| Thinking Cap Software | Publisher | |
| Thinking Frog Studios | Developer | |
| Thinking Machine Associates | DeveloperPublisher | |
| Thinking Rabbit | DeveloperPublisher | |
| Thinking Tools | Developer | |
| ThinkingMicrowave | Developer | |
| ThinkingStars | DeveloperPublisher | |
| Third Law Entertainment | Developer | |
| Third Law Interactive | Developer | |
| Third Party Software | Publisher | |
| Third Rock Games | Developer | |
| Third Wave Games | DeveloperPublisher | |
| Third Wire Productions | DeveloperPublisher | |
| Third-I Productions | Publisher | |
| ThirstyPenguin | Developer | |
| Thirty Three Games | Developer | |
| ThirtyThree | Developer | |
| ThirtysixLab | Developer | |
| This Side of Me | Developer | |
| ThisGooch | Developer | |
| ThisPersonDoesNotExist_Games | Developer | |
| Thob | Developer | |
| Thola studio | Developer | |
| ThomW | Developer | |
| Thomas | Developer | |
| Thomas B. Hardy | Developer | |
| Thomas Ball (computer scientist), | Developer | |
| Thomas Biskup | DeveloperPublisher | |
| Thomas Bowker | Developer | |
| Thomas Chassin | Developer | |
| Thomas Feichtmeir Cyangmou | Developer | |
| Thomas Gervraud | Developer | |
| Thomas Gittelbauer | Developer | |
| Thomas Guitton | Developer | |
| Thomas Haaks (Right Angle Games) | Developer | |
| Thomas Happ Games | DeveloperPublisher | |
| Thomas Huang | Developer | |
| Thomas L. | Developer | |
| Thomas Lean | Developer | |
| Thomas Lehnert | Developer | |
| Thomas Lessa | Developer | |
| Thomas Ling | Developer | |
| Thomas Manuel | Developer | |
| Thomas Martin | Developer | |
| Thomas Mathys | Developer | |
| Thomas Mazzaferro | Developer | |
| Thomas Moon Kang | Developer | |
| Thomas Nichols | Developer | |
| Thomas Noone & Patrick Noone | Developer | |
| Thomas Olsson | Developer | |
| Thomas Pytel | Developer | |
| Thomas Rodriguez | Developer | |
| Thomas Sjerps | Developer | |
| Thomas Sullivan | Developer | |
| Thomas Viktil | Developer | |
| Thomas and Steffen Dingel | Developer | |
| Thomas the Franque | Developer | |
| Thomas09 Games | Developer | |
| ThomasBradstreet | Developer | |
| ThomasMONNERIE | Developer | |
| ThomasPettus | Developer | |
| ThomasVanbo | Developer | |
| Thomasda | Developer | |
| Thomassu | Developer | |
| Thomasteste | Developer | |
| ThommazK | Developer | |
| Thompsonsoft | DeveloperPublisher | |
| Thomy75 | Developer | |
| Thong Nguyen | Developer | |
| Thoof | Developer | |
| Thor Computer Software | Publisher | |
| Thor Merlin Lervik | Developer | |
| ThorGameDev | Developer | |
| Thormbreak | Developer | |
| Thorn | Developer | |
| Thorn Dragon | Developer | |
| Thornbury Software | DeveloperPublisher | |
| Thornido | Developer | |
| Those Awesome Guys | Publisher | |
| Those Coded Lunatics | Developer | |
| Those Darn Kids | Developer | |
| Thought Cabinet | Developer | |
| Thought Train | Developer | |
| ThoughtBread | Developer | |
| Thousand Games | Developer | |
| Thousand Stars Studio | Developer | |
| ThousandYrGames | Developer | |
| Thrasher08 | Developer | |
| Thraxx Media | Developer | |
| Threaks | DeveloperPublisher | |
| Three Donkeys LLC | DeveloperPublisher | |
| Three Fields Entertainment | DeveloperPublisher | |
| Three Gates | DeveloperPublisher | |
| Three Kiddos STUDIOS | Developer | |
| Three Moon Games | Developer | |
| Three One Zero | Developer | |
| Three Rings | Developer | |
| Three Rings Design | DeveloperPublisher | |
| Three Rivers Software | Developer | |
| Three Spirits | Developer | |
| Three Times Infinite | Developer | |
| Three-Sixth Pacific | Publisher | |
| Three-Sixty Pacific | DeveloperPublisher | |
| Three-legged crow | Developer | |
| ThreeAnglePie | Developer | |
| ThreePixels | Developer | |
| Three_dots | Developer | |
| Threeli | Developer | |
| Threewave Software | Developer | |
| Threshold Seven | Developer | |
| Threstle | Developer | |
| Threye Interactive | DeveloperPublisher | |
| ThriftUterus | Developer | |
| ThrillDaWill | Developer | |
| Thrinmor | Developer | |
| Through Games | DeveloperPublisher | |
| ThroughLine Games | Developer | |
| ThroughTunnel | Developer | |
| Throw the Warped Code Out | DeveloperPublisher | |
| Throwback Entertainment | Publisher | |
| Throwback Games | Developer | |
| ThrowbackDev | Developer | |
| Thruster Games | Developer | |
| ThubyDev | Developer | |
| Thuleanx | Developer | |
| Thund | Developer | |
| Thunder Cloud Studio | Publisher | |
| Thunder Egg Concepts | Developer | |
| Thunder Lotus | Developer | |
| Thunder Lotus Games | DeveloperPublisher | |
| Thunder Mountain | DeveloperPublisher | |
| Thunder Mountain (company) | Publisher | |
| Thunder Perfect Witchcraft | Developer | |
| ThunderLime | Developer | |
| Thunder_Loud | Developer | |
| Thunder_Wood | Developer | |
| Thundercloud | Developer | |
| Thunderduck | Developer | |
| Thunderent | Developer | |
| Thunderfall Publishing | Publisher | |
| Thunderful | Publisher | |
| Thunderful Games | Publisher | |
| Thunderful Publishing | Publisher | |
| Thunderous Echo | Developer | |
| Thunderous Wizard Studios | Developer | |
| Thundersparks | Developer | |
| Thunderstruck Games | Developer | |
| Thur | Developer | |
| Thuranius | Developer | |
| ThyDuck | Developer | |