Horst Walter Stein (born 2 May 1928 in Elberfeld, Germany; died 27 July 2008 in Vandœuvres, Switzerland) was a German conductor. 　　Stein's father was a mechanic. At school in Frankfurt, he studied piano, oboe, and singing. Later, he continued studies at the university in Cologne, including lessons in composition with Busoni's disciple Philipp Jarnach. From 1947 to 1951, he was a repetiteur in Wuppertal.