Maria Dietz (7 February 1894 – 12 April 1980) was a German politician of the Christian Democratic Union (CDU) and former member of the German Bundestag.
Dietz was a member of the German Bundestag for two terms from 7 September 1949 to 6 October 1957. She was elected via the state list of the CDU in Rhineland-Palatinate.