BX, Bx, and similar may refer to:
Businesses and organizations Barnard's Express, a transportation company in British Columbia, Canada Base exchange, a store operated by the Army, Naval, and Air Force Exchange Service Berne eXchange, the stock exchange of Bern, Switzerland Blackstone Group (NYSE stock ticker symbol BX) BookCrossing, a program for sharing second-hand books Air Busan (established 2007) (IATA airline code BX) Coast Air (1998–2008) (IATA airline code BX) Brand Experience, which encompasses all the interactions and feelings a customer has with a brand, from initial awareness to post-purchase engagement
Vehicles BX (sternwheeler), a boat owned by Barnard's Express Citroën BX, an automobile Bionix AFV, an infantry fighting vehicle produced in Singapore
Science and technology Biology and medicine Biopsy, the extraction of cells or tissues to determine the presence or extent of a disease Bithorax (part of bithorax complex), a genetic mutation in flies
Computing BX register, a general-purpose 16-bit X86 register BitchX, an IRC client Intel 440BX, chipset for Pentium II/Pentium III/III and Celeron processors Bidirectional transformations
Other uses in science and technology BX cable, a genericized trademark term for a type of AC armoured electrical cable BeppoSAX catalog, also called SAX and 1SAX Brix (°Bx), measurement unit of the dissolved sugar-to-water mass ratio of a liquid
Places Belgium, World Meteorological Organization country code Brussels (French: Bruxelles), the capital of the nation BeNeLux, a politico-economic union of Belgium, the Netherlands, and Luxembourg Berryessa, San Jose, California Bordeaux, France The Bronx, one of the five boroughs of The City of New York, New York, U.S. (also for many institutions, usually in the borough, and named for it) Brunei (LOC MARC code and obsolete FIPS Pub 10-4 and NATO country codes)
Other uses BX convoys of World War II ships Battlecross, a rock band from Michigan