Oskar Wacker (October 20, 1898 – August 26, 1972) was a German politician of the Christian Democratic Union (CDU) and former member of the German Bundestag.
In 1946, he was a member of the constituent state assembly in Württemberg-Baden and was subsequently a member of the state parliament until 1950. He was a member of the German Bundestag from its first election in 1949 to 1957. In parliament he represented the constituency of Tauberbischofsheim.