The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Tomb Raider (Series) (4 members)
- Tony Hawk's (Series) (6 members)
- Top-down shooter (Genre) (5 members)
- TopWare Interactive (Publisher) (3 members)
- Top Spin (Series) (2 members)
- Topware Interactive (Publisher) (1 member)
- Torn Banner Studios (Developer) (1 member)
- Torn Banner Studios (Publisher) (1 member)
- Torus Games (Developer) (4 members)
- Torus Games (Publisher) (1 member)
- Tose (Developer) (1 member)
- Tower defense (Genre) (15 members)
- Toxic Games (Developer) (1 member)
- Toxic Games (Publisher) (1 member)
- Toy Story (Series) (1 member)
- Toybox Inc. (Developer) (1 member)
- Toys for Bob (Developer) (4 members)
- Tozai Games (Publisher) (3 members)
- Tragnarion Studios (Developer) (1 member)
- Trails (Series) (1 member)
- Train Simulator (Genre) (2 members)
- Train Simulator (Series) (2 members)
- Transformers (Series) (7 members)
- Transmission Games (Developer) (2 members)
- Trapdoor (Developer) (1 member)
- Trapdoor (Publisher) (1 member)
- Traveller's Tales (Developer) (16 members)
- Treasure Co. (Developer) (1 member)
- Trendy Entertainment (Developer) (1 member)
- Treyarch (Developer) (8 members)
- Tri-Ace (Developer) (4 members)
- Tri-Crescendo (Developer) (2 members)
- Trickstar Games (Developer) (3 members)
- Trine (Series) (2 members)
- Trine Games (Developer) (3 members)
- Trion Worlds (Developer) (1 member)
- Trion Worlds (Publisher) (1 member)
- Triumph Studios (Developer) (1 member)
- Trivia (Genre) (26 members)
- Tru Blu Entertainment (Publisher) (9 members)
- Turn-based (Genre) (1 member)
- Turn-based tactics (Genre) (4 members)
- Two Tribes (Developer) (1 member)
- UFC Undisputed (Series) (3 members)
- UFO Interactive Games (Publisher) (3 members)
- UIG Entertainment (Publisher) (1 member)
- UNKNOWN GAMES (Developer) (2 members)
- Ubisoft (Developer) (10 members)
- Ubisoft (Publisher) (101 members)
- Ubisoft Blue Byte (Developer) (1 member)