GTR
GTR may refer to:

Transportation
Great River Railroad, in Mississippi, US
Grand Trunk Railway, a defunct North American railway
Golden Triangle Regional Airport (IATA and FAA LID codes), serving Columbus, Mississippi, US
Govia Thameslink Railway, a British railway operator
GTR Euroseries, a short-lived European auto racing series
Global Technical Regulations, a 1998 multinational agreement regarding vehicle regulations

Automobiles
Gran Turismo (racing), a type of sports car
BMW M3 GTR
Holden Torana GTR
Isuzu Bellett GT-R
Mazda Familia GT-R
McLaren F1 GTR
McLaren P1 GTR
Mercedes-AMG GT R
Mercedes-Benz CLK GTR
Nissan Skyline GT-R
Nissan GT-R
Porsche 924 Carrera GTR
Toyota Celica 2000 GTR
Ultima GTR
Ford Mustang GT-R concept car

Science and medicine
Generalised time reversible, in biology
Guided tissue regeneration, in dentistry

Video games
GTR – FIA GT Racing Game, a video game
GTR Evolution, a video game
GTR Group, owner of the defunct video game company Mad Catz

Other uses
GTR (band), a British rock band
GTR (album), their sole official studio album
Gateway to Research (Gtr), UK research information portal
GTR-18 Smokey Sam, an American SAM training rocket
Green tree reservoir, flooded forest land

See also
GT (disambiguation)