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

• Brussels South Charleroi Airport
• Brussels sprout
• Brussels Sprout
• Brussels sprouts
• Brussels, WI
• Brussels, Wisconsin
• Brusson, Aosta Valley
• Brusy
• Brut
• Brutakhi
• Brutalism
• Brutalist architecture
• Brutal Juice
• Brutal Planet
• Brutal Truth
• BRUTE!
• Brute!
• Brute
• Brute fact
• Brute Force
• Brute force
• Brute-force
• Brute Force (1947 film)
• Brute Force (1947 movie)
• Brute-force approach