| A Heartful of Games | Madrid | — | video game industry |
| A&F Software | — | — | — |
| A.I Co., Ltd. | Tokyo, Machida | July 1990 | video game industry |
| Abbey Games | Utrecht | March 19, 2012 | video game industry |
| Abrakam | Angleur | — | video game industry |
| Absolute Entertainment | Upper Saddle River | 1986 | video game industry |
| Abstraction Games | Valkenswaard | 2007 | video game industry |
| ABX Games Studio | — | — | video game industry |
| Abylight | Barcelona | — | video game industry |
| Access Games | Osaka | May 30, 1996 | video game industry |
| Acclaim Japan, Ltd. | Tokyo | — | video game industry |
| Acclaim Studios Austin | Austin | August 14, 1991 | video game industry |
| Acclaim Studios London | Croydon | 1984 | — |
| Accolade | San Jose | 1984 | video game industry |
| ACE Software | Barcelona | — | video game industry |
| Ackk Studios | — | 2013 | video game industry |
| Acornsoft | Cambridge | 1980 | — |
| Acram Digital | — | 2014 | video game industry |
| Action Forms | Kyiv | 1995 | video game industry |
| Activision Value Publishing | — | August 2000 | — |
| Actoon Studio | — | — | video game industry |
| Adeline Software International | Lyon | 1992 | manufacturing of games and toys |
| Adelta | — | 2014 | video game industry |
| Adobe | San Jose | February 28, 1982 | software industry |
| Adult Swim | Atlanta | September 1999 | — |
| Adult Swim Games | — | 2005 | video game industry |
| Adventure International | Longwood | 1978 | video game industry |
| Adventure Soft | Sutton Coldfield | 1983 | — |
| Aeria | Tokyo | October 30, 2002 | — |
| Aeria Games | Berlin | 2006 | video game industry |
| Aerie Gaming Studios | — | 2018 | video game industry |
| Aerosoft | Paderborn/Lippstadt Airport | 1991 | — |
| Agate Studio | Bandung | 2009 | — |
| Agatsuma Entertainment | Tokyo | — | video game industry |
| Ageia | Santa Clara | 2002 | — |
| Agenda | Sapporo | November 2, 1990 | video game industry |
| Aidem Media | Gdańsk | September 10, 1997 | video game industry |
| Akatsuki Inc. | Tokyo | 2010 | — |
| Akella | Moscow | 1993 | video game industry |
| Akies Games | — | — | — |
| Alawar Entertainment | Novosibirsk | 1999 | video game industry |
| Albino Moose Games | Austin | — | — |
| Alcatraz Entertainment Software | — | — | video game industry |
| Alfa System | Kumamoto | 1988 | video game industry |
| Aliasworlds Entertainment | Minsk | 2001 | video game industry |
| Alientrap | Saskatoon | 2002 | video game industry |
| Alike Studio | Barcelona | 2014 | video game industry |
| Alligata Software Ltd. | Sheffield | 1982 | — |
| Allods Team | — | 2006 | video game industry |
| Alpha Dog Games | Halifax | — | — |
| Altron | Tokyo, Minato | September 10, 1983 | video game industry |
| Alvion | Osaka | 1996 | video game industry |
| Amada Printing | Saitama Prefecture | July 16, 1956 | — |
| Amanotes | — | 2014 | video game industry |
| Amaze Entertainment | Kirkland | 1997 | video game industry |
| Amazon | Seattle | July 5, 1994 | web hosting service |
| Ambrella | Tokyo | 1996 | video game industry |
| American Laser Games | Albuquerque | 1989 | video game industry |
| Amused Sloth | London | 2010 | — |
| Amusement Vision | Ota | 2000 | video game industry |
| Amuze | Solna Municipality | 1996 | video game industry |
| Amuzo Games | Bournemouth | 1998 | — |
| Amzy | — | April 21, 2008 | — |
| Anarchy Enterprises | — | 1994 | video game industry |
| Anchor Inc. | Tokyo | 1996 | video game industry |
| Ancient | Hino | 1990 | video game industry |
| Ancient Forge | — | — | — |
| Andamiro | Seoul | 1992 | video game industry |
| Anic | Seoul | May 2013 | video game industry |
| Animation Arts | — | — | — |
| Animation Magic | Gaithersburg | 1992 | video game industry |
| Anirog Software | — | 1982 | — |
| Ankama Games | Roubaix | October 2, 2006 | video game publishing |
| Ant Software | — | 1989 | video game industry |
| Ant Workshop | Edinburgh | — | — |
| Antimatter Games | Truro | 2013 | — |
| Apex Computer Productions | United Kingdom | — | — |
| Apogee Software | Garland | — | video game industry |
| Appeal | — | 1995 | — |
| Appelmoes | Gorinchem | — | video game industry |
