BSK is a three-letter abbreviation that may refer to:

• OFK Beograd, Serbian football club
• FK BSK Borča, Serbian football club
• FK BSK Batajnica, Serbian football club
• FK BSK Banja Luka, Bosnian-Herzegovinian football club
• FK BSK Ledinci, Bosnian-Herzegovinian football club
• BSK Saint Petersburg, a former Russian bandy club

• Banashankari, a neighborhood in Bangalore, India
• Basingstoke railway station, station code
• Brake Standard Corridor, a railway coach type in the U.K.
• The British School of Kuwait
• Brödraskapet, a Swedish prison gang
• BSK Defense, a Greek manufacturer of aerial target and aerial observation products
• BSk, cold semi-arid climate
• BSK Jr. books, in the Bailey School Kids series
• Burushaski (ISO 639:bsk), a language spoken by Burusho people in Pakistan and India
• Bone Street Krew, a professional wrestling group