Marion Hartzog Smoak (July 8, 1916 – May 4, 2020) was an American politician and lawyer. He was a Republican. He was Chief of Protocol of the United States under President Richard Nixon from 1972 to 1974. He was a member of the presidential campaign staff and transition team for Ronald Reagan in 1980. He also served as member of the South Carolina Senate from 1967 to 1968.