| T-Enterprise | Glasgow | — | — |
| T-Time Technology | New Taipei City | April 11, 1992 | video game industry |
| Tactics | Japan | 1997 | — |
| Tag Games | Dundee | 2006 | — |
| Take-Two Interactive | New York City | 1993 | video game industry |
| Takeru | Drive Slow | — | video game industry |
| Takumi Corporation | Shinjuku | 1994 | video game industry |
| Takuyo | Yokosuka | February 1991 | video game industry |
| TallBoys | — | — | video game industry |
| TalonSoft | Baltimore | 1995 | video game industry |
| Tan Ton Nerw | — | — | video game industry |
| Tandy Corporation | Fort Worth | 1919 | video game industry |
| Tango Gameworks | Shibaura | March 2010 | video game industry |
| Tantalus Media | Melbourne | 1994 | video game industry |
| Target Games | Stockholm | 1980 | tabletop role-playing game |
| Tasuke | Tokyo | February 2002 | — |
| TDK Recording Media Europe, S.A. | Windhof | — | — |
| Team ADOM | Witten | 2019 | video game industry |
| Team Arcana | — | — | video game industry |
| Team Hoi | — | 1988 | — |
| Team Ladybug | — | — | video game industry |
| Team Meat | Santa Cruz | — | — |
| Team Ninja | Tokyo | 1995 | video game industry |
| Team Shanghai Alice | — | 1995 | video game industry |
| Team Soda | — | — | video game industry |
| Team17 | Wakefield | December 1990 | — |
| Technical Education Research Centers | — | 1965 | — |
| Techno-Top | — | May 1999 | — |
| TechnoBrain | Kyoto Prefecture | January 13, 1994 | — |
| Technosoft | Sasebo | February 1980 | video game industry |
| Technōs Japan | Tokyo | December 1981 | video game industry |
| TecMagik | Greater London | — | — |
| Tectoy | São Paulo | 1987 | video game industry |
| Teknopiste | — | 1969 | video game industry |
| Telecomsoft | London | 1984 | — |
| Telegames | Gun Barrel City | — | video game industry |
| Telltale Games | San Rafael | July 2004 | video game industry |
| Templar Studios | — | 1997 | video game industry |
| Tengen | Milpitas | 1987 | video game industry |
| TENKY | Setagaya | December 14, 1989 | video game industry |
| Tequila Mobile | Wrocław | December 27, 2007 | video game industry |
| Terahard | Athens, London | 2012 | — |
| Terrible Posture Games | — | — | video game industry |
| Terrible Toybox | Seattle | December 2, 2015 | video game industry |
| Texelworks | Cluj-Napoca | — | video game industry |
| Tha Ltd. | — | — | video game industry |
| Thalamus Ltd | — | 1986 | — |
| Thalion Software | Gütersloh | 1988 | video game industry |
| That Silly Studio | Sheffield | December 7, 2016 | — |
| The Adventure Workshop | — | 1992 | — |
| The Assembly Line | United Kingdom | 1989 | — |
| The Behemoth | San Diego | 2003 | video game industry |
| The Chinese Room | Brighton | 2007 | — |
| The Code Monkeys | Dewsbury | 1988 | — |
| The Dairymen | Huntingdon | September 26, 2000 | — |
| The Game Bakers | Montpellier | August 18, 2010 | video game industry |
| The Game Creators | Macclesfield | 1999 | — |
| The Game Designers Studio | — | June 22, 1999 | video game industry |
| The Game Factory | Aarhus | November 6, 1997 | video game industry |
| The Gentlebros | — | 2015 | video game industry |
| The Hidden | — | — | — |
| The Iconfactory | Greensboro | 1996 | video game industry |
| The Initiative | Santa Monica | — | video game industry |
| The Learning Company | Cedar Rapids, San Francisco | 1980 | video game industry |
| The Lego Group | Billund | 1932 | video game industry |
| The MIX Games | — | May 24, 2021 | video game industry |
| The Molasses Flood | Cambridge | November 5, 2014 | video game industry |
| The New York Times | New York Times Building | September 18, 1851 | publishing |
| The New York Times Company | New York Times Building, New York City | September 18, 1851 | journalism |
| The Nuttery Entertainment | — | 2016 | video game industry |
| The Parasight | Kraków | — | video game industry |
| The Pixel Hunt | Paris | January 24, 2014 | computer programming |
| The Pokémon Company | Roppongi Hills Mori Tower | April 23, 1998 | — |
| The Sales Curve | London | 1988 | — |
| The Sims Studio | Redwood City | 2006 | video game industry |
