| 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 | |