| Animoon | — | — | 1 |
| Aniplex | Rokubanchō | September 1995 | 1 |
| Anosi | Chalandri | Oktober 1987 | 1 |
| ANS TV | Baku | 1991 | 1 |
| Antelope | — | — | 1 |
| Antidote Films | Kota New York | — | 1 |
| AP Films | Slough Trading Estate | 1957 | 1 |
| Apologetics Press | Montgomery, Alabama | 1979 | 1 |
| Apple Film Production | Warsawa | 1990 | 1 |
| Apple TV | — | November 2019 | 1 |
| AQS | Praha | 27 Maret 1998 | 1 |
| Aquarius Films | — | — | 1 |
| Arad Productions Inc. | — | — | 1 |
| Arc Media | — | — | 1 |
| Arca-Winston Films Corp. | — | — | 1 |
| Arcana Studio | Coquitlam | 2004 | 1 |
| Argentina | — | 9 Juli 1816 | 1 |
| Argo Pictures | — | 14 Februari 1990 | 1 |
| Army Pictorial Service | — | — | 1 |
| Arrow Films | Hertfordshire | — | 1 |
| Arsmedia | — | — | 1 |
| Art Aia - La Dolce Berlin | — | — | 1 |
| Art Aia-Creatives / In / Residence | Sesto al Reghena | — | 1 |
| Art for The World | Jenewa | 1995 | 1 |
| Artbox | — | — | 1 |
| Artis Film | Bukares | — | 1 |
| Artist Studio | Korea Selatan | — | 1 |
| Artland | Musashino | 14 September 1978 | 1 |
| Arts Council of Wales | Wales Millennium Centre | 1946 | 1 |
| Artédis | — | 1983 | 1 |
| Asahi Broadcasting Group Holdings | Osaka | 15 Maret 1951 | 1 |
| Askania Media | Berlin | 1997 | 1 |
| Aspekt Telefilm | Hamburg | 1974 | 1 |
| Aspide 1 UG | Berlin | — | 1 |
| Associated-Rediffusion | London | 22 September 1955 | 1 |
| Association of Malayalam Movie Artists | — | — | 1 |
| AST Studio | — | — | 1 |
| Atlas Film Company | — | — | 1 |
| ATO Records | Kota New York | 2000 | 1 |
| ATR | — | 2015 | 1 |
| Attackers | Tokyo | 1996 | 1 |
| Audax Films | Santa Monica | 2013 | 1 |
| August Entertainment | — | 1988 | 1 |
| Augustus Film | Amsterdam | — | 1 |
| Australian Union Conference of Seventh-day Adventists | — | 2001 | 1 |
| Avant-Film | Oslo | 28 April 1959 | 1 |
| Avex Entertainment | — | April 2007 | 1 |
| AXS TV | Denver | 2001 | 1 |