| 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 | |