| The Walt Disney Company | Burbank | October 16, 1923 | tourism industry |
| The Walt Disney Company (Japan) | Japan | 1959 | — |
| The Whole Experience | — | — | video game industry |
| Thin Chen Enterprise | Taipei | 1988 | video game industry |
| THQ | Agoura Hills, California | April 1990 | video game industry |
| THQ Nordic | Vienna | 2011 | video game industry |
| Three Fields Entertainment | Petersfield | 2014 | — |
| Three-Sixty Pacific | Bryan | 1987 | video game industry |
| TiGames | — | — | video game industry |
| TikGames | San Mateo | 2002 | video game industry |
| Tilted Mill Entertainment | Framingham | 2001 | video game industry |
| Tilting Point | — | 2012 | video game industry |
| Time Galleon | — | 2020 | — |
| Time Warner Interactive Ltd. | Northampton | September 23, 1988 | — |
| Timelock Studio | — | 2022 | — |
| Tin Can Studio | Lyon | July 20, 2019 | video game industry |
| Tindalos Interactive | Paris | May 5, 2010 | computer programming |
| Tinymoon | Madrid | — | video game industry |
| Titus Interactive | Montfermeil, Lagny-sur-Marne | 1985 | video game industry |
| TML Studios | Erfurt | 2004 | video game industry |
| TNX | Takanawa | October 6, 2006 | video game industry |
| Toadman Interactive | — | 2013 | video game industry |
| Toaplan | Tokyo | 1984 | video game industry |
| Toei Animation | Nakano | January 23, 1948 | video game industry |
| Toge Productions | Jakarta | January 20, 2009 | video game industry |
| Tokai Communications | Shizuoka | March 18, 1977 | video game industry |
| Tomcat System | Tokyo | March 6, 1991 | video game industry |
| Tonic Games | Randers | November 3, 2005 | — |
| Tonkin House | Japan | 1988 | video game industry |
| Top Hat Studios | — | — | — |
| Toplitz Productions | Irdning | — | video game industry |
| Tortuga Team | — | — | — |
| Tose Co. | Kyoto | November 1979 | video game industry |
| Towa Chiki | Tokyo | 1986 | video game industry |
| Toybox Inc. | Shinjuku | August 10, 2011 | video game industry |
| Toylogic | — | December 2006 | video game industry |
| Tradewest | Corsicana | 1986 | video game industry |
| Trainwreck Labs | — | — | — |
| Transhuman Design | Warsaw | — | video game industry |
| Translimit | Sendagaya | — | information technology |
| Trapped Nerve Games | Brighton | September 21, 2010 | — |
| Traveller's Tales | Knutsford | 1989 | — |
| Treasure | Nakano | June 19, 1992 | video game industry |
| Treco | Tokyo | — | video game industry |
| TreesPlease Games | — | September 24, 2019 | — |
| Treyarch | Santa Monica | 1996 | video game industry |
| Tri Synergy | Dallas | 1996 | video game publisher |
| Tri-Ace | Tokyo | March 16, 1995 | video game industry |
| Triangle Factory | Ghent | January 25, 2010 | video game industry |
| Triangle Studios | Leeuwarden | 2005 | video game industry |
| Tribe Games | Saint Paul | 2009 | video game industry |
| Tribetoy | San Francisco | 2008 | video game industry |
| TriBit Studio | — | — | video game industry |
| Trine Games | Mumbai | 2006 | video game industry |
| Triumph Studios | Delft | 1997 | video game industry |
| Troglobytes Games | Barcelona | — | video game industry |
| Troika Games | Irvine | 1998 | video game industry |
| Tru Blu Entertainment | Punchbowl | 1999 | video game industry |
| Tsunami Games | — | 1991 | video game industry |
| TT Fusion | Wilmslow | 2006 | — |
| TT Games | Maidenhead | 2005 | — |
| TT Games Publishing | London | 2004 | video game industry |
| TT Games Studios Ltd. | — | — | — |
| Tummy Games | Novi Sad | — | video game industry |
| Tunnel Vision Games | Aalborg | 2013 | video game industry |
| Tunnel Vision Studio | Rome | 2020 | video game industry |
| Turbo Tape Games | Bergen | 2008 | video game industry |
| Turbulenz | Guildford | 2009 | — |
| Twilight | — | — | — |
| Twin Otter Studios | Austin | November 14, 2020 | video game industry |
| Twisted Dragon Media | Apex | — | video game industry |
| Twisted Pixel Games | Austin | 2006 | video game industry |
| Two Point Studios | Farnham | 2016 | — |
| Typhoon Games | Hong Kong | 2001 | video game industry |