| Basic Cinematografica | Italy | — | — | 1 |
| Basque Government | Spain | 1980 | — | 1 |
| Batabat | Spain | — | — | 1 |
| Batavia Pictures | Indonesia | — | — | 1 |
| Bathysphere productions | France | — | — | 1 |
| Bautafilm | Sweden | 2010 | — | 1 |
| Bavaria Entertainment | Germany | 1996 | — | 1 |
| Bavaria-Filmkunst | Germany | — | — | 1 |
| Baya Films | Algeria | — | — | 1 |
| Baš Čelik Film House | Serbia | — | — | 1 |
| BBC Earth | United Kingdom | 2015 | — | 1 |
| BBC Four | United Kingdom | 2002 | — | 1 |
| BBC Persian Television | Afghanistan | 2009 | — | 1 |
| BBC Radio Bristol | United Kingdom | 1970 | — | 1 |
| BBC Studios | United Kingdom | April 2016 | — | 1 |
| BBC Two | United Kingdom | April 20, 1964 | — | 1 |
| BE-TV | Colombia | 2008 | — | 1 |
| Beate Uhse | Germany | 1981 | — | 1 |
| Beatrice Film | Italy | — | — | 1 |
| Becker Entertainment | Australia | 1965 | — | 1 |
| Bedlam Productions | — | — | — | 1 |
| Bedna Films | Czech Republic | May 13, 2009 | — | 1 |
| Bedrock Studios | United States | — | — | 1 |
| Bee Train | Japan | 1997 | — | 1 |
| Bee Vine Pictures | Japan | 2007 | 2008 | 1 |
| Behindwoods | India | 2004 | — | 1 |
| Beijing Gehua CATV Network Co.,Ltd. | People's Republic of China | — | — | 1 |
| Bel Air Classiques | France | 2004 | — | 1 |
| Belarus Free Theatre | United Kingdom | March 30, 2005 | — | 1 |
| Belgacom 11 | Belgium | — | — | 1 |
| Believe Pictures | — | 2003 | — | 1 |
| Bell Broadcast and New Media Fund | Canada | 1997 | — | 1 |
| Bell Media | Canada | 2001 | — | 1 |
| Bellini Industries | United States | — | — | 1 |
| Bend It Films | United Kingdom | — | — | 1 |
| Benecé Produccions | Spain | — | — | 1 |
| Benelux Film Distributors | Belgium | 2006 | June 4, 2019 | 1 |
| Benetone Hillin Entertainment | United States | 2011 | — | 1 |
| Bento Box Entertainment | United States | 2009 | — | 1 |
| Berliner Ensemble | Germany | 1949 | — | 1 |
| Best Brains | — | 1988 | — | 1 |
| Best Film | Poland | November 7, 2001 | — | 1 |
| Beta Fiction Spain | Spain | 2022 | — | 1 |
| BFI Production Board | — | — | — | 1 |
| Bianca Films | Italy | — | — | 1 |
| Bibury Animation Studios | Japan | May 2017 | — | 1 |
| Big Things Films | Ireland | 2024 | — | 1 |
| BIGFlix | India | 2008 | — | 1 |
| Bild- und Filmamt | Germany | 1917 | — | 1 |
| BIND | Netherlands | — | — | 1 |
| Bioscop | Czech Republic | 2002 | — | 1 |
| Bioware | Canada | February 1995 | October 21, 2026 | 1 |
| Bir Film | Turkey | 2002 | — | 1 |
| Bitters End | Japan | April 22, 1994 | — | 1 |
| Biz Television | United States | 2011 | — | 1 |
| BKP production | Czech Republic | October 11, 2000 | — | 1 |
| Blachfilms | Canada | — | — | 1 |
| Black Lion Pictures | Finland | March 28, 2012 | December 20, 2024 | 1 |
| Black Spark Film & TV | Sweden | — | — | 1 |
| Black Walk | — | 1990 | — | 1 |
| Blackpills | France | May 5, 2017 | — | 1 |
| Blacksmith | France | December 20, 2022 | — | 1 |
| Blankface | Finland | — | — | 1 |
| Blast! Films | United Kingdom | — | — | 1 |
| Blender Institute | Netherlands | 2007 | — | 1 |
| Bliss Media Ltd | — | — | — | 1 |
| Blizzard Entertainment | United States | February 8, 1991 | — | 1 |
| Block 2 Distribution | People's Republic of China | 1994 | — | 1 |
| Blondie Girl Productions | United States | — | — | 1 |
| Blood Ceremony Films | Finland | — | — | 1 |
| Bloody Mary Production | France | — | — | 1 |
| Bloomberg L.P. | United States | October 1981 | — | 1 |
| Blowback Productions | United States | 1988 | — | 1 |
| Blu Cinematografica | Italy | — | — | 1 |
| Blue eyes Fiction | Germany | — | — | 1 |
| Blue Hills Pictures | Czech Republic | March 13, 2019 | — | 1 |
| Blue Omega | United States | 2003 | June 26, 2009 | 1 |
| Blue-Tongue Films | — | — | — | 1 |
| Bluebox Limited | — | 2001 | — | 1 |
| Blueming Pictures GmbH | — | December 5, 2024 | — | 1 |
| BMG Music Publishing | — | 1987 | 2007 | 1 |
| BNN | Netherlands | August 15, 1997 | September 2018 | 1 |
| Bobbs-Merrill Company | United States | 1850 | — | 1 |
| Boje Buck Produktion | Germany | — | — | 1 |
| Bolshoi Theatre | Russia | March 28, 1776 | — | 1 |
| Bolívar Films | Venezuela | 1940 | — | 1 |
| Bonfire | Budapest | — | — | 1 |
| Bonjour Pictures | Belgium | — | — | 1 |
| Borough Film | United Kingdom | — | — | 1 |
| Bosko Biati Film | Germany | — | — | 1 |
| Boulder Media | Ireland | 2000 | — | 1 |
| Boxoffice International Pictures | — | 1950 | 1977 | 1 |
| Bracan | United Kingdom | — | — | 1 |
| Brainfeeder | United States | 2008 | — | 1 |
| Brasil Paralelo | Brazil | August 9, 2016 | — | 1 |
| Brave Man Media | United States | — | — | 1 |
| Break Out Pictures | Ireland | — | — | 1 |
| Bren Entertainment | Spain | February 22, 2000 | — | 1 |
| Bridge Entertainment Group | Kingdom of the Netherlands | — | — | 1 |
| Bridgit Folman Film Gang | Israel | — | — | 1 |