| Atlus JP | Publisher | |
| Atlus NA | Publisher | |
| Atlus Persona Team | Developer | |
| Atlus USA | Publisher | |
| Atlus USANA | Publisher | |
| AtlusJP | Publisher | |
| AtlusJP,KO,NA | Publisher | |
| AtlusJP,KO.NA | Publisher | |
| AtlusJP,NA | Publisher | |
| AtlusNA | Publisher | |
| AtlusUS | Publisher | |
| Atlya | Developer | |
| Atma Weapon | Developer | |
| AtmaGame | Developer | |
| Atmark | DeveloperPublisher | |
| Atmos Games | Developer | |
| Atod | Developer | |
| Atod AB | Developer | |
| Atom Team | Developer | |
| AtomHack | Developer | |
| AtomLight | Developer | |
| Atomhead | Developer | |
| Atomic Blue | Developer | |
| Atomic Elbow | Developer | |
| Atomic Entertainment | Developer | |
| Atomic Fabrik Game Studio | Developer | |
| Atomic Games | DeveloperPublisher | |
| Atomic Kraken | Developer | |
| Atomic Motion | Developer | |
| Atomic Planet | Developer | |
| Atomic Planet Entertainment | Developer | |
| Atomic Revolution Software | Publisher | |
| Atomic Rocket Entertainment | Developer | |
| Atomic Toilet | Developer | |
| Atomic Wolf | Developer | |
| AtomicQ | Developer | |
| AtomicRaccoonFR | Developer | |
| Atomjack | Publisher | |
| Atooi | DeveloperPublisher | |
| Atozi | Developer | |
| Atrax | Developer | |
| Atrease | Developer | |
| Atreid Concept SA | Developer | |
| Atreyu | Developer | |
| Atrium601 | Developer | |
| Atrum | Developer | |
| Ats | Developer | |
| Atsina Corrington | Developer | |
| AttaBoy | Developer | |
| AttainableEnt | Developer | |
| Atte Okkonen | Developer | |
| Attention to Detail | Developer | |
| Atthiyya Ath | Developer | |
| Attic Door Productions | Developer | |
| Attic Entertainment Software | DeveloperPublisher | |
| AtticBoxGames | Developer | |
| Attica | Publisher | |
| Attica Kish | Developer | |
| AtticusFinn | Developer | |
| Attila Kertesz | Developer | |
| Attractive Games | Developer | |
| Attu Games | DeveloperPublisher | |
| Atty | Developer | |
| Atypical Alchemists Associate | DeveloperPublisher | |
| Atypical Games | DeveloperPublisher | |
| Atzi_ Games | Developer | |
| Aubry | Developer | |
| Audacity Interactive | DeveloperPublisher | |
| Audilis | Developer | |
| Audio Games | Developer | |
| Audio Visual Magic | Developer | |
| Audio Visual Magic (Gavin Wade, Chris Edwards) | Developer | |
| Audiogenic | DeveloperPublisher | |
| Audiogenic Software | DeveloperPublisher | |
| Audiosurf, LLC | Publisher | |
| Audiovisual Enterprises SA | Publisher | |
| Audre | Developer | |
| Audrey Castillo | Developer | |
| AudreyC | Developer | |
| AudreyL | Developer | |
| AudricGreenwood | Developer | |
| Auer | Developer | |
| AugEx | Developer | |
| AuggoFacts | Developer | |
| AugmentMyLife | Developer | |
| Augmented Irreality | Developer | |
| AugoGames | Developer | |
| Augur Studios | Developer | |
| AugureTeam | Developer | |
| August | DeveloperPublisher | |
| August Hemback | Developer | |
| August Håkansson | Developer | |
| Augustin Janvier | Developer | |
| Auhiro | Developer | |
| AukaneMin | Developer | |
| AukioGames | Publisher | |
| Aukustus | Developer | |
| Aula Arcade | Developer | |
| Aulas demonstrativas | Developer | |
| Aulden Carter | Developer | |
