BT may stand for:
- Bacillus thuringiensis, see Bt
- Bhutan (ISO country code)
- Bodensee-Toggenburg-Bahn, the Swiss railway company
- Brian Transeau, the Dance music artist BT
- British Telecom
- Bt toxin
- B.T, the Danish tabloid newspaper
- BT-2, BT-5, BT-7, the Soviet fast tanks
- BT (Binary Terrain), a GIS DEM file format