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 center drill bit size B-s4, a variant of the Antonov A-1 aircraft BS 4 Specification for Structural Steel Sections, a 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, imported as bs4, an HTML and XML parser written in the Python programming language