| Synergistic | Developer | |
| Synergistic Software | DeveloperPublisher | |
| Synergistic Software, Inc. | Developer | |
| Synergistic Solar | Publisher | |
| Synergy | Publisher | |
| Synergy (Andrew Severn, Peter Austin, Sonic Graffiti, Tau Zero) | Developer | |
| Synergy (Charles Goodwin) | Developer | |
| Synergy Inc. | DeveloperPublisher | |
| Synergy Interactive | Publisher | |
| Synergy Interactive Crop. | Publisher | |
| Synergy Studios | Developer | |
| Synergy's Forge | Developer | |
| Synergy, Inc. | DeveloperPublisher | |
| Synergy-moe | Developer | |
| Synetic | DeveloperPublisher | |
| Synfoniz | Developer | |
| Syngelsa | Developer | |
| Synokoria | Developer | |
| Synset Games | Developer | |
| SynthOveride | Developer | |
| SyntheOtaku | Developer | |
| Syntheon | Developer | |
| Synthetic Dimensions | Developer | |
| Syoudre | Developer | |
| Sypher | Developer | |
| Syphisprod | Developer | |
| Syphonx | Developer | |
| SyrStudios | Developer | |
| Syringa Vulgaris | Developer | |
| Syriph | Developer | |
| Syrox Developments | DeveloperPublisher | |
| Syrrann | Developer | |
| Syrup Pirates | Developer | |
| Syrus Turner | Developer | |
| Syscom | DeveloperPublisher | |
| Syscom Entertainment | Developer | |
| Syscom EntertainmentJP | Publisher | |
| Syscom JP | Publisher | |
| SyscomJP | Publisher | |
| Sysoft | Developer | |
| System 3 | DeveloperPublisher | |
| System 3 (EU) | Publisher | |
| System 3 Software | DeveloperPublisher | |
| System 3EU | Publisher | |
| System 3PAL | Publisher | |
| System 4 | Publisher | |
| System 4 Software | Publisher | |
| System Applied Technology | Developer | |
| System Create | DeveloperPublisher | |
| System Era Softworks | DeveloperPublisher | |
| System Erasure | DeveloperPublisher | |
| System House Oh! | DeveloperPublisher | |
| System Prisma | Developer | |
| System Sacom | DeveloperPublisher | |
| System Soft | DeveloperPublisher | |
| System Supply N-Tech | Developer | |
| System Ten | Publisher | |
| System Vision | Developer | |
| SystemLogoff | Developer | |
| SystemSoft | DeveloperPublisher | |
| SystemSoft Alpha | DeveloperPublisher | |
| SystemSoft AlphaJP | Publisher | |
| Systematics | Developer | |
| Systemic Games | Developer | |
| Systemsoft Beta | Publisher | |
| Syupro-DX | Developer | |
| Sywedra | Developer | |
| Szabika | Developer | |
| Szivacs | Developer | |
| SzymonPL188 Dev | Developer | |
| SzynalM | Developer | |
| Séraphin Gaillard | Developer | |
| Sílvia Cavadas | Developer | |
| Sørb | Developer | |
| Sōgō Business Assist | DeveloperPublisher | |
| T Allen Studios | Developer | |
| T B Clark | Developer | |
| T Studio Games | Developer | |
| T&E Soft | DeveloperPublisher | |
| T&E Soft (JP) | Publisher | |
| T&E SoftJP | Publisher | |
| T&E Software | DeveloperPublisher | |
| T&J Kauppinen | Developer | |
| T'K FjBn | Developer | |
| T-Bo Games | Developer | |
| T-Bone Independent Software Solutions | Developer | |
| T-Dog eXtreme | Developer | |
| T-Low | Developer | |
| T-ReXx | Developer | |
| T-Rex Games | Developer | |
| T-Rex Interactive | Developer | |
| T-TIME Technology | Publisher | |
| T-Time Technology | Developer | |
| T-rex Productions | Developer | |
| T-time Technology | Publisher | |
| T. J. Stoker | Developer | |
| T. Petrichor | Developer | |
| T.I | Developer | |
| T.L. Gale & Ivan Manley | Developer | |
| T.N. Newton | Developer | |
| 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 | |