| Acronym | Definition |
|---|
| GTT | Glucose Tolerance Test |
| GTT | Gruppo Torinese Trasporti |
| GTT | Gone To Texas |
| GTT | Global Telecom & Technology (various locations) |
| GTT | Global Tracking Trigger |
| GTT | Generic Translation Table |
| GTT | Gt Turbo |
| GTT | Global Title Translations |
| GTT | Global Title Translation |
| GTT | Gateway to Technology (educational program) |
| GTT | Guttae (Latin: Drops) |
| GTT | Geiger Tube Telescope |
| GTT | Google Translation Toolkit (software) |
| GTT | Guaranteed Turn Times (Oasis) |
| GTT | Graphics Translation Table |
| GTT | Gavin's Tips and Tricks (video episodes) |
| GTT | Grand Trunk Trailblazers (Massachusetts) |
| GTT | Gemeenschappelijke Trefwoorden-Thesaurus |
| GTT | GlobalTouch Telecom, Inc. |
| GTT | Global Text and Total Conversation Services |
| GTT | Government Technical Test |