| Wadjet Eye Games | United States | 2006 | 5 | 8 |
| Waffle | Japan | — | 1 | 1 |
| Wahlap Technology | People's Republic of China | — | — | 4 |
| Wahoo Studios | United States | 2001 | 1 | — |
| Waking Oni Games | United States | — | 1 | — |
| Walkabout Games | — | — | — | 2 |
| Walt Disney Animation Studios | United States | October 16, 1923 | — | — |
| Walt Disney Records | United States | 1956 | — | 1 |
| Wanadoo | France | 1995 | — | 1 |
| Wanako Studios | Chile | 2002 | 5 | — |
| Warashi | Japan | 1995 | 2 | 1 |
| Wargaming | Cyprus | August 2, 1998 | 5 | 8 |
| Wargaming Seattle | United States | — | 7 | — |
| Warhorse Studios | Czech Republic | 2011 | 1 | 1 |
| Warner Bros. Entertainment | United States | April 4, 1923 | — | 2 |
| Warner Bros. Games | United States | 2004 | 3 | 66 |
| WARP | Japan | March 1994 | 3 | — |
| WayForward Technologies | United States | 1990 | 24 | 12 |
| WB Games Boston | United States | 1994 | 1 | — |
| WB Games Montréal | Canada | 2010 | 2 | — |
| Weakfish Studio Publishing | Turkey | — | — | 6 |
| Webfoot Technologies | United States | 1993 | 4 | — |
| Webzen Games | — | April 28, 2000 | 1 | — |
| WeirdBeard | Netherlands | October 23, 2007 | 2 | 1 |
| Wellore | Russia | 2008 | 3 | — |
| Weltenbauer. | Germany | 2008 | 1 | — |
| Weltenschmiede | Germany | 1990 | 2 | — |
| Westone Bit Entertainment | Japan | May 1986 | 3 | — |
| Westwood Studios | United States | 1992 | 19 | 2 |
| WFS | Japan | February 21, 2014 | 1 | 1 |
| Whale Rock Games | Ukraine | — | — | 1 |
| Whalebox Studio | Russia | 2012 | 6 | 1 |
| WhaleFood Games | United States | 2013 | 1 | — |
| Whiptail Interactive | United States | — | — | 4 |
| Whirlpool | Japan | 2006 | 5 | — |
| White Keyframe | Germany | 2019 | 1 | 1 |
| White Paper Games | United Kingdom | June 28, 2012 | 1 | — |
| Whiteboard Games | Argentina | — | 1 | — |
| WhiteMoon Dreams | United States | 2007 | 1 | — |
| Whitethorn Games | United States | 2016 | 1 | 13 |
| Whoopee Camp | Japan | 1997 | 2 | 2 |
| Why so serious | Japan | — | 1 | 1 |
| Wicked Witch Software | — | 1999 | 7 | — |
| Wide Right Interactive | United States | 2017 | 3 | 3 |
| WideScreen Games | France | 1999 | 1 | — |
| Wild River Games | Germany | — | 2 | 5 |
| Wildboy Studios | New Zealand | 2017 | 1 | — |
| WildSphere | Spain | — | 4 | 3 |
| WildTangent | United States | 1998 | 3 | 2 |
| WildWorks | United States | — | 1 | — |
| Will Winn Games | United States | 2020 | 1 | 1 |
| WillPlus. | Japan | August 20, 2010 | 2 | 2 |
| Windmill | Japan | 2002 | 1 | 1 |
| Winkysoft | Japan | 1983 | 7 | 1 |
| Winning Entertainment Group | Japan | October 20, 1987 | 35 | 24 |
| Winter Wolves | Italy | — | 5 | 4 |
| Wired Productions | United Kingdom | May 15, 2008 | — | 7 |
| Wishfully | Sweden | 2018 | 2 | — |
| Witch Beam | Australia | May 15, 2013 | 1 | — |
| WITCHCRAFT inc. | Japan | January 11, 2008 | 1 | — |
| Wizarbox | France | January 31, 2003 | 1 | — |
| Wizard Games | Canada | — | 1 | 1 |
| Wizards of the Coast | United States | 1990 | — | 2 |
| WizardWorks Software | United States | August 21, 1980 | — | 9 |
| WMS Industries | United States | 1974 | 1 | 4 |
| Wobbly Tooth | Japan | — | 5 | 5 |
| Woblyware | Finland | 2009 | 1 | — |
| Wolf & Wood | United Kingdom | January 28, 2015 | 2 | — |
| Wolfire Games | United States | 2003 | 1 | 1 |
| Wolfy | France | October 10, 2018 | 1 | 1 |
| Wonderful Lasers | Canada | November 2014 | 1 | — |
| Wondernaut Studio | Brazil | 2020 | 1 | — |
| WonderPlanet | Japan | September 3, 2012 | — | 1 |
| Wonderscope | Sweden | — | 1 | — |
| Woodland Games | Poland | — | 2 | — |
| Working Designs | United States | 1986 | — | 4 |
| World Food Programme | Italy | December 19, 1961 | — | 1 |
| World Forge | Russia | 2004 | 2 | — |
| World of Wonder | United States | 1991 | — | 1 |
| World's Edge | — | — | 2 | — |
| Worldwalker Games | United States | — | 1 | 1 |
| WorldWideSoftware | Japan | 1996 | 4 | — |
| Wreck Tangle Games | United Kingdom | — | 1 | 1 |
| WSOY | Finland | 1878 | — | 2 |