| BT may stand for:
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* Baal teshuva, a Jew who became Orthodox (female version: ''Ba'alat teshuvah)
* Babylonian Talmud, a central text in Judaism
* Bacillus thuringiensis'', a bacterium which forms Bt toxins
* Baronet, a title in the British honours system abbreviated Bt
* Bathythermograph, a device used to obtain a record of temperature against depth in the ocean
* Body thetan, part of Scientology doctrine
* Brevet (military), a military term sometimes abbreviated Bt (although more often Bvt)
* BT (musician) (born 1971), stage name of electronica musician Brian Wayne Transeau
* BT tank, any of a series of Soviet military tanks |