| Apple Inc. | Cupertino | April 1976 | software industry |
| Application Systems Heidelberg | Heidelberg | 1985 | video game industry |
| APriori Digital | Bristol | June 28, 2013 | — |
| AQ Interactive | Tokyo | October 2005 | video game industry |
| AQUAPLUS | — | — | video game industry |
| Aquiris Game Studio | Porto Alegre | 2007 | video game industry |
| Arario Corporation | Tokyo | June 2007 | — |
| Arc Developments | — | 1984 | video game industry |
| Arc Games | Redwood City, San Francisco | 2008 | video game industry |
| Arc System Works | Yokohama | May 12, 1988 | video game industry |
| Arcade Zone | London | 1992 | — |
| Arcen Games | Cary | 2009 | video game industry |
| ArenaNet | Bellevue | 2000 | video game industry |
| Aria | — | March 2006 | video game industry |
| Ariel Co., Limited | Neihu District | November 28, 2017 | — |
| Arika | Tokyo | November 1995 | video game industry |
| Ariolasoft | Rietberg | 1982 | video game industry |
| Ariolasoft UK | — | — | — |
| Arise | Minsk | 2002 | video game industry |
| Ark Heiral | — | — | video game industry |
| Arkadium | New York City | 2001 | — |
| Armor Games | Irvine | October 2005 | video game industry |
| Arrowiz | Shanghai | 2016 | video game industry |
| Art & Magic | — | 1991 | — |
| Art Co., Ltd | Tokyo | 1995 | video game industry |
| Art Data Interactive | — | — | video game industry |
| Arte | Strasbourg | — | — |
| Artefacts Studio | Lyon | 1994 | video game industry |
| Artic Software | Brandesburton | — | — |
| ArticNet | — | April 4, 2013 | video game industry |
| Artifex Mundi | Katowice | 2006 | video game industry |
| Artificial Life, Inc. | Hong Kong | 1994 | video game industry |
| Artoon | Yokohama | August 27, 1999 | video game industry |
| Artworx | — | — | video game industry |
| Aruma Studios | — | — | video game industry |
| Arush Entertainment | Scottsdale | — | video game industry |
| Arxel Tribe | Slovenia | 1990 | video game industry |
| ASa Project | — | March 30, 2007 | video game industry |
| Ascaron | Gütersloh | 1991 | video game industry |
| ASCII Media Works | Shinjuku | April 2008 | video game industry |
| Ashborne Games | Brno | 2020 | video game industry |
| ASK | — | 1972 | — |
| Asobo Studio | Bordeaux | October 17, 2002 | video game publishing |
| Asphere Innovations | Bangkok | 2001 | video game industry |
| Aspyr | Austin | 1996 | video game industry |
| Asteristic Game Studio | — | — | video game industry |
| Astragon | Mönchengladbach | 2000 | video game industry |
| Astrotale Games | — | 2019 | video game industry |
| Atari Corporation | Sunnyvale | July 2, 1984 | video game industry |
| Atari Games | Milpitas | July 1984 | video game industry |
| Atari Interactive | New York City | 1998 | video game industry |
| Atari Program Exchange | — | February 1981 | video game industry |
| Atari SA | Lyon, Paris | June 1983 | publishing of application software |
| Atari, Inc. | New York City | February 1993 | video game industry |
| Atari, Inc. | New York City | February 1993 | video game industry |
| Atarisoft | — | 1983 | video game industry |
| Atay Games | London | 2021 | — |
| Atelier 801 | Lille | October 14, 2011 | video game publishing |
| Atlantis Interactive Entertainment | — | 2003 | video game industry |
| Atlus | Austin | April 7, 1986 | video game industry |
| Atom Team | — | — | video game industry |
| Atomic Raccoon Studio | — | — | — |
| AtomicTorch Studio | — | — | video game industry |
| Attention to Detail | Hatton | 1988 | — |
| Atypique Studio | La Ciotat | June 27, 2017 | — |
| Auroch Digital | — | — | — |
| Australia | — | 1901 | — |
| Automata UK | Portsmouth | 1977 | — |
| Autumn Games | New York City | 2007 | video game industry |
| Avalanche Software | Salt Lake City | 1995 | video game industry |
| Avalon Interactive | London | 2003 | — |
| Aventurine SA | Athens | 2003 | video game industry |
| Aviary Films | London | June 13, 2007 | — |
| Awaceb | — | — | video game industry |
| Awesome Golf Range | — | — | golf technology |
| Awesome Play | — | — | — |
| Axis Games | Fort Mill | 2003 | video game industry |
| Axyos Games | — | — | — |
| À la mode games | Broadstairs | May 16, 2022 | — |