| 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 | |
| ASC Games NA | Publisher | |
| ASC GamesNA | Publisher | |
| ASCARON Entertainment | DeveloperPublisher | |
| ASCII | DeveloperPublisher | |
| ASCII Coproation | Publisher | |
| ASCII Corporation | DeveloperPublisher | |
| ASCII Corporation JP | Publisher | |
| ASCII CorporationJP | Publisher | |
| ASCII Entertainment | DeveloperPublisher | |
| ASCII Entertainment (JP) | Publisher | |
| ASCII EntertainmentJP | Publisher | |
| ASCII EntertainmentNA | Publisher | |
| ASCII Media Works | DeveloperPublisher | |
| ASCII Software | DeveloperPublisher | |
| ASCII Something Good | Publisher | |
| ASECC | Developer | |
| ASH2 | Developer | |
| ASHGAMES | Publisher | |
| ASK | DeveloperPublisher | |
| ASK Co Ltd. | Developer | |
| ASK Homework | Developer | |
| ASK Kodansha | DeveloperPublisher | |
| ASK Kodansha JP | Publisher | |
| ASK-Kodansha | Developer | |
| ASKGAMES | Developer | |
| ASKJP | Publisher | |
| ASKJP Midas Interactive EntertainmentEU | Publisher | |
| ASM game world | Developer | |
| ASMB Games | Developer | |
| ASNetworks | Publisher | |
| ASSAKER | Developer | |
| ASanzL | Developer | |
| ASaunders | Developer | |
| ASecondGuy | Developer | |
| AS酱 | Developer | |
| ATA_Games | Developer | |
| ATJ | Developer | |
| ATLAS | Developer | |
| ATMOS | Developer | |
| ATP Projects | Developer | |
| ATTACK MOUNTAIN | Developer | |
| ATU | Developer | |
| ATalbi | Developer | |
| ATangTuanZi | Developer | |
| AToTaT_Admin | Developer | |
| AU: 505 Games | Publisher | |
| AU: Nintendo Australia | Publisher | |
| AU: Popcorn Arcade | Publisher | |
| AU: Take-Two Interactive | Publisher | |
| AU: Tradewest | Publisher | |