Bolesław Szabelski (3 December 1896 in – 27 August 1979 in Katowice) was a Polish composer of modern classical music. While his style shifted and varied over the course of his life, he is best known for his atonal work composed during the 1950s and 1960s. Szabelski studied at Polish Musical Society School with Łysakowski in 1915. He attended the Warsaw Conservatory under Karol Szymanowski. Between 1929 and 1939, he taught organ and composition at the conservatoire of Katowice.