Richard William Leopold (6 January 1912 in New York City – 23 November 2006 in Evanston, Illinois) was a prominent diplomatic and military historian at Northwestern University.
The book based on his dissertation, Robert Dale Owen (Harvard University Press, 1940), a study of the Indiana congressman and utopian socialist, won the John H. Dunning Prize of the American Historical Association.
In 1963, he was appointed William Smith Mason Professor of History at Northwestern and served in that position until he retired 31 August 1980.
), Rep. James Kolbe (R-Ariz.), former assistant secretary of state Phyllis E. Oakley, historian John Morton Blum, journalist Georgie Anne Geyer, and television and motion picture director Garry Marshall.
He was a member of the Editorial Advisory Committee for the Papers of Woodrow Wilson and of the board of directors for the Harry S. Truman Library Institute.