BTA may refer to:
- Butyric acid
 - Baltimore Transit Alliance
 - Basic Trading Area, a geographical area defined by the U.S. Federal Communications Commission
 - Becoming the Archetype, a Christian metal band
 - Benzotriazole
 - Bicycle Transportation Alliance
 - Bilateral trade agreement
 - Bilateral Terran Alliance, a fictional human alliance in the 1985 film Enemy Mine
 - Biological Terrain Assessment
 - Black Theatre Alliance, a federation of theater companies in New York City
 - BlueTooth Address
 - Bolshoi Teleskop Azimutalnyi, a 6 m telescope located in Russia
 - Botswana Telecommunications Authority
 - British Tourist Authority
 - British Triathlon Association, the former name of the British Triathlon Federation
 - BTA Bank, of Kazakhstan, formerly Bank TuranAlem
 - Bulgarian News Agency
 - Business Technology Association
 - Business Transformation Agency
 - Board of Tax Appeals
 - Blair Municipal Airport, Blair, Nebraska (FAA LID code)
 - Bertoua Airport, Bertoua, Cameroon (IATA code)
 
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