| T-ARTS | Japan | February 9, 1988 | — | 2 |
| T-Bull | Poland | 2010 | 1 | 1 |
| T-Time Technology | Taiwan | April 11, 1992 | — | — |
| Tactics | Japan | 1997 | 1 | — |
| Tactile Games | Denmark | 2009 | 1 | 1 |
| Tag Games | United Kingdom | 2006 | 2 | — |
| Taito | Japan | August 24, 1953 | 61 | 86 |
| Takara | Japan | September 17, 1955 | 3 | 24 |
| Take Two Interactive GmbH | Germany | — | — | 2 |
| Take-Two Interactive | United States | 1993 | 1 | 25 |
| Take-Two Licensing | United States | 2004 | — | 2 |
| Takeru | Japan | — | 1 | 1 |
| Takumi Corporation | Japan | 1994 | 4 | — |
| Takuyo | Japan | February 1991 | 7 | 7 |
| TaleWorlds | Turkey | 2005 | 4 | 2 |
| TallBoys | Russia | — | 1 | 1 |
| TalonSoft | United States | 1995 | — | 1 |
| Tamsoft | Japan | June 26, 1992 | 35 | — |
| Tandem Verlag | Germany | 1994 | — | — |
| Tandy Corporation | United States | 1919 | — | 1 |
| Tango Gameworks | Japan | March 2010 | 4 | — |
| Tantalus Media | Australia | 1994 | 12 | — |
| Tanuki Game Studio | Spain | 2011 | 1 | — |
| Tapulous | United States | 2008 | 4 | — |
| Targem Games | Russia | 2002 | 3 | — |
| Target Games | Sweden | 1980 | 2 | — |
| Tarsier Studios | Sweden | 2004 | 2 | 1 |
| Tasto Alpha | Japan | June 3, 2019 | 1 | — |
| Tasuke | Japan | February 2002 | 1 | 1 |
| Tate Multimedia | Poland | 2000 | 5 | 2 |
| TATI Mixedia | Sweden | 1991 | 3 | — |
| TATSUJIN | Japan | May 2017 | 2 | 1 |
| Tatsumi | Japan | August 25, 1970 | 1 | 1 |
| Taxan | United States | July 1981 | — | 2 |
| TDK | Japan | December 7, 1935 | — | 1 |
| TDK Recording Media Europe, S.A. | Luxembourg | — | — | 1 |
| Tea Monster Games | Canada | — | 1 | 1 |
| Team ADOM | Germany | 2019 | 1 | — |
| Team GrisGris | Japan | 1998 | 2 | — |
| Team Hoi | Netherlands | 1988 | 8 | — |
| Team KwaKwa | Switzerland | — | 1 | — |
| Team Ladybug | Japan | — | 1 | — |
| Team Meat | United States | — | 1 | 1 |
| Team Ninja | Japan | 1995 | 51 | — |
| Team Reptile | Netherlands | September 2011 | 2 | 2 |
| Team Salvato | United States | 2017 | 1 | — |
| Team Silent | Japan | 1997 | 3 | — |
| Team Soda | People's Republic of China | — | 1 | — |
| Team Soho | United Kingdom | 1994 | 2 | — |
| Team SolEtude | Italy | — | 2 | 2 |
| Team WIBY | Australia | 2018 | 1 | — |
| Team17 | United Kingdom | December 1990 | 39 | 53 |
| Team6 Game Studios | Netherlands | 2001 | 6 | — |
| TeamKill Media | United States | 2016 | 1 | 1 |
| Tech Arts Inc. | Japan | October 1996 | 1 | 2 |
| Technical Education Research Centers | United States | 1965 | 1 | — |
| Technical Group Laboratory | Japan | July 1984 | — | 3 |
| Techno-Top | Japan | May 1999 | 1 | 1 |
| TechnoBrain | Japan | January 13, 1994 | 1 | 1 |
| Technosoft | Japan | February 1980 | 6 | 4 |
| Technōs Japan | Japan | December 1981 | 16 | 13 |
| Tecmo | Japan | July 31, 1967 | 33 | 45 |
| Tectoy | Brazil | 1987 | 6 | 6 |
| Teggno Interactive | Brazil | 2021 | 1 | — |
| Teknopiste | Finland | 1969 | — | — |
| Telegames | United States | — | 1 | 3 |
| Telenet Japan | Japan | 1983 | 7 | 6 |
| Telltale Games | United States | July 2004 | 39 | 22 |
| Telstar Electronic Studios | United Kingdom | 1993 | — | 1 |
