| Acronym | Definition |
|---|
| GCTT➣Graduate Certificate in Tertiary Teaching (various universities) |
| GCTT➣Ground Combat Tactical Trainer (US Army) |
| GCTT➣Groupe Chabaane Taleb Trading (French: Chabaane Taleb Trading Group; Tunisia) |
| GCTT➣Germ Cell Testicular Tumor (oncology) |