| 3DD Productions | London Borough of Camden | — | 1 |
| 4 Mecs en Baskets | Paris | 2000 | 1 |
| 42 km film | Bucharest | 2004 | 1 |
| 42nd Street Productions | — | — | 1 |
| 4S Production | Prague | March 17, 1997 | 1 |
| 6253032 Canada Inc. | — | — | 1 |
| 6893619 Canada Inc. | — | — | 1 |
| 8565686 Canada Inc. | — | — | 1 |
| A Very Good Production | United States | 2003 | 1 |
| A&o buero filmproduktion | Cologne | — | 1 |
| A.A. Les Films Belges | — | — | 1 |
| Aattache Films | — | — | 1 |
| AB Stockholmfilm | — | 1937 | 1 |
| Academy of Dramatic Art | Zagreb | 1896 | 1 |
| Acropolis Entertainment | — | October 6, 2006 | 1 |
| Act III Productions | — | — | 1 |
| Actas | Mitaka | July 6, 1998 | 1 |
| Action Synthese | — | April 21, 1998 | 1 |
| Actors Studio | New York City | October 5, 1947 | 1 |
| Adam Film | — | — | 1 |
| Adam's World Of Imagination | Kerala | 2015 | 1 |
| Adelaide Film Festival | Glenside | 2002 | 1 |
| Adelaide Productions | Culver City | 1993 | 1 |
| Adler Entertainment | — | — | 1 |
| Advanced Action Videos | Redding | May 7, 2003 | 1 |
| Aegean Oil S.A. | — | — | 1 |
| Aes-Nihil Productions | — | — | 1 |
| Aetios Productions | Saint-Sauveur | — | 1 |
| Afghan Film | — | 1968 | 1 |
| After Dark Video | — | — | 1 |
| After the Wedding | — | — | 1 |
| AI Multimedia | Nashville | 2018 | 1 |
| Aim Rain Limited | Middlesex | May 21, 1993 | 1 |
| Ajiado | Saitama | 1978 | 1 |
| Akanga Film Asia | — | — | 1 |
| Al Jazeera Balkans | Sarajevo | 2011 | 1 |
| Al Jazeera Documentary Channel | — | 2007 | 1 |
| Ala Bianca Group S.r.l. | Modena | 1990 | 1 |
| Albanian General Vision | — | — | 1 |
| Albanian National Center of Cinematography | — | — | 1 |
| Aldo, Giovanni & Giacomo | — | — | 1 |
| ALEF Film & Media Group | Bratislava | 1997 | 1 |
| Alexandros Film | — | — | 1 |
| Algefa | Berlin | 1936 | 1 |
| Alien Films Entertainment | — | — | 1 |
| All Yours Film | — | — | 1 |
| Alligator Film | — | — | 1 |
| AllMusic | — | 1991 | 1 |