BSK is a three-letter abbreviation that may refer to:
- Binary shift keying, see: digital modulation
- The British School of Kuwait
- Bosco Seva Kendra, India
- Basingstoke railway station
- BSK, a UK designation for Brake Standard Corridor railway coaches
- BSk, a kind of Semi-arid climate
- Bailey School Kids, book series
- Bokusatsu Shoujo Koubou (撲殺少女工房, Bokusatsu Shōjo Kōbō?), a chiptune musician from Fukuoka, Japan
- Bradshaw Kings
- the simulation dog game Black Star Kennels
- The Bash Street Kids, a comic strip in The Beano
- OFK Beograd, a Serbian football club which was known as BSK during the periods of 1911–1945 and 1950–1957.
- FK BSK Borča, a Serbian football club.
- Bleached softwood kraft paper