• Gigatonne, a metric measure of mass

GT

Video games

• GT Interactive, an American video game developer
• GameTrailers, a video game website
• Golden Tee Golf, golf video game
• Gran Turismo (series), a series of racing video games
• Gran Turismo (video game)
• Gran Turismo 2
• Gran Turismo 3: A-Spec
• Gran Turismo 4
• Gran Turismo 5 Prologue
• Gran Turismo 5

Cars

• Gran Turismo (automobile)
• Grand tourer or Gran Turismo, a car classification and an acronym used in many models and trim levels
• FIA GT Championship
• Ford GT, a supercar built by Ford
• Opel GT, a sports car built by Opel
• Grand Touring, used by the IMSA GT Championship
• Lightning GT, a British electric sports car

Places

• Georgia Institute of Technology, commonly known as "Georgia Tech"
• Georgetown, Guyana, the capital and largest city of Guyana
• St. Joseph's College, Gregory Terrace, a Catholic boys' school commonly referred to as "Terrace"

Companies

• Göteborgs-Tidningen, a Swedish newspaper
• Grant Thornton LLP, a public accounting firm
• Greenberg Traurig, an international law firm

Entertainment

• Gay Times, a UK culture magazine for gay males
• Dragon Ball GT, a Japanese anime
• Gran Turismo (album), a 1998 album by the Cardigans
• Gulliver's Travels, a story published in the 1700s
• Gyllene Tider, a Swedish pop group

Science, technology, engineering, measurement

• Gas turbine, a rotary engine that extracts energy from a flow of combustion gas
• Geometry and Topology, a mathematical journal
• General Technics, an informal organization with interests in hard science fiction, hard sciences, and engineering
• Giant Trevally, a species of fish from the Carangidae family
• Gigatransfer, a number of data transfers (or operations)
• Global Title, an address used for routing signaling messages on telecommunications networks
• Gross ton in the Avoirdupois or Imperial system of measurements
• Guatemala's ISO country code

Transportation

• GB Airways' IATA code
• Grand Trunk Road, a historic road constructed by Emperor Sher Shah Suri connecting Afghanistan, Pakistan and India
• Gross tonnage system for measuring ships, replacing gross register tonnage
• GT Bicycles, a large American manufacturer of road, mountain, and BMX bicycles
• National Highway No. 1 (India), also popularly called as Grand Trunk Road

Other

• Gifted education, also known as gifted and talented education
• Gin and tonic, a drink
• Globus Toolkit, a software framework for implementing computational grids
• Google Talk, Google's Instant Messenger
• Google Test, a measure of notability on Wikipedia