| Acronym | Definition |
|---|
| BT | British Telecommunications |
| BT | Break |
| BT | BlueTooth (wireless personal area networking technology) |
| BT | Northern Ireland (postcode, United Kingdom) |
| BT | BitTorrent (file swarming program) |
| BT | Balance Transfer |
| BT | Breakfast Television (Atlantic Canada Newsmagazine) |
| BT | Business Transformation |
| BT | Bhutan |
| BT | Business Times |
| BT | Broader Term (lexicography) |
| BT | Baghdad Time (GMT+0200) |
| BT | Battle Tested (paintball) |
| BT | Basic Training |
| BT | Bacillus Thuringiensis |
| BT | Billy Talent (band) |
| BT | Battletech (roleplaying game) |
| BT | Boys Toys |
| BT | Boat Tail |
| BT | Bundestag (German Parliament) |
| BT | Boston Terrier (canine breed) |
| BT | Building Technology (various organizations) |
| BT | Botosani (Romania county) |
| BT | Break Through |
| BT | Behavior Therapy |
| BT | Blood Test |
| BT | Board of Trade |
| BT | Berlingske Tidende (Denmark newspaper) |
| BT | Ballistic Tip |
| BT | Bad Taste (movie) |
| BT | Baronet |
| BT | Booker T (pro wrestler) |
| BT | Blues Traveler (band) |
| BT | Bankers Trust |
| BT | Bad Trip |
| BT | Blood Transfusion |
| BT | Bacterial Translocation |
| BT | Bassa Tensione (Italian: Low Voltage) |
| BT | Baja Tensión (Spanish: Low Voltage) |
| BT | Brown Thomas (Irish department store) |
| BT | Black Temple (World of Warcraft) |
| BT | Bow Thruster (boating) |
| BT | Break Time |
| BT | Baby Talk (magazine) |
| BT | Big Ticket |
| BT | Brian Transeau (DJ/producer/composer) |
| BT | Brain Teaser |
| BT | Back-Trajectory |
| BT | Brachytherapy |
| BT | Blood Type |
| BT | Block Type |
| BT | Business Telecommunications |
| BT | Brevet de Technicien (French) |
| BT | Bandwidth Time (Bluetooth) |
| BT | Biological Terrorism |
| BT | Byte This |
| BT | Bjørn Tore (Norwegian artist) |
| BT | Bit Test |
| BT | Bleeding Time (test of blood) |
| BT | Boys Town |
| BT | Overseas Trade (British archival material; Stanford University; Stanford, CA) |
| BT | Bolt Thrower (band) |
| BT | Black Tower (game) |
| BT | Banjo Tooie (video game) |
| BT | Burn-Through |
| BT | Block Transfer |
| BT | Basic Technology |
| BT | Black Tiger (shrimp) |
| BT | Begin Text |
| BT | Bonton |
| BT | Burn Time |
| BT | Bullet Time (game) |
| BT | Bismaleimide Triazine (resin used in chips and circuit boards) |
| BT | Burst Tolerance |
| BT | Bombay Times (India) |
| BT | Blast Theory (band) |
| BT | Binary Translation |
| BT | Bathythermograph |
| BT | Black Thorn (game) |
| BT | Bird Text (comedy group) |
| BT | Battletoads (video game) |
| BT | Budget Estimate |
| BT | Best-Of-Two |
| BT | Big Typhoon (CPU cooler) |
| BT | Beta Tau |
| BT | Borderline Tuberculoid (leprosy) |
| BT | Blalock-Taussig Shunt (also seen as B-T) |
| BT | Beginning of Tape |
| BT | Blue Tetrazolium (chemistry) |
| BT | Bench Trial |
| BT | Bruce Trail (Ontario) |
| BT | Black Templars (Space Marine Chapter, gaming) |
| BT | Bishops' Transcripts |
| BT | Boiler Technician (US Navy Rating) |
| BT | Bilgisayarli tomografi (Turkish: computerized tomography) |
| BT | butorphanol tartrate (nasal spray) |
| BT | Ball-Turret Gunner |
| BT | Billion Tonne |
| BT | Baggage Tag |
| BT | Brown Town |
| BT | Bamboo Tree |
| BT | Bomb Technician |
| BT | Bulb Thermometer |
| BT | Blair-Taylor (Wisconsin school district) |
| BT | Bloodthirster (gaming) |
| BT | Break Track |
| BT | Bering Time (GMT-1100) |
| BT | Black Tapestries (webcomic) |
| BT | Battalion Training |
| BT | Biomedical Times (resource) |
| BT | Bad Temperament (referring to pet personality) |
| BT | Break Transmission |
| BT | Before Tendulkar (India, sports) |
| BT | (USN Rating) Boiler Technician |
| BT | Beginning of Transmission |
| BT | Basis Traffic |
| BT | Botulism Toxoid |
| BT | Block Termination |
| BT | Baal T'Shuvah (Jewish religion) |
| BT | Bottle Toke |
| BT | Bloomington Public Transportation Corporation |
| BT | Banco de los Trabajadores (Guatemalan bank) |
| BT | Bathythermal |
| BT | Builders Trials |
| BT | Bottom of Tape |
| BT | Battalion Terminal |
| BT | Bashkia E Tiranës (Albanian: Tirana municipality) |
| BT | Behavioral Taxonomy |
| BT | Baron Technology (New Haven, Connecticut) |