| AMRN | Developer | |
| AMS | Developer | |
| AMStudio | Developer | |
| AMT Games | Developer | |
| AMT Savan | Publisher | |
| AMT Savan Corp. | Publisher | |
| AMX004_Qubeley | Developer | |
| AN-studios | Developer | |
| ANCO | Developer | |
| ANGROWA | Developer | |
| ANILGDEV | Developer | |
| ANIM•ACE | Developer | |
| ANOZOR | Publisher | |
| ANV | Hadrian Lin | Developer | |
| ANyden | Developer | |
| AOFG | Developer | |
| AObit | Developer | |
| APGamesR | Developer | |
| APPLAB | Developer | |
| APXStudios | Developer | |
| APh Technological Consulting | Developer | |
| APiotrW | Developer | |
| AQ Interactive | DeveloperPublisher | |
| AQ InteractiveJP | Publisher | |
| AQUANAUTS HOLIDAY | Developer | |
| AR Borno | Developer | |
| ARBEX | Developer | |
| ARBORETA GAMES | Developer | |
| ARC | Publisher | |
| ARC Entertainment | Developer | |
| ARC EntertainmentPAL | Publisher | |
| ARCADEdreams | Developer | |
| AREGO | Developer | |
| ARF Game Studio | Developer | |
| ARF Initiative | Developer | |
| ARGOnaut | Developer | |
| ARKAD Studio | Developer | |
| ARKLIGHT | Developer | |
| ARP Software (Tony R. Porter, Jon Harrison, Ben Daglish) | Developer | |
| ARQUOIA | Developer | |
| ARStudio | Developer | |
| ARTIFACTS | Developer | |
| ARUSH Entertainment | Publisher | |
| AS | Developer | |
| AS Team | Developer | |
| AS-Freegames | DeveloperPublisher | |
| ASA Studio | Developer | |
| ASAPL0 | Developer | |
| ASATERA | Developer | |
| ASC Games | DeveloperPublisher | |