| Alpha Films | — | — | 1 |
| Alta Loma Films | — | December 1999 | 1 |
| Alta Vista | — | — | 1 |
| Altamira Pictures | — | 1993 | 1 |
| Alvernia Studios | — | — | 1 |
| Amaco Investments | — | — | 1 |
| Amaru Entertainment | Atlanta | 1997 | 1 |
| Ambient Entertainment | Hanover | October 11, 1999 | 1 |
| Amblin Television | Universal City | July 31, 1984 | 1 |
| AMC Networks International Southern Europe | Madrid | July 8, 2014 | 1 |
| American Broadcasting-Paramount Theatres, Inc. | 1501 Broadway | November 15, 1949 | 1 |
| Andell Holdings | Los Angeles | — | 1 |
| Angel Digital Pvt Ltd | — | — | 1 |
| Angel Films | Copenhagen | 1988 | 1 |
| Angel Films | Helsinki | August 11, 2009 | 1 |
| Anhui Television | — | September 30, 1960 | 1 |
| Animafilm | Sector 3 | 1964 | 1 |
| Animation Digital Network | Paris | September 2013 | 1 |
| Animoon | — | — | 1 |
| Anita Stewart Productions | — | 1917 | 1 |
| Annapurna Animation | High Ridge, North Stamford | December 2022 | 1 |
| ANS TV | Baku | 1991 | 1 |
| Anthology Studios | — | November 17, 2020 | 1 |
| Antidote Films | New York City | — | 1 |
| Apocalypso Pictures | Boars Hill | — | 1 |
| Apologetics Press | Montgomery | 1979 | 1 |
| Apple Film Production | Warsaw | 1990 | 1 |
| Applecross peninsula | — | — | 1 |
| AQS | Prague | March 27, 1998 | 1 |
| Arad Productions Inc. | — | — | 1 |
| Aragón TV | Aragon | 2006 | 1 |
| Arc Media | — | — | 1 |
| Arca-Winston Films Corp. | — | — | 1 |
| Arcapix | — | — | 1 |
| Archaia Entertainment | Hollywood | 2002 | 1 |
| Archant | Norwich | 1845 | 1 |
| Archdiocese of Caceres | — | June 29, 1951 | 1 |
| Archer Street | London | — | 1 |
| Archie Comics | New York, Pelham | 1939 | 1 |
| Arclight Films | Sydney | 2002 | 1 |
| Arctandriafilm | — | — | 1 |
| Argo Pictures | — | February 14, 1990 | 1 |
| Ark Resources Entertainment | — | 2002 | 1 |
| Armadillo Film | Amsterdam | 2001 | 1 |
| Armenia 1 | Yerevan | November 29, 1956 | 1 |
| Army Pictorial Service | — | — | 1 |
| Arpa Films | Barcelona | — | 1 |
| ARRAY | — | 2010 | 1 |