| AP Films | Slough Trading Estate | 1957 | 1 |
| Apologetics Press | Montgomery | 1979 | 1 |
| Appian Way | — | 311 BC | 1 |
| Apple Film Production | Warsaw | 1990 | 1 |
| Aquarius Films | — | — | 1 |
| Arad Productions Inc. | — | — | 1 |
| Aragón TV | Aragon | 2006 | 1 |
| Arc Media | — | — | 1 |
| Arca-Winston Films Corp. | — | — | 1 |
| Arcana Studio | Coquitlam | 2004 | 1 |
| Archaia Entertainment | Hollywood | 2002 | 1 |
| Archant | Norwich | 1845 | 1 |
| Archie Comics | New York, Pelham | 1939 | 1 |
| Argo Pictures | — | February 14, 1990 | 1 |
| Argus Film Produktie | Amsterdam | — | 1 |
| Ark Resources Entertainment | — | 2002 | 1 |
| Armenia 1 | Yerevan | November 29, 1956 | 1 |
| Army Pictorial Service | — | — | 1 |
| Arpa Films | Barcelona | — | 1 |
| ARRAY | — | 2010 | 1 |
| Arrow-Film | Oslo | 1964 | 1 |
| Arsmedia | — | — | 1 |
| Art Aia - La Dolce Berlin | — | — | 1 |
| Art Aia-Creatives / In / Residence | Sesto al Reghena | — | 1 |
| Art for The World | Geneva | 1995 | 1 |
| Artis Film | Bucharest | — | 1 |
| Artist Studio | South Korea | — | 1 |
| Artland | Musashino | September 14, 1978 | 1 |
| Arts Council of Wales | Wales Millennium Centre | 1946 | 1 |
| Artza Productions | — | 2006 | 1 |
| As Films Producción | — | — | 1 |
| ASA Film | Copenhagen | 1936 | 1 |
| Ascot Elite Entertainment Group | Zurich | 1928 | 1 |
| Askania Media | Berlin | 1997 | 1 |
| Aspartame Jack | — | — | 1 |
| Aspekt Telefilm | Hamburg | 1974 | 1 |
| Association of Malayalam Movie Artists | — | — | 1 |
| AST Studio | — | — | 1 |
| Astor Pictures | New York City | 1930 | 1 |
| Asymmetrical Productions | California | 1993 | 1 |
| AT-Prod | Brussels | 1994 | 1 |
| ATO Records | New York City | 2000 | 1 |
| Atomfilm | — | — | 1 |
| Atria | — | 1953 | 1 |
| Attackers | Tokyo | 1996 | 1 |
| Audax Films | Santa Monica | 2013 | 1 |
| Audiovisual Archive of the Democratic and Labour Movement | — | — | 1 |
| August Entertainment | — | 1988 | 1 |