Gustav Brecher (5 February 1879 – May 1940) was a German conductor, composer, and music critic. As director of the Leipzig Opera, he conducted world premieres of works by Ernst Krenek and Kurt Weill, including Jonny spielt auf and Rise and Fall of the City of Mahagonny. He was dismissed by the Nazis in 1933, lived at risk in Stalingrad, Berlin, Prague, and finally Ostend, where he took his life together with his wife's.