The St. Petersburg Union of Composers, (Soyuz Kompositorov- Russian: Союз композиторов) is a professional and creative musical association with its headquarters at the former mansion of the Princess Vera F. Gagarina at 45 Bolshaya Morskaya Street, St Petersburg, Russia. It is a Department of the Union of Composers of the Russian Federation, formerly the Union of Soviet Composers.
The St. Petersburg Union of Composers was founded in 1932.
Amongst its members in its first decade of existence were established composers including B.V. Asafyev, V.M. Bogdanov-Berezovsky, A.P. Gladkovsky, V.M. Deshevovov, A.F. Pashchenko, Oles' Semyenovich Chishko, Y.A. Shaporin, D.D. Shostakovich, and young musicians B.A. Arapov, B.G. Holz, I.I. Dzerzhinsky, Y.V. Kochurov, V.V. Pushkov, G.N. Popov, V.P. Solovyev-Sedoy, M.I. Chulaki.
Chairmen of the Union have been: the musicologist B.A. Fingert, as first chairman; V.V. Shcherbachev (1935–37, 1944–48), I.O. Dunaevsky (1937–43), D.D. Shostakovich (1946–47), Chulaki (1947–48), Solovyev-Sedoy (1948–64), A.P. Petrov (1964-2006) and Grigory Korchmar (from 2006).
From 1964 for almost 30 years Andrei Petrov (died 2006) was the head of the St. Petersburg Union of Composers.
The Leningrad Department of the Union of Composers continued its work during the siege of 1941-44.
In the 1960-80s, S.P. Banevich, G.I. Banshchikov, Veniamin Yefimovich Basner, V.A. Gavrilin, L.A. Desyatnikov, A.A. Kneifel, A.N. Kolker, S.M. Slonimsky, B.I. Tishchenko, V.A. Uspensky, G.I. Ustvolskaya, Y.A. Falik, I.I. Schwarz and A.B.Zatin became members of the Leningrad Department of the Union of Composers. These composers and musicians played an outstanding role in the musical life of the city in the last third of the 20th century.