BS4 or BS-4 may refer to :
* BS4, a BS postcode area for Bristol, England
* BS-4, ''Biuro Szyfrów 4'', the German section of the Polish Cipher Bureau
* BS4, a Drill bit sizes#Center drill bit sizes, center drill bit size
* B-s4, a variant of the Antonov A-1 aircraft
* ''BS 4 Specification for Structural Steel Sections'', a List of British Standards, British Standard
* Bonomi BS.4 Basettino, an Italian primary glider in the 1930s
* Brilliance BS4, a 2007 Chinese car
* BS-IV Bharat Stage emission standards in India
* BS4, a brass left-hand threaded Gas cylinder valve
* Beautiful Soup (HTML parser), Beautiful Soup, imported as bs4, an HTML and XML parser written in the Python programming language
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