| 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 | |