| Abbreviation | Definition |
|---|---|
| GSTL | Genco Shipping Trading Ltd |
| GSV | General Systems Vehicles |
| GSW | Golden Sun World |
| GSWC | G Scott Waddell Company |
| GSWC | Golden State Water Company |
| GT | GuangTai |
| GT&T | Guyana Telephone and Telegraph Company |
| GTA | Global Textile Alliance |
| GTA | Go 2 Talent Agency |
| GTA | GTA TeleGuam (formerly Guam Telephone Authority) |
| GTBC | Grand Teton Brewing Company |
| GTBL | Gujarat Themis Biosyn Ltd |
| GTC | General Technologies Corp |
| GTC | General Telephone Company |
| GTC | General Transport Company |
| GTC | Georgia Theatre Company |
| GTC | Georgia Transmission Corporation |
| GTC | German Tank Corp |
| GTC | Global Telesat Corp |
| GTC | Global Tobacco Company |