BT may stand for:

• abbreviation for the title Baronet in the British honours system
• British Telecom , the privatised former state telecommunications body of the United Kingdom
• Brian Transeau, the electronic music artist BT
• The bacterium Bacillus thuringiensis, see Bt
• Bhutan (ISO 3166-1 alpha-2 country code)
• BitTorrent - on Internet content distribution system
• Bodensee-Toggenburg-Bahn, the Swiss railway company
• Bt toxin, (a.k.a. Cry proteins) a family of insecticidal toxins produced by the bacterium Bacillus thuringiensis
• B.T. (tabloid) , the Danish tabloid newspaper
• BT-2, BT-5, BT-7, the Soviet fast tanks
• Binary Terrain , a GIS DEM file format
• The BT - the Burton Taylor Theatre
• Bluetooth - a wireless personal area network standard
• the IATA code for Air Baltic