GRT

GRT may refer to:

• Grease Removal Technology, or GRT- Lipase enzyme
• General Recorded Tape, aka GRT Corporation, a defunct corporation that owned Chess Records and Janus Records as well as being a label in its own right
• General relativity theory
• Gross receipts tax, a tax levied on the gross revenue of a company
• Gross Register Tonnage, a measure of the cargo capacity of a ship
• GRT Corporation, an American IT services provider headquartered in Stamford, CT
• Grand River Transit, a regional transit authority in the Region of Waterloo, Ontario, Canada
• Granular Recovery Technology