GRT may refer to:
- Gender reassignment therapy
General Recorded Tape, former US tape producer
- GRT Records, Canadian label of General Recorded Tape
- GRT Records (U.S. Label), of General Recorded Tape
- Gross register tonnage, cargo capacity of a ship
- Grand River Transit authority, Region of Waterloo, Ontario, Canada
- Guangdong Radio and Television, a major Chinese radio and television network.