| Templar Studios | United States | 1997 | 1 | — |
| Tencent | People's Republic of China | November 12, 1998 | — | 6 |
| Tencent Games | People's Republic of China | 2003 | 1 | 5 |
| Tender Claws | United States | 2014 | 3 | 4 |
| Tengen | United States | 1987 | 2 | 6 |
| TENKY | Japan | December 14, 1989 | 1 | — |
| Tequila Mobile | Poland | December 27, 2007 | 1 | 1 |
| Teravision Games | Colombia | — | 1 | — |
| Terminal Reality | United States | 1994 | 8 | — |
| Terraglyph Interactive Studios | United States | 1994 | 1 | — |
| Terrible Posture Games | United States | — | 4 | 4 |
| Terrible Toybox | United States | December 2, 2015 | — | 1 |
| Terzio Verlag | Germany | 1997 | — | 7 |
| Tessera Studios | Spain | 2017 | 2 | — |
| Texelworks | Romania | — | 1 | — |
| Tha Ltd. | Japan | — | 1 | — |
| Thalamus Ltd | United Kingdom | 1986 | — | 2 |
| Thalion Software | Germany | 1988 | 7 | 10 |
| That Silly Studio | United Kingdom | December 7, 2016 | 1 | — |
| The 3DO Company | United States | September 12, 1991 | 8 | 25 |
| The Adventure Company | Canada | 2002 | — | 12 |
| The Adventure Workshop | United Kingdom | 1992 | — | 1 |
| The Arcade Crew | France | 2018 | — | 3 |
| The Assembly Line | United Kingdom | 1989 | 1 | — |
| The Behemoth | United States | 2003 | 3 | 2 |
| The Bergson's Games Studios | Brazil | — | 1 | 1 |
| The Bitmap Brothers | United Kingdom | 1987 | 3 | — |
| The Chinese Room | United Kingdom | 2007 | 2 | — |
| The Coalition | Canada | February 2010 | 5 | — |
| The Code Monkeys | United Kingdom | 1988 | 2 | — |
| The Dairymen | United Kingdom | September 26, 2000 | — | 1 |
| The Digital Village | United Kingdom | 1994 | 1 | — |
| The Farm 51 | Poland | 2005 | 5 | 2 |
| The Fighter Collection | United Kingdom | — | — | 1 |
| The Game Bakers | France | August 18, 2010 | 1 | — |
| The Game Creators | United Kingdom | 1999 | — | — |
| The Game Designers Studio | Japan | June 22, 1999 | 1 | — |
| The Game Factory | Denmark | November 6, 1997 | — | 3 |
| The Gentlebros | Singapore | 2015 | 3 | 1 |
| The Iconfactory | United States | 1996 | 1 | — |
| The Initiative | United States | — | 1 | — |
| The Knights of Unity | Poland | 2015 | 1 | 2 |
| The Label | United States | 2016 | — | 2 |
| The Learning Company | United States | 1980 | 7 | 6 |
| The Lego Group | Denmark | 1932 | 2 | 15 |
| The Men Who Wear Many Hats | — | February 2012 | 1 | 1 |
| The MIX Games | United States | May 24, 2021 | — | 1 |
| The Molasses Flood | United States | November 5, 2014 | 1 | 1 |
| The New York Times | United States | September 18, 1851 | 1 | — |
| The New York Times Company | United States | September 18, 1851 | — | 1 |
| The Nuttery Entertainment | Sweden | 2016 | 1 | — |
| The Outer Zone | Denmark | — | 1 | — |
| The Parasight | Poland | — | 1 | — |
| The Pixel Hunt | France | January 24, 2014 | 2 | 1 |
| The Pokémon Company | Japan | April 23, 1998 | 5 | 40 |
| The Pokémon Company International | United States | — | 1 | — |
| The Quantum Astrophysicists Guild | United States | May 17, 2012 | 1 | 8 |
| The Sales Curve | United Kingdom | 1988 | — | 3 |
| The Sims Studio | United States | 2006 | 4 | — |
