| Acronym | Definition |
|---|
| GRT | Great |
| GRT | Good Rockin' Tonight |
| GRT | Gross Register Tonnage (cargo measurement; shipping) |
| GRT | Glimcher Realty Trust |
| GRT | Gene Replacement Therapy |
| GRT | Goruck Tough (team activity) |
| GRT | Grand River Transit (Waterloo, Canada) |
| GRT | Group Randomized Trial (clinical trial) |
| GRT | General Relativity Theory |
| GRT | Gross Receipt Tax |
| GRT | Gypsy, Roma and Traveller |
| GRT | Global Relief Technologies (Portsmouth, NH) |
| GRT | Group Rapid Transit |
| GRT | Grand Rapids Technologies (avionic instrument company) |
| GRT | Gruppo per le Relazioni Transculturali |
| GRT | Gestionnaires de Réseau de Transport (French) |
| GRT | Ground Resonance Testing |
| GRT | Germanium Resistance Thermometer |
| GRT | Generic Real Time |
| GRT | Granular Restore Technology (Symantec Inc.) |
| GRT | Government Rate Tender |
| GRT | Ground Receive Terminal |
| GRT | Gravity Race Tour (cycling) |
| GRT | Gold Rush Trail |
| GRT | Ground Readiness Test |
| GRT | Gross Registered Tonnage/Tons |
| GRT | Ground Radio Transmitter |
| GRT | General Range Types (forestry) |
| GRT | General Radiologic Technologist |
| GRT | General Reactor Technology |
| GRT | Governor Response Tester |
| GRT | Gross Requirement Tape |