Goodyer, Denis Hickie, Darren Melbourne) | Developer | |
| Deep Vigil Studio | Developer | |
| Deep Water | Publisher | |
| Deep-Fold | Developer | |
| Deepnight Games | Developer | |
| Deer Farm | Developer | |
| Deerbell | Developer | |
| Deerfox Games | Developer | |
| Deerpyboi | Developer | |
| Deex | Developer | |
| Deezaath | Developer | |
| Default Labs | Developer | |
| Default developer | Developer | |
| Defaultsound | Developer | |
| Defentures | Developer | |
| Defiant Ape Studios | Developer | |
| Defiant Development | DeveloperPublisher | |
| DefiantNarwhal | Developer | |
| DefinitelyNotAShark | Developer | |
| Deflorio | Developer | |
| Defo Mort | Developer | |
| DeftBlue | Developer | |
| Degica | Publisher | |
| Degica Games | Publisher | |
| Degoma | DeveloperPublisher | |
| Dei-bit | Developer | |
| Deibner Entertainment | Developer | |
| Deibus Studios | Developer | |
| Deimos Games | Developer | |
| DejaBug Games | Developer | |
| DejaDrew | Developer | |
| Dejan13 | Developer | |
| Dejima | Developer | |
| Dejobaan Games | Developer | |
| Dejvo | Developer | |
| DekaWolf | Developer | |
| DekeDev | Developer | |
| Dekori | Developer | |
| Del | Developer | |
| DelSarafgames | Developer | |
| DelSoft | Developer | |
| Del_Duio | Developer | |
| Delacannon | Developer | |
| Delacroz | Developer | |
| Delazus | Developer | |
| Delca | Developer | |
| Delezie | Developer | |
| Delfin | Developer | |
| Deli Interactive | Developer | |
| DeliciousGames | Developer | |
| DelightWorks | Publisher | |
| Delightfullymad | Developer | |
| Delightworks | Publisher | |
| Delimma Studio | Developer | |
| Delirium Games | Developer | |
| Delirium Studios | DeveloperPublisher | |
| DeliroGames | Developer | |
| DeliverGames | Developer | |
| Delos Software (Andrew Severn, Martin Severn, Colin Swinbourne, Mike Brown) | Developer | |
| Delos Software (Mark Haden, David Wright, Martin Severn) | Developer | |
| Delphic | Developer | |
| Delphine Software | DeveloperPublisher | |
| Delphine Software International | DeveloperPublisher | |
| Delrel | Developer | |
| Delta 4 | Publisher | |
| Delta 4 (Fergus McNeill, Judith Child) | Developer | |
| Delta 4 Interactive | Developer | |
| Delta 4 Software | Developer | |
| Delta Arts | Developer | |
| Delta Rayquaza | Developer | |
| Delta Soft | Publisher | |
| Delta Software | Publisher | |
| Delta Tao Software | DeveloperPublisher | |
| Deltanullnull | Developer | |
| Deltaplane | Developer | |
| Delthor Games | Developer | |
| Delton T. Horn | Developer | |
| Deltros | Developer | |
| Deluge Games | Developer | |
| DelumStudios | Developer | |
| Delunado | Developer | |
| Deluvi | Developer | |
| Delvatron | Developer | |
| Delve Interactive | Developer | |
| Dema studios | Developer | |
| Demeno | Developer | |
| Dementia | Developer | |
| Dementia (Gary Priest, Kevin Bulmer, Jonathan Dunn) | Developer | |
| Dementia Productions | Developer | |
| Demerara Games | Developer | |
| Demi | Developer | |
| Demian | Developer | |
| Demiero | Developer | |
| DemigodDave | Developer | |
| Demigration | Developer | |
| Demimonde | Developer | |
| Demiurge Studios | Developer | |
| Demizo | Developer | |
| Demjanjuk06 | Developer | |
| DemmyDev | Developer | |
| DemonClaus | Developer | |
| DemonGyro | Developer | |
| DemonsKiddy | Developer | |
| Dempa | DeveloperPublisher | |
| Dempa JP | Publisher | |
| Dempa Micomsoft | DeveloperPublisher | |
| Dempa Micomsoft Co., LTD | Publisher | |
| Dempa Shimbunsha | Publisher | |
| Dems | Developer | |
| Den Normale | Developer | |
| Den'Z | Publisher | |
| DenGra | Developer | |
| DenTheMan | Developer | |
| Denari | Developer | |
| Denda Games | Publisher | |
| Denebola Interactive | Developer | |
| Denedox | Developer | |
| Dengar | Developer | |
| Denhonator | Developer | |
| Deni Romance | Developer | |
| Denis | Developer | |
| Denis Cormier | Developer | |
| Denis Kazantsev | Developer | |
| Denis_Grenier | Developer | |
| Denixmis | Developer | |