| Cytherean Adventures | Developer | |
| Cytopia | Developer | |
| Cz_Bozn | Developer | |
| Czaruk | Developer | |
| Czester16 | Developer | |
| C² Bros Import | Publisher | |
| C² World | Publisher | |
| D Cruise | Developer | |
| D CruiseJP | Publisher | |
| D Deans | Developer | |
| D I S C O Z O N E | Developer | |
| D Richards | Developer | |
| D!EMONIC | Developer | |
| D&H Games | Publisher | |
| D' India | Developer | |
| D'Andrëw Box | Developer | |
| D'Avekki Studios | Developer | |
| D'India Software | DeveloperPublisher | |
| D'oven | Developer | |
| D's Garage 21 | Developer | |
| D-1000 Project | Developer | |
| D-CELL GAMES | Developer | |
| D-Designs | Developer | |
| D-O | DeveloperPublisher | |
| D-Pad Studio | DeveloperPublisher | |
| D-Project | Developer | |
| D-Rockets | Developer | |
| D-Studios | Developer | |
| D-Train1988 | Developer | |
| D-cruise | Developer | |
| D-tergent | Developer | |
| D. Aron | Developer | |
| D. Deschamps Magnetiques | Developer | |
| D. H. Ibbotson | Developer | |
| D. M. Moore | Developer | |
| D. Master | Developer | |
| D. Pavlovsky | Developer | |
| D. Zenith | Developer | |
| D.C. Studios Inc. | Developer | |
| D.C. True | Developer | |
| D.E.X Team | Developer | |
| D.O. Corp | DeveloperPublisher | |
| D.O. Corp. | DeveloperPublisher | |
| D0UBLEJUMP | Developer | |
| D0ddisuper | Developer | |
| D0nu7 | Developer | |
| D1GITΛL CVTS | Developer | |
| D2C Games | DeveloperPublisher | |
| D2D Games | Developer | |
| D3 | DeveloperPublisher | |
| D3 Publisher | DeveloperPublisher | |
| D3 Publisher of America | Publisher | |
| D3 PublisherJP | Publisher | |
| D3 PublisherJP,KO | Publisher | |
| D3JP | Publisher | |
| D3Publisher | DeveloperPublisher | |
| D3PublisherJP | Publisher | |
| D3T | Developer | |
| D3fCHiLD | Developer | |
| D3nX | Developer | |
| D4NDY_0 | Developer | |
| D4ngus1 | Developer | |
| D4rkD | Developer | |
| D4yz | Developer | |
| D5R | Developer | |
| D6 Entertainment BR | Developer | |
| D6 Games | Developer | |
| D7 Studios | Developer | |
| DA Studios.inc | Developer | |
| DAC Games | Developer | |
| DADIU | Developer | |
| DADO | Developer | |
| DAE Studios | Developer | |
| DAFF0111 | Developer | |
| DAGrommesh | Developer | |
| DAKU | Developer | |
| DAKÍCORP | Developer | |
| DAMAN | Developer | |
| DANDELIONGAMES | Developer | |
| DANG! | Developer | |
| DANGEN Entertainment | Publisher | |
| DANGER HEART ENTERTAINMENT | Developer | |
| DARK SANDWICH | Developer | |
| DAT.NOT.MY.GAME! | Developer | |
| DATURA HELVEDE | Developer | |
| DAYDEV | Developer | |
| DAYDREAM STUDIO | Developer | |
| DAZEL | Developer | |
| DAmieba | Developer | |
| DB Attic Studios, LLC | Developer | |
| DC Assets UY | Developer | |
| DC Comics | Publisher | |
| DC Studios | DeveloperPublisher | |
| DC True | DeveloperPublisher | |
| DCE | Developer | |
| DCF Studios | DeveloperPublisher | |
| DCP | Developer | |
| DCUGameDev | Developer | |
| DD Studios | Developer | |
| DDB | Developer | |
| DDD Wares | Developer | |
| DDL, Inc. | Developer | |
| DDR | Developer | |
| DDRKirby(ISQ) | Developer | |
| DDevilfish | Developer | |
| DDreamsGames | Developer | |
| DE Team | Developer | |
| DEANER | Developer | |
| DEATH | Developer | |
| DECBAAH | Developer | |
| DECO | Publisher | |
| DECO (JP) | Publisher | |
| DEEV Interactive | Developer | |
| DEFICIENCY PRODUCTIONZ | Developer | |
| DEFɅCID | Developer | |
| DEMBERG | Developer | |
| DENEDI | Developer | |
| DESTROYER3 | Developer | |
| DEVBOX | Developer | |
| DEVCHAT | Developer | |
| DEVHOUR GAMES | Developer | |
| DEVastationStudio | Developer | |
| DEvalen200 | Developer | |
| DExUS5 | Developer | |
| DGMKPixy | Developer | |
| DGPS Arts & Crafts | Developer | |
| DGS Software | Developer | |
| DGSpitzer | Developer | |
| DH | Developer | |
| DHM Interactive | Publisher | |
| DI EXPLOITATION | Developer | |
| DICE | Developer | |
| DICO | Publisher | |
| DIMensionNEW | Developer | |
| DINOSAURSSSSSSSS | Developer | |
| DIelph | Developer | |
| DJ | Developer | |
| DJ Burt | Developer | |
| DJ Mindar | Developer | |
| DJALFA Devs | Developer | |
| DJBatz | Developer | |
| DJL Software (David J Looker, David Whittaker) | Developer | |
| DJL Software (David J Looker, John Looker) | Developer | |
| DJL Software (David J. Looker) | Developer | |
| DJNOSTYLE (Selebus) | Developer | |
| DJonesArt | Developer | |
| DJtheGameMaker | Developer | |
| DK | Developer | |
| DK Games | Developer | |
| DK'Tronics | Publisher | |
| 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 | |