| Ontario Liberal Party leadership election, 1943 | |
| Date | April 30, 1943 |
| Convention | Toronto |
| Campaign to replace |
Gordon Daniel Conant |
| Won by | Harry Nixon |
| Ballots | 1 |
| Candidates | 4 |
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Ontario Liberal leadership conventions 1919, 1922, 1930, 1943, 1945, 1950, 1954, 1958, 1964, 1967, 1973, 1976, 1982, 1992, 1996 |
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The Ontario Liberal Party held a leadership election in 1943 to choose a permanent replacement to Mitchell Hepburn who had been forced to resign at the end of 1942. Because the Ontario Liberal Party was is power, the winner of the race would also become premier of the province. Initially, Hepburn attempted to anoint Gordon Daniel Conant as his permanent successor but the caucus did not accept this and forced a full leadership convention which was won on the first ballot by Harry Nixon.