Alexander Konstantinovich Glazunov (, 10 August 1865 – 21 March 1936) was a Russian composer, music teacher, and conductor of the late Russian Romantic period. He served as director of the Saint Petersburg Conservatory between 1905 and 1928 and was also instrumental in the reorganization of the institute into the Petrograd Conservatory, then the Leningrad Conservatory, following the Bolshevik Revolution. He continued heading the Conservatory until 1930, though he had left the Soviet Union in 1928 and did not return. The best known student under his tenure during the early Soviet years was Dmitri Shostakovich.