| Acronym | Definition |
|---|
| GCTB➣Giant Cell Tumor of Bone |
| GCTB➣Green Cane Trash Blanketing (sugar industry) |
| GCTB➣Gold Coast Tourism Bureau (Australia) |
| GCTB➣Groupement des Constructeurs en Terre Battue (French Clay Builders Group) |
| GCTB➣Grover Chasers Touring Bunch (motorcycle club; New Zealand) |
| GCTB➣Garbay Courtier en Travaux du Bâtiment (French broker) |
| GCTB➣Gibson Cognitive Test Battery (skills screening) |