Frank Hawkins Underhill (November 26 1885 – September 16 1971) was a Canadian historian, social critic and political thinker. He was educated University of Toronto and Oxford University where he was a member of the Fabian Society. He taught history at the University of Saskatchewan from 1914 until 1927 with a long interruption during World War I when he served as an officer. He also taught from 1927 until 1955 at the University of Toronto. He left the University of Toronto due to a dispute with the administration and later joined the faculty at Carleton University.