| The Software Toolworks | United States | 1980 | 2 | 2 |
| The Vision Factory | Netherlands | 1993 | 2 | — |
| The Walt Disney Company | United States | October 16, 1923 | — | 1 |
| The Walt Disney Company (Japan) | Japan | 1959 | 1 | — |
| Thermite Games | People's Republic of China | July 10, 2020 | — | 4 |
| Thin Chen Enterprise | Taiwan | 1988 | 1 | 1 |
| Think Garage | Japan | 2005 | 1 | — |
| Thinking Rabbit | Japan | 1982 | 2 | — |
| THQ | United States | April 1990 | 9 | 151 |
| THQ Digital Studios UK | United Kingdom | 2003 | 3 | — |
| THQ Nordic | Austria | 2011 | 5 | 57 |
| THQ Nordic Mobile | Germany | 2000 | 6 | 15 |
| THQ Studio Australia | — | 2003 | 1 | — |
| THQ Wireless | United States | — | 1 | 2 |
| Three Fields Entertainment | United Kingdom | 2014 | 2 | 1 |
| Three Rings | Japan | October 19, 2010 | 3 | — |
| Three-Sixty Pacific | United States | 1987 | 2 | 2 |
| Throwback Entertainment | — | 2004 | — | 2 |
| Thunderful | Sweden | 2017 | — | 16 |
| Thunderful Development | Sweden | December 13, 2017 | 1 | — |
| Thylacine Studios | — | 2014 | 4 | — |
| Tiertex Design Studios | United Kingdom | 1987 | 5 | — |
| TiGames | People's Republic of China | — | 2 | 1 |
| Tiger Electronics | United States | 1978 | 1 | — |
| Tigon Studios | United States | 2002 | — | 1 |
| TikGames | United States | 2002 | 1 | 1 |
| Tilted Mill Entertainment | United States | 2001 | 3 | — |
| Time Galleon | Brazil | 2020 | — | 2 |
| Time Warner Interactive | United States | 1993 | 1 | 1 |
| Time Warner Interactive Ltd. | United Kingdom | September 23, 1988 | 1 | 1 |
| TimeGate Studios | United States | 1998 | 3 | 1 |
| Timelock Studio | — | 2022 | 2 | — |
| TiMi Studio Group | People's Republic of China | October 9, 2014 | 3 | — |
| Tin Can Studio | France | July 20, 2019 | 1 | 1 |
| Tindalos Interactive | France | May 5, 2010 | 2 | — |
| Tinimations | Norway | 2013 | 2 | 1 |
| Tiny Bull Studios | — | 2011 | 2 | — |
| Tinymoon | Spain | — | 1 | — |
| Titus Interactive | France | 1985 | 6 | 10 |
| TKO Software | United States | 2002 | 1 | — |
| TML Studios | Germany | 2004 | 9 | 2 |
| TNX | Japan | October 6, 2006 | 2 | — |
| Toaplan | Japan | 1984 | 21 | 7 |
| Toca Boca | Sweden | 2010 | 1 | 1 |
| Toei Animation | Japan | January 23, 1948 | — | 1 |
| ToeJam & Earl Productions | United States | 1989 | 3 | — |
| Toge Productions | Indonesia | January 20, 2009 | 5 | 11 |
| Toho | Japan | August 8, 1932 | 3 | 10 |
| Tokai Communications | Japan | March 18, 1977 | 1 | 1 |
| Tokuma Shoten | Japan | March 19, 1954 | — | 2 |
| Tom Create | Japan | October 1989 | 2 | 2 |
| Tomcat System | Japan | March 6, 1991 | 1 | — |
| Tommo Inc. | United States | 1989 | — | 2 |
| Tomy | Japan | March 2006 | 3 | 16 |
| Tonic Games | Denmark | November 3, 2005 | 1 | — |
| Tonkin House | Japan | 1988 | 2 | 6 |
| Top Hat Studios | United States | — | — | 14 |
| Toplitz Productions | Austria | — | — | 7 |
| Toppluva | Sweden | 2017 | 2 | — |
| TopWare Interactive | Germany | 1995 | 3 | 5 |
| Torn Banner Studios | Canada | 2011 | 1 | — |
| Tortuga Team | Russia | — | 3 | 3 |
| Torus Games | Australia | 1994 | 10 | — |
