| G CHOICE | — | 2001 | video game industry |
| G-Craft | — | — | video game industry |
| G5 Entertainment | Stockholm | 2001 | game industry |
| Gaddy Games | Palaiseau | 2012 | video game industry |
| Gaijinworks | Redding | 2006 | video game industry |
| GalaxyTrail | — | 2011 | video game industry |
| Galdra Studios | — | — | video game industry |
| Game Factory Interactive | Nicosia | 2003 | video game industry |
| Game Freak | Setagaya | April 26, 1989 | video game industry |
| Game Nacional | — | — | video game industry |
| Game Source Entertainment | Hong Kong | 2006 | video game industry |
| Game Studio | — | — | video game industry |
| Gameblyr | Boston | 2013 | video game industry |
| GameChanger Studio | — | 2013 | video game industry |
| Gamecom Team | Jakarta | 2014 | video game industry |
| GameCrafterTeam | Phuket | — | video game industry |
| Gameforge | Karlsruhe | December 2003 | video game industry |
| GameHouse | Seattle | 1991 | video game industry |
| Gamelab | — | 2000 | video game industry |
| Gameloft | Paris | 1999 | video game publishing |
| Gameloft Iberica | — | — | video game industry |
| GameMill Publishing | Edina | 2001 | video game industry |
| Games Farm | — | — | video game industry |
| Games Workshop | Nottingham | 1975 | — |
| GameTek | North Miami Beach | 1987 | video game industry |
| GameTomo | Tokyo | — | video game industry |
| GAMFS N | — | December 17, 2021 | video game industry |
| Gaming Company | London | October 23, 2014 | — |
| Gaming Minds Studios | Gütersloh | 2009 | video game industry |
| Gamos | — | 1991 | — |
| Gamu ry | — | — | — |
| Gang of Five | — | — | — |
| Gangbusters | — | November 28, 2018 | — |
| Gaps | Japan | 1994 | video game industry |
| Garoa Studios | Rio de Janeiro | 2019 | video game industry |
| Gathering of Developers | Texas | 1998 | video game industry |
| GD Studio | Lidingö | March 18, 2012 | — |
| Gears for Breakfast | — | — | — |
| General Interactive Co. | — | 2016 | video game industry |
| Genius Sonority | Chūō | June 2002 | video game industry |
| Geometric Interactive | Copenhagen | — | video game industry |
| GFI Russia | Moscow | 1996 | video game industry |
| Ghost Town Games | — | March 6, 2015 | — |
| Ghostlight | Braintree | 2004 | video game industry |
| Giant Squid | West Los Angeles | 2013 | video game industry |
| Giants Software | Zurich | 2004 | video game industry |
| Giga | Japan | July 9, 1993 | video game industry |
| Global A Entertainment | Japan, Minato, Musashino | September 12, 1997 | video game industry |
| Global VR | San Jose | 1998 | video game industry |
| Glodia | — | — | video game industry |
| Glowfish Interactive | Kortrijk | — | video game industry |
| Glu Mobile | San Francisco | 2005 | video game industry |
| Gogii Games | Moncton | 2006 | video game industry |
| GolemLabs | — | 2000 | video game industry |
| Good Gate Media | Cardiff | 2018 | — |
| Good Smile Company | Sumida | 2001 | — |
| Goodgame Studios | Hamburg | 2009 | — |
| Google | Googleplex | September 4, 1998 | software industry |
| Got Game Entertainment | Weston | — | video game industry |
| Gotcha Gotcha Games | Tokyo | September 2020 | video game industry |
| Gottlieb | San Francisco | 1997 | video game industry |
| Grandslam Entertainments | — | 1987 | — |
| Graphic Research Co., Ltd. | Chūō | May 1982 | video game industry |
| Graphic State Games | Warwickshire | 2000 | video game industry |
| Grasshopper Manufacture | Chiyoda | March 30, 1998 | video game industry |
| Great Detail Ltd | — | — | — |
| Green Lava Studios | — | — | video game industry |
| Grey Alien Games | Bridport | 2004 | — |
| Grezzo | Shibuya | December 2006 | video game industry |
| Grimbart Tales | Kaiserslautern | 2015 | video game industry |
| Grimlore Games | Munich | — | video game industry |
| Griptonite Games | Kirkland | 1994 | video game industry |
| Groove Games | Toronto | 2001 | video game industry |
| GROOVER | — | — | video game industry |
| Ground Shatter | Bristol | May 23, 2014 | — |
| Grounding | Shibuya | September 7, 2007 | — |
| Groundspeak | Seattle | September 2000 | — |
| Grubby Hands Limited | United Kingdom | May 2011 | — |
| Grumpyface Studios | Phoenix | — | video game industry |
| Grupo Televisa | Mexico City | January 8, 1973 | television |
| Gryph Frontier | Downtown Core | May 9, 2022 | — |
| GSP Games | — | — | — |
| Guerrilla Cambridge | Cambridge | 1997 | — |
| Gun Interactive | Lexington | — | video game industry |
| Gunjin Games Limited | Brighton | June 2014 | — |
| Gusto Games | — | — | — |
| Guyzware Inc. | Ebisu | March 3, 2006 | — |