- A.W. Bruna Multimedia
- A2M (Artificial Mind and Movement)
- Abacus
- ABC Soft
- ABC Studios
- Abersoft
- Absolute Entertainment
- Access Games
- Access Software Inc
- Acclaim
- Acclaim Entertainment
- Acclaim Sports
- Acclaim Studios Austin
- Acclaim Studios Cheltenham
- Acclaim Studios Salt Lake City
- Acclaim Studios Teesside
- Accolade
- Accolade Inc
- Acid
- ACME Animation
- ACQUIRE Corporation
- Acta
- Activision
- Adanac Command Studies
- Adeline Software
- ADK
- Adrenalin Entertainment
- Adrenium
- Adventure Soft
- Aeroplane Heaven
- Agenda
- AI
- AI Implant
- Aicom
- Airtight Games
- Akella
- AKI
- Al Lowe
- Alawar Games
- Alcachofa Soft
- Alexandria Incorporated
- Alexey Pajitnov
- Alligata Software
- Almathera
- Alpha Denshi Corp
- Alphadream
- Alpine Software
- Altar Games
- Altar Interactive
- Altron Corporation
- AM2 of CRI
- AM2 R&D Dept. #2
- AMA Studios
- Amaze
- Amaze Entertainment, Inc
- Amazing Media
- Amazing Studio
- Amblin Entertainment
- American Interactive Media
- American Laser Games, Inc
- Americana
- Amstar Inc
- Amstrad
- Amusement Vision
- Ancient
- Anco Games
- Andrew Spencer Studios
- Angel Studios (Rockstar San Diego)
- Animation Magic Inc.
- Anirog Software
- Antidote Entertainment
- Anuman Interactive
- Apache
- APh Technological Consulting
- Apogee Software
- Appaloosa
- Appaloosa Interactive
- Appeal
- Apple
- Applications Software
- Aqua Pacific
- Aquire
- Arc Developments
- Arc System Works
- Arcade Lab
- Arcade Zone
- Arena
- Arenanet
- Argonaut
- Argonaut Software
- Argonaut Software Ltd.
- Arika
- Arkane
- Arkane Studios
- Art Factory
- Artattack
- Artdink Corporation
- Artech Digital Productions
- Artech Studios
- Artech Studios, Ltd.
- Artefacts Studio
- Artematica Entertainment
- Artificial Mind and Movement (A2M)
- Artificial Studios
- Artoon
- Arts Software
- Arush Publishing
- Aruze Corp.
- Arxel Tribe
- Ascaron Entertainment Ltd
- ASCII Co
- ASK
- Asmik Ace
- Asobo Studio
- Aspect
- Aspect Co. Ltd
- Aspyr
- Astragon
- Astroll Ltd.
- Asylum Entertainment
- Asylum Games
- Asylum Studios
- Atari
- Atari Games
- ATD
- Atelier Double
- Athletic Design
- Atlantis Software
- ATLUS
- Atoll Soft
- Atomic Games
- Atomic Motion
- Atomic Planet Entertainment Ltd.
- Atreid Concept
- Attention to Detail
- Audiogenic
- Auran
- Autumn Moon Entertainment
- Avalanche Software
- Avalanche Studios
- Avalon Interactive
- AWE Games
- AWEM Studio
- Awesome Dev.
- Awesome Studios