Harry Corwin Nixon (April 1, 1891 – October 22, 1961) was a Canadian politician and briefly the 13th premier of Ontario in 1943.

He served as a Cabinet minister in the government of Premier Ernest C. Drury as Provincial Secretary and Registrar.

During World War II, Hepburn clashed with William Lyon Mackenzie King, the Liberal Prime Minister of Canada, arguing that King was not sufficiently prosecuting the war effort, in particular by not introducing conscription (see Conscription Crisis of 1944).

Nixon resigned from the cabinet on October 22, 1942, in opposition to Hepburn's refusal to allow a leadership convention to elect a new leader.

Conant was forced to resign after only six months due to serious divisions in the party, and a leadership convention was called.