| Aullwen | Developer | |
| Aumni | Developer | |
| Aura Studios | Developer | |
| Auralis Creations | Developer | |
| Auran | Developer | |
| Aurel | Developer | |
| Aurelien Mary | Developer | |
| Aurelien Regard | Developer | |
| Aurii | Developer | |
| Aurion_X | Developer | |
| Auroch Digital | DeveloperPublisher | |
| Aurona | Developer | |
| Aurona Games | Developer | |
| Aurora Productions | Developer | |
| Aurora22 | Developer | |
| Aurora_Sanguine | Developer | |
| Auroras Winter | Developer | |
| Aurore | Developer | |
| Auroriax (Tom H.) | Developer | |
| Aurum Dust | Developer | |
| AurumDust | Developer | |
| AurySystem | Developer | |
| Aurélien Dos Santos | Developer | |
| Aurélien Gâteau | Developer | |
| Aurélien Lachat | Developer | |
| Aurélien VALADE | Developer | |
| Aus.Lissajous | Developer | |
| Ausstein | Developer | |
| Austellus | Developer | |
| Austin | Developer | |
| Austin Long | Developer | |
| Austin Rogers | Developer | |
| Austin Walker | Developer | |
| Austin Willoughby | Developer | |
| Austin-Chau | Developer | |
| AustralianLemon | Developer | |
| Authentics | Developer | |
| AuthorBlue | Developer | |
| Auto Generated Bitsys | Developer | |
| AutoHit Games | Developer | |
| Autofire | Developer | |
| Autoklub Rijeka | Publisher | |
| Automata UK | Publisher | |
| Automated Simulations | DeveloperPublisher | |
| Automated Simulations Inc. | DeveloperPublisher | |
| Autumn Fall Studio | Developer | |
| Autumn Games | Publisher | |
| Autumn Moon Entertainment | Developer | |
| Autumn Rain | Developer | |
| AutumnWyvern | Developer | |
| Autumnotopia | Developer | |
| Auxiliary Power | DeveloperPublisher | |
| Avalan | Developer | |
| Avalanche Productions | Publisher | |
| Avalanche Software | Developer | |
| Avalanche Software LLC | Developer | |
| Avalanche Studios | DeveloperPublisher | |
| Avalon Hill | DeveloperPublisher | |
| Avalon Hill Software | Publisher | |
| Avalon Interactive | Publisher | |
| Avalon InteractiveEU | Publisher | |
| Avalon InteractivePAL | Publisher | |
| Avanquest | DeveloperPublisher | |
| Avanquest Software | DeveloperPublisher | |
| Avant-Garde | DeveloperPublisher | |
| Avant-Garde Creations | Publisher | |
| AvantBard | Developer | |
| Avantage Software | Publisher | |
| Avantgardistic Arts | Developer | |
| Avaria Corporation | Developer | |
| Avatar Nick | Developer | |
| AvatarK0 | Developer | |
| Aventuras AD | DeveloperPublisher | |
| Aventuriers Intérimaires | Developer | |
| Aventurine SA | Developer | |
| AverageGames | Developer | |
| AverageJo | Developer | |
| Avery Crimes | Developer | |
| Avery Holmes | Developer | |
| Averyator | Developer | |
| Aveuse | Developer | |
| Avi3ator | Developer | |
| Aviala | Developer | |
| Aviark13 | Developer | |
| Aviation001 | Developer | |
| Avicr | Developer | |
| AvidGame | Developer | |
| Avidity Studios | Developer | |
| Aville13 | Developer | |
| Avior | Developer | |
| AvishayA | Developer | |
| Avit | Developer | |
| Avit, Inc. | Developer | |
| Avit-Niigata | Developer | |
| Aviv | Developer | |
| Aviv Youker Harel | Developer | |
| Aviv_Jessie_Omri | Developer | |
| Avix Games | Developer | |
| AvoCavo | Developer | |
| AvoidVania | Developer | |