Robert or Bob Dietz may refer to:
Robert H. Dietz (1921–1945), American Medal of Honor recipient
Robert S. Dietz (1914–1995), American geophysicist and oceanographer
Robert Edwin Dietz (1818–1897), American businessman Bob Dietz (1917–1999), American professional basketball player See also Robert Deitz (born 1946), American lawyer and intelligence officer Robert Dietz Farmhouse, listed on the National Register of Historic Places in Albuquerque, New Mexico Robert Dietz Memorial Stadium, in Kingston, New York