| Tose Co. | Japan | November 1979 | 59 | — |
| Toshiba EMI Ltd. | Japan | October 1973 | — | 1 |
| Total Mayhem Games | Netherlands | — | 4 | 4 |
| Totally Games | United States | 1984 | 16 | — |
| Touchstone Pictures | United States | February 15, 1984 | — | 1 |
| Towa Chiki | Japan | May 2, 1986 | — | 1 |
| Towa Chiki | Japan | 1986 | — | 1 |
| Toybox Inc. | Japan | August 10, 2011 | 2 | — |
| Toylogic | Japan | December 2006 | 2 | — |
| Toys for Bob | United States | 1989 | 14 | — |
| Tradewest | United States | 1986 | — | 9 |
| Trainwreck Labs | Canada | — | 3 | 3 |
| Transhuman Design | Poland | — | 1 | 1 |
| Translimit | Japan | — | 1 | 1 |
| Transmission Games | — | 1996 | 3 | — |
| Transposia | Belgium | 1994 | — | 5 |
| Trashmasters | Russia | — | 1 | — |
| Traveller's Tales | United Kingdom | 1989 | 29 | — |
| Treasure | Japan | June 19, 1992 | 9 | — |
| Treco | Japan | — | — | 2 |
| TREVA Entertainment | Germany | 2006 | — | 2 |
| Treyarch | United States | 1996 | 15 | — |
| Tri Synergy | United States | 1996 | — | 3 |
| Tri-Ace | Japan | March 16, 1995 | 12 | — |
| Tri-Crescendo | Japan | February 1999 | 3 | — |
| Triangle Factory | Belgium | January 25, 2010 | 2 | 2 |
| Triangle Studios | Netherlands | 2005 | 4 | — |
| Triband | Denmark | — | 3 | 2 |
| Tribe Games | United States | 2009 | 1 | — |
| Tribetoy | United States | 2008 | 1 | 1 |
| TriBit Studio | Italy | — | 1 | — |
| Tribute Games | Canada | 2011 | — | 1 |
| Triffix Entertainment | — | 1991 | 1 | — |
| Trine Game Studios | India | — | 1 | — |
| Trine Games | India | 2006 | 2 | — |
| Trinity Team | Italy | — | 1 | — |
| Trion Worlds | United States | January 10, 2005 | 1 | 1 |
| Triple Topping | Denmark | — | 2 | 2 |
| Triple.B.Titles | United States | — | 1 | — |
| Tripwire Interactive | United States | 2005 | 3 | 4 |
| Triskell Interactive | France | September 2014 | 3 | 2 |
| Triumph Studios | Netherlands | 1997 | 12 | 1 |
| Troglobytes Games | Spain | — | 1 | 1 |
| Troika Games | United States | 1998 | 1 | — |
| Tru Blu Entertainment | Australia | 1999 | — | 13 |
| Tsunami Games | United States | 1991 | 1 | — |
| TT Fusion | United Kingdom | 2006 | 6 | — |
| TT Games | United Kingdom | 2005 | 7 | 3 |
| TT Games Publishing | United Kingdom | 2004 | — | 1 |
| Tummy Games | Serbia | — | 1 | 1 |
| Tunnel Vision Games | Denmark | 2013 | 1 | — |
| Tunnel Vision Studio | Italy | 2020 | 1 | — |
| Turbo Button | — | — | 2 | 1 |
| Turbo Tape Games | Norway | 2008 | 1 | — |
| Turn 10 Studios | United States | 2001 | 8 | — |
| TV Asahi | Japan | October 15, 2013 | — | 1 |
| Twilight Frontier | Japan | — | 11 | 8 |
| Twin Otter Studios | United States | November 14, 2020 | 1 | — |
| Twin Sails Interactive | France | — | 1 | 8 |
| Twisted Dragon Media | United States | — | 1 | 1 |
| Twisted Pixel Games | United States | 2006 | 1 | — |
| Twitch Interactive | United States | September 18, 2006 | — | 1 |
| Two Point Studios | United Kingdom | 2016 | 1 | — |
| Two Tiny Dice | France | — | 1 | — |
| Two Tribes | Netherlands | 2000 | 5 | 2 |
| Tynesoft | — | 1983 | — | 2 |
| Type‐Moon | Japan | 2003 | 7 | 2 |
| Typhoon Games | — | 2001 | — | 2 |