| Abbreviation | Definition |
|---|---|
| GSM-R | Global System for Mobile Communications - Railway |
| GSP | Garden State Parkway |
| GSRTC | Gujarat State Road Transport Corporation |
| GST | Grab Shoppers Trolley |
| GST | Grand Sports Tourer |
| GSTR | Grand Southern Trunk Road |
| GT | Garbage Truck |
| GT | Gas Truck |
| GT | Got Turbo |
| GT | Gran Tourismo |
| GT | Great Touring |
| GTA | Grand Trans Am |
| GTAA | Greater Toronto Airports Authority (Ontario, Canada) |
| GTAG | Greenbelt Transportation Advisory Group |
| GTB | Grand Tourismo Berlinetta |
| GTBA | Gasoline-Grade Tertiary Butyl Alcohol |
| GTC | Genesee Transportation Council |
| GTC | Good Tyre Condition |
| GTD | Grand Touring Diesel |
| GTE | Grand Touring Europe |