| 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 | |