| T.O.M. | Developer | |
| T.P.M. | Developer | |
| T.R.M.V | Developer | |
| T.T.S (JP) | Publisher | |
| T.Tang | Developer | |
| T.W. Games Ltd | Developer | |
| T.Y.Brains | Developer | |
| T19Games | Developer | |
| T1dus07 | Developer | |
| T1mBer | Developer | |
| T2 | DeveloperPublisher | |
| T3T0L4 | Developer | |
| T3triez | Developer | |
| T3tsuya | Developer | |
| T4 Interactive | Developer | |
| T4TGames | Developer | |
| T9 Studios | Developer | |
| TACS Games | DeveloperPublisher | |
| TAD | Developer | |
| TAD Corp | Publisher | |
| TAD Corporation | Publisher | |
| TAFKAF | Developer | |
| TAG | DeveloperPublisher | |
| TAG Computer Games | Developer | |
| TAG Computer Games (Adam Waring, Paul Hiley) | Developer | |
| TAG Computer Games (Gareth Baker, Paul Hiley) | Developer | |
| TAG Computer Games (Tony Warriner) | Developer | |
| TAG Computer Games (Tony Warriner, Paul Hiley) | Developer | |
| TAKERU | Publisher | |
| TANISHK_VASHISTH | Developer | |
| TANTRUM games | Developer | |
| TAO | Developer | |
| TAYLOR SWIETANSKI🌱 | Developer | |
| TBS | Publisher | |
| TBit Coding | Developer | |
| TC | Developer | |
| TCH | Publisher | |
| TDK | DeveloperPublisher | |
| TDK Core | DeveloperPublisher | |
| TDK Interactive | Publisher | |
| TDK Mediactive | DeveloperPublisher | |
| TDK Mediactive EU | Publisher | |
| TDK MediactiveEU | Publisher | |
| TDK MediactiveNA | Publisher | |
| TDK Recording Media Europe S.A. | Developer | |
| TDS Studios | Developer | |
| TDickson | Developer | |
| TEAM JUCAJORO | Developer | |
| TEN | DeveloperPublisher | |
| TEN Institute | DeveloperPublisher | |
| TENBIRDS | Developer | |
| TERA14 | Developer | |
| TERNOX | DeveloperPublisher | |
| TESSERACT GAMES | Developer | |
| TFL Studios | Publisher | |
| TFWCR | Developer | |
| TGDeerGirl | Developer | |
| TGGAMESON | Developer | |
| TGL | DeveloperPublisher | |
| TGNKK | Developer | |
| TGorder | Developer | |
| THAIS ARIAS | Developer | |
| THAXTERIA | Developer | |
| THC_games | Developer | |
| THE A-Z COLLECTION | Developer | |
| THE CREATOR | Developer | |
| THE DABS | Developer | |
| THE SHORE | Developer | |
| THE0R | Developer | |
| THE_T_V1RUS | Developer | |
| THOMAS BRETT | Developer | |
| THQ | DeveloperPublisher | |
| THQ (EU) | Publisher | |
| THQ Australia | Developer | |
| THQ Digital Studios UK | Developer | |
| THQ Digital Warrington | Developer | |
| THQ EU | Publisher | |
| THQ Inc. | Publisher | |
| THQ NA | Publisher | |
| THQ NA/EU | Publisher | |
| THQ Nordic | DeveloperPublisher | |
| THQ San Diego | Developer | |
| THQ Software | Developer | |
| THQ Studio Australia | Developer | |
| THQ Valusoft | Publisher | |
| THQ Wireless | DeveloperPublisher | |
| THQ and Nickelodeon | Publisher | |
| THQAU | Publisher | |
| THQEU | Publisher | |
| THQEU,KO,NA | Publisher | |
| THQEU,NA | Publisher | |
| THQKO | Publisher | |
| THQNA | Publisher | |
| THQNA/PAL | Publisher | |
| THQPAL | Publisher | |
| THQPAL/NA | Publisher | |
| THQR Inc. | Developer | |
| TICUnivali2017 | Developer | |
| TINYWARE GAMES | Developer | |
| TJ | Developer | |