GCTB
| 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) |