| Bit Golem | Poland | 2015 | 1 | — |
| Bit Managers | Spain | 1988 | 1 | — |
| Bithell Games | United Kingdom | 2013 | 3 | 2 |
| Bitmap Soft | United Kingdom | 2019 | — | 1 |
| Bitmen Studios | Austria | November 17, 2010 | 1 | 1 |
| Bits Laboratory | Japan | 1985 | 1 | — |
| Bits Studios | United Kingdom | 1984 | 2 | — |
| Bitten Toast Games | Canada | — | 2 | 2 |
| Bitwave Games | Sweden | 2013 | 12 | 12 |
| Bizarre Creations | United Kingdom | 1994 | 6 | — |
| Black Bean Games | Italy | 2004 | 1 | 4 |
| Black Cube Games | Netherlands | 2012 | 1 | 1 |
| Black Element Software | Czech Republic | 2000 | — | — |
| Black Forest Games | Germany | 2012 | 6 | — |
| Black Hole Entertainment | — | 2001 | 1 | — |
| Black Isle Studios | United States | 1996 | 4 | 2 |
| Black Lantern Studios, Inc. | United States | 2003 | 3 | — |
| Black Ops Entertainment | United States | 1994 | 2 | — |
| Black Rock Studio | United Kingdom | 1998 | 9 | — |
| Black Salt Games | New Zealand | — | 1 | — |
| Black Sheep Studio | France | — | 3 | — |
| Black Tower Studios | — | March 8, 2012 | 1 | — |
| Black Wing Foundation | — | 2006 | 1 | — |
| Blackbird Interactive | — | 2007 | 2 | — |
| BlackMill Games | Netherlands | 2013 | 4 | 2 |
| Blast Entertainment | United Kingdom | — | — | 2 |
| Blaze | United States | — | 1 | 2 |
| Blazing Griffin | United Kingdom | 2011 | 2 | 2 |
| Blendo Games | United States | 2010 | 1 | 1 |
| Blind Squirrel Entertainment | United States | 2010 | 5 | — |
| Blindflug Studios | Switzerland | — | 1 | — |
| Blitz Games | United Kingdom | 1990 | 10 | — |
| Blitz Games Studios | United Kingdom | 1990 | 7 | 1 |
| Blizzard Entertainment | United States | February 8, 1991 | 19 | 17 |
| Blizzard North | United States | 1993 | 2 | — |
| Bloober Team | Poland | 2008 | 5 | 1 |
| Blowfish Studios | Australia | 2008 | 2 | 12 |
| Blue Brain Games | Slovakia | — | 3 | 3 |
| Blue Byte Mainz | Germany | 1995 | 3 | — |
| Blue Fang Games | United States | 1998 | 10 | — |
| Blue Isle Studios | Canada | 2010 | 1 | — |
| Blue Mammoth Games | United States | 2009 | 1 | — |
| Blue Planet Software | United States | 1996 | 1 | 2 |
| Blue Sunset Games | Poland | 2016 | 2 | — |
| Blue Tongue Entertainment | Australia | 1995 | 2 | — |
| Blue Wizard Digital | Canada | June 2014 | 8 | 8 |
| Bluemoon Interactive | Estonia | — | 1 | — |
| Blueshift Media | United Kingdom | — | 1 | 1 |
| Blueside | South Korea | 2003 | 1 | — |
| BlueSky Software | United States | 1988 | 9 | 1 |
| Bohemia Interactive | Czech Republic | 1999 | 15 | 12 |
| BOKE | People's Republic of China | April 2010 | — | 2 |
| Bokeh Game Studio | Japan | August 13, 2020 | 1 | — |
| Boltrend Games | People's Republic of China | — | — | 1 |
| Bombservice | Brazil | — | 2 | — |
| Bongfish | Austria | — | 3 | 1 |
| Bonnier Multimedia | Sweden | February 13, 1933 | — | 1 |
| Bonus Level Entertainment | Germany | 2016 | 1 | — |
| Bonus Stage Publishing | Finland | — | — | 7 |
| Boomfire Games | Spain | 2015 | 1 | — |
| BOOST ON | Japan | December 1997 | — | 2 |
| BorderLeap | United States | — | 1 | — |
| Boss Game Studios | United States | 1994 | 1 | — |
| Boss Team Games | United States | — | — | 2 |
| Bossa Studios | United Kingdom | October 2010 | 3 | 2 |
| BossAlien | United Kingdom | June 3, 2011 | 1 | — |
| Bothtec | Japan | August 6, 1997 | — | 1 |
| Bplus | Austria | — | 3 | 2 |
| Brain in a Jar | United Kingdom | — | 1 | — |
| Braingame Publishing | Germany | 1994 | 4 | 3 |
| BrainGames | Spain | — | 1 | — |
| Brainwash Gang | Spain | — | 5 | — |
| Brash Entertainment | United States | 2007 | 1 | 2 |
| Brass Token | Canada | 2017 | 1 | — |
| Brave At Night | United Kingdom | January 5, 2015 | 2 | 2 |
| Brave Giant | Serbia | 2013 | 24 | 5 |
| Brave Lamb Studio | Poland | — | 1 | — |
| Bravo Game Studios | Spain | — | 1 | 1 |
| BreakAway Games | United States | 1998 | 2 | 1 |
| Breakfall | Canada | 2011 | 1 | — |
| BreakFirst | France | 2009 | 1 | — |
| Bright Future | Germany | 2006 | 1 | — |
| Brinemedia | Ukraine | 2011 | 1 | 1 |
| BRIO | Sweden | 1884 | — | 2 |
| British Broadcasting Corporation | United Kingdom | 1927 | — | 1 |
| Broccoli | Japan | March 25, 1994 | 5 | 5 |
| Broderbund | United States | 1980 | 7 | 17 |
| Broken Rules | Austria | — | 1 | 1 |
| Brownies | Japan | November 15, 2012 | 1 | 1 |
| Brownmonster | United Kingdom | May 14, 2015 | 1 | 1 |
| Budcat Creations | United States | 2000 | 4 | — |
| Buka Entertainment | Russia | 1993 | 2 | 34 |
| Bullet-Proof Software | Japan | 1983 | 2 | 5 |
| Bullfrog Productions | United Kingdom | 1987 | 11 | — |
| Bungie | United States | May 1991 | 12 | 7 |
| Bunnyhug | United Kingdom | March 27, 2019 | 1 | — |
| Burning Goat | Brazil | 2020 | 2 | 1 |
| Burut CT | Russia | — | 1 | — |
| Bushiroad | Japan | 2007 | 1 | 8 |
| Bushiroad Games | Japan | — | — | 2 |