| Abbreviation | Definition |
|---|---|
| GTAT | General Tourism Aptitude Test |
| GTB | Grenada Tourist Board |
| GTBF | Group Travel Business Forum |
| GTGS | Graduate Travel Grant Service |
| GTI | Grand Tourism Injection |
| GTI | Grand Tourist Injection |
| GTM | Germany Travel Mart |
| GTM | Global Travel Marketplace |
| GTME | Global Travel and Middle East |
| GTME | Global Travel Middle East |
| GTN | Gifted Travel Network |
| GTP | Global Travel Professional |
| GTP | Greek Travel Pages |
| GTRS | General Travel and Representation Services |
| GTSE | Global Tourism Sharing Ecology |
| GTTP | Global Travel and Tourism Partnership |
| GTTP | Global Travel Tourism Partnership |
| GTV | Global Travel Vaccinations |
| GTV | Grosperrin Tourisme Voyage |
| GTWA | Golf Travel Writers of America |