List of premiers of Ontario by time in office

This is a list of Premiers of Ontario in order of time served in office as Premier of Ontario as of February 8, 2021. The preceