General Theory of Relativity, same as general relativity, abbreviated GR.

Nissan Skyline GT-R

Substitution model - The generalised time reversible substitution model

Grand Trunk Railway

Porsche 924 Carrera GTR - a racing version of the 924 Carrera GT

Mercedes-Benz CLK GTR

Nissan GT-R

GTR Euroseries, a short-lived European auto racing series.

GTR (band) founded by guitarists Steve Hackett and Steve Howe

GTR, a three letter acronym, can refer to:

GTR - FIA GT Racing Game 2, a sequel to GTR.

GTR - FIA GT Racing Game, which is developed by Simbin.

Ultima GTR

Gran Turismo Racer, Gran Tourer Racing or similar, commonly associated with performance cars. Vehicles that uses the designation are:

Golden Triangle Regional Airport, Lowndes County, Mississippi

McLaren F1 GTR - The competition evolution of the McLaren F1 roadcar.

In D.I.C.E., this is an acknowledgement response used by D.I.C.E. members, which is similar to FAB in Thunderbirds (TV series).

Global Technical Regulation(s) - A new set of vehicle legislative requirements that are being created by the UN ECE World Forum for Harmonization of Vehicle Regulations.