List of prime ministers of Canada and premiers of Ontario

This is a list and timeline of prime ministers of Canada and premiers of Ontario. Canada's prime minister serves as The Primary minister of the Crown, chair of the Cabinet, and head of government of Canada, while the British monarch serves as head of state under representation from the governor general. The premier of Ontario is the head of provincial government, first minister, and the chair of the Executive Council (provincial cabinet). Both positions are defined as the leader of the party or coalition of parties with the most seats in their respective legislature, with its confidence. The intergovernmental relationship between Canada's largest province and the confederation itself are central to the political, economic, and social state of the country at large, as Ontario is home to 38.5% of the national population, beating out second-place Quebec by 15.5 percentage points, and responsible for 38.2% of the national GDP, once again beating out Quebec by 18.4 percentage points. The country's capital, Ottawa, where the federal government convenes at Parliament Hill, is also located in Ontario.

The longest concurrently serving pair are the country's first prime minister John A. Macdonald and the province's third premier Oliver Mowat, former Kingston law partners who held their respective offices for 12 years, 7 months, and 20 days straight from October 17, 1878 to June 6, 1891. John A. Macdonald was also part of the inaugural pair, alongside John Sandfield Macdonald (no relation), who he helped manoeuvre into the position. They served together for 4 years, 5 months, and 5 days between July 16, 1867 and December 20, 1871. Ontario was officially without premier for the first fifteen days of Canadian Confederation. William Lyon Mackenzie King served with a record 7 different premiers (Drury, Ferguson, Hepburn, Conant, Nixon, Drew, and Kennedy), while Oliver Mowat also served with the first 7 prime ministers (Macdonald, Mackenzie, Abbott, Thompson, Bowell, Tupper, and Laurier). The current holders are Mark Carney and Doug Ford, since March 14, 2025.

Timeline of prime ministers of Canada and premiers of Ontario

Prime minister of Canada	Party	Premier of Ontario	Party	Start	End	Tenure
John A. Macdonald	Liberal-Conservative	Vacant		July 1, 1867	July 16, 1867	15 days
John A. Macdonald	Liberal-Conservative	John Sandfield Macdonald	Liberal-Conservative	July 16, 1867	December 20, 1871	1618 days
John A. Macdonald	Liberal-Conservative	Edward Blake	Liberal	December 20, 1871	October 25, 1872	310 days
John A. Macdonald	Liberal-Conservative	Oliver Mowat	Liberal	October 25, 1872	November 5, 1873	376 days
Vacant		Oliver Mowat	Liberal	November 5, 1873	November 7, 1873	2 days
Alexander Mackenzie	Liberal	Oliver Mowat	Liberal	November 7, 1873	October 8, 1878	1796 days
Vacant		Oliver Mowat	Liberal	October 8, 1878	October 17, 1878	9 days
John A. Macdonald	Conservative	Oliver Mowat	Liberal	October 17, 1878	June 6, 1891	4615 days
Vacant		Oliver Mowat	Liberal	June 6, 1891	June 16, 1891	10 days
John Abbott	Conservative	Oliver Mowat	Liberal	June 16, 1891	November 24, 1892	527 days
Vacant		Oliver Mowat	Liberal	November 24, 1892	December 5, 1892	11 days
John Sparrow David Thompson	Conservative	Oliver Mowat	Liberal	December 5, 1892	December 12, 1894	737 days
Vacant		Oliver Mowat	Liberal	December 12, 1894	December 21, 1894	9 days
Mackenzie Bowell	Conservative	Oliver Mowat	Liberal	December 21, 1894	April 27, 1896	493 days
Vacant		Oliver Mowat	Liberal	April 27, 1896	May 1, 1896	4 days
Charles Tupper	Conservative	Oliver Mowat	Liberal	May 1, 1896	July 8, 1896	68 days
Vacant		Oliver Mowat	Liberal	July 8, 1896	July 11, 1896	3 days
Wilfrid Laurier	Liberal	Oliver Mowat	Liberal	July 11, 1896	July 21, 1896	10 days
Wilfrid Laurier	Liberal	Arthur Sturgis Hardy	Liberal	July 21, 1896	October 21, 1899	1187 days
Wilfrid Laurier	Liberal	George William Ross	Liberal	October 21, 1899	February 8, 1905	1936 days
Wilfrid Laurier	Liberal	James Whitney	Conservative	February 8, 1905	October 6, 1911	2431 days
Vacant		James Whitney	Conservative	October 6, 1911	October 10, 1911	4 days
Robert Borden	Conservative	James Whitney	Conservative	October 10, 1911	September 25, 1914	1081 days
Robert Borden	Conservative	Vacant		September 25, 1914	October 2, 1914	7 days
Robert Borden	Conservative Unionist	William Hearst	Conservative	October 2, 1914	November 14, 1919	1869 days
Robert Borden	Unionist	Ernest C. Drury	United Farmers	November 14, 1919	July 10, 1920	239 days
Arthur Meighen	Unionist	Ernest C. Drury	United Farmers	July 10, 1920	December 29, 1921	537 days
William Lyon Mackenzie King	Liberal	Ernest C. Drury	United Farmers	December 29, 1921	July 16, 1923	564 days
William Lyon Mackenzie King	Liberal	Howard Ferguson	Conservative	July 16, 1923	June 28, 1926	1078 days (first tenure; 2490 days in total)
Vacant		Howard Ferguson	Conservative	June 28, 1926	June 29, 1926	1 day
Arthur Meighen	Conservative	Howard Ferguson	Conservative	June 29, 1926	September 25, 1926	88 days
William Lyon Mackenzie King	Liberal	Howard Ferguson	Conservative	September 25, 1926	August 7, 1930	1412 days (second tenure; 2490 days in total)
William Lyon Mackenzie King	Liberal	Howard Ferguson	Conservative	(July 16, 1923) (September 25, 1926)	(June 28, 1926) (August 7, 1930)	2490 days in total 1078 days 1412 days
R. B. Bennett	Conservative	Howard Ferguson	Conservative	August 7, 1930	December 15, 1930	130 days
R. B. Bennett	Conservative	George Stewart Henry	Conservative	December 15, 1930	July 10, 1934	1303 days
R. B. Bennett	Conservative	Mitchell Hepburn	Liberal	July 10, 1934	October 23, 1935	470 days
William Lyon Mackenzie King	Liberal	Mitchell Hepburn	Liberal	October 23, 1935	October 21, 1942	2555 days
William Lyon Mackenzie King	Liberal	Gordon Daniel Conant	Liberal	October 21, 1942	May 18, 1943	209 days
William Lyon Mackenzie King	Liberal	Harry Nixon	Liberal	May 18, 1943	August 17, 1943	91 days
William Lyon Mackenzie King	Liberal	George A. Drew	Progressive Conservative	August 17, 1943	October 19, 1948	1890 days
William Lyon Mackenzie King	Liberal	Thomas Laird Kennedy	Progressive Conservative	October 19, 1948	November 15, 1948	27 days
Louis St. Laurent	Liberal	Thomas Laird Kennedy	Progressive Conservative	November 15, 1948	May 4, 1949	170 days
Louis St. Laurent	Liberal	Leslie Frost	Progressive Conservative	May 4, 1949	June 21, 1957	2970 days
John Diefenbaker	Progressive Conservative	Leslie Frost	Progressive Conservative	June 21, 1957	November 8, 1961	1601 days
John Diefenbaker	Progressive Conservative	John Robarts	Progressive Conservative	November 8, 1961	April 22, 1963	530 days
Lester B. Pearson	Liberal	John Robarts	Progressive Conservative	April 22, 1963	April 20, 1968	1825 days
Pierre Trudeau	Liberal	John Robarts	Progressive Conservative	April 20, 1968	March 1, 1971	1045 days
Pierre Trudeau	Liberal	Bill Davis	Progressive Conservative	March 1, 1971	June 4, 1979	3017 days (first tenure; 4597 days in total)
Joe Clark	Progressive Conservative	Bill Davis	Progressive Conservative	June 4, 1979	March 3, 1980	273 days
Pierre Trudeau	Liberal	Bill Davis	Progressive Conservative	March 3, 1980	June 30, 1984	1580 days (second tenure; 4597 days in total)
Pierre Trudeau	Liberal	Bill Davis	Progressive Conservative	(March 1, 1971) (March 3, 1980)	(June 4, 1979) (June 30, 1984)	4597 days in total 3017 days 1580 days
John Turner	Liberal	Bill Davis	Progressive Conservative	June 30, 1984	September 17, 1984	79 days
Brian Mulroney	Progressive Conservative	Bill Davis	Progressive Conservative	September 17, 1984	February 8, 1985	144 days
Brian Mulroney	Progressive Conservative	Frank Miller	Progressive Conservative	February 8, 1985	June 26, 1985	138 days
Brian Mulroney	Progressive Conservative	David Peterson	Liberal	June 26, 1985	October 1, 1990	1923 days
Brian Mulroney	Progressive Conservative	Bob Rae	New Democratic	October 1, 1990	June 25, 1993	998 days
Kim Campbell	Progressive Conservative	Bob Rae	New Democratic	June 25, 1993	November 4, 1993	132 days
Jean Chrétien	Liberal	Bob Rae	New Democratic	November 4, 1993	June 26, 1995	599 days
Jean Chrétien	Liberal	Mike Harris	Progressive Conservative	June 26, 1995	April 14, 2002	2484 days
Jean Chrétien	Liberal	Vacant		April 14, 2002	April 15, 2002	1 day
Jean Chrétien	Liberal	Ernie Eves	Progressive Conservative	April 15, 2002	October 22, 2003	555 days
Jean Chrétien	Liberal	Vacant		October 22, 2003	October 23, 2003	1 day
Jean Chrétien	Liberal	Dalton McGuinty	Liberal	October 23, 2003	December 12, 2003	50 days
Paul Martin	Liberal	Dalton McGuinty	Liberal	December 12, 2003	February 6, 2006	787 days
Stephen Harper	Conservative	Dalton McGuinty	Liberal	February 6, 2006	February 11, 2013	2562 days
Stephen Harper	Conservative	Kathleen Wynne	Liberal	February 11, 2013	November 4, 2015	996 days
Justin Trudeau	Liberal	Kathleen Wynne	Liberal	November 4, 2015	June 29, 2018	968 days
Justin Trudeau	Liberal	Doug Ford	Progressive Conservative	June 29, 2018	March 14, 2025	2450 days
Mark Carney	Liberal	Doug Ford	Progressive Conservative	March 14, 2025	Present day	123 days (As of July 15, 2025)

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Lists of prime ministers of CanadaPolitics of Ontario

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Alexander Mackenzie (politician)Arthur MeighenArthur Sturgis HardyBill DavisBob RaeBrian MulroneyCabinet of CanadaCanadaCanadian ConfederationCharles TupperCoalition governmentConservative Party of CanadaConservative Party of Canada (1867–1942)Dalton McGuintyDavid PetersonDoug FordEdward BlakeErnest C. DruryErnie EvesExecutive Council of OntarioFrank Miller (Canadian politician)GDPGeorge A. DrewGeorge Stewart HenryGeorge William RossGordon Daniel ConantGovernor General of CanadaHarry NixonHead of governmentHead of stateHoward FergusonJames Whitney (politician)Jean ChrétienJoe ClarkJohn A. MacdonaldJohn AbbottJohn DiefenbakerJohn RobartsJohn Sandfield MacdonaldJohn Sparrow David ThompsonJohn TurnerJustin TrudeauKathleen WynneKim CampbellKingston, OntarioLegislatureLeslie FrostLester B. PearsonLiberal Party of CanadaList of current Canadian first ministersLouis St. LaurentMackenzie BowellMark CarneyMike HarrisMinister of the CrownMitchell HepburnMonarchy of the United KingdomOliver MowatOntarioOntario Liberal PartyOntario New Democratic PartyOttawaParliament HillParty leaderPaul MartinPierre TrudeauPremier of OntarioPrime Minister of CanadaProgressive Conservative Party of CanadaProgressive Conservative Party of OntarioQuebecR. B. BennettRobert BordenStephen HarperThomas Laird KennedyUnionist Party (Canada)United Farmers of OntarioWilfrid LaurierWilliam Hearst (politician)William Lyon Mackenzie King

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List of prime ministers of Canada and premiers of Ontario

Timeline of prime ministers of Canada and premiers of Ontario

See Also

List of OYP sessions

List of Canadian prime ministers and American presidents

Living Prime Ministers of New Zealand

List of heads of government of Croatia by longevity

List of children of the Prime Ministers of the United Kingdom