| Abbreviation | Definition |
|---|---|
| GTFS | General Transit Feed Specification |
| GTGT | Grand Trunk Grain Train |
| GTH | Global Transportation Hub |
| GTIB | Georgia Transportation Infrastructure Bank |
| GTIP | Guam Transportation Improvement Plan |
| GTMA | Geospatial Transportation Mapping Association |
| GTMS | Global Transportation Management Solutions |
| GTMS | Ground Transportation Management System |
| GTO | Gas Tires And Oil |
| GTO | Gran Turismo Omoligato |
| GTO | Grand Turismo Omologato |
| GTOF | Glasgow Taxi Outing Fund |
| GTP | Gran Touring Performance |
| GTP | Grand Touring Prototype |
| GTR | Government Transportation Request |
| GTR | Grain Transportation Report |
| GTR | Grand Trunk Railroad |
| GTS | Global Tracking System |
| GTS | Gran Tourismo Supremo |
| GTS | Grand Touring Sedan |