| Acronym | Definition |
|---|
| GTN | Glyceryl Trinitrate |
| GTN | Greater Talent Network (speakers bureau; New York, NY) |
| GTN | Global Technology Network |
| GTN | Germantown (Maryland) |
| GTN | Global Transportation Network |
| GTN | Gestational Trophoblastic Neoplasia |
| GTN | Genetic Testing Network (National Health Service; UK) |
| GTN | Global Training Network (WHO) |
| GTN | Gross To Net |
| GTN | Global Telescope Network (Sonoma State University) |
| GTN | Government Telecommunications Network |
| GTN | Global Trend Network |
| GTN | Global Telecommunications Network (air traffic management) |
| GTN | Galactic Trade Navy (game) |
| GTN | Go Together Number (Bell Canada Reference) |
| GTN | Geotrail Norge (Norwegian) |
| GTN | Global Transaction Network (AT&T) |
| GTN | General Television Network (Oak Park, Michigan) |