- A'n'F Software
- A. N. A. L. O. G. Computing
- Aardvark
- Abersoft
- Abstract Concepts
- Access Software
- Acclaim
- Accolade
- Acme Software
- Acornsoft
- Activision
- Activision Value
- Addictive
- Addison-Wesley
- Adventions
- Adventure Company, The
- Adventure International
- Adventure Soft
- Aegis Developments
- Agetec
- Airwave Adventures
- Akella
- Alchemist Research
- Alligata Software Ltd
- Alternate Source, The
- Alternative Software Ltd
- Amaze Entertainment
- Amazing Media
- American Eagle Software, Inc
- Amuze
- Angelsoft, Inc
- Anirog
- Apocalypse
- Apogee
- Apogee Software, Ltd.
- Application Services Company, Inc
- ArenaNet
- Argonaut Games
- Argus Press Software Ltd
- Ariolasoft
- Arla
- Artic Computing
- Artifact Entertainment
- Artworx
- Art Department
- ARUSH Entertainment
- ASCII Entertainment Software
- ASP Software Ltd
- Atari
- Atlantis
- Atlus USA
- ATOD
- Atomic Games
- Attention to Detail
- Audiogenic
- Auran
- Automata
- Avalon Hill
- Avant-Garde Creations
- Aventuras AD
- A & B Computing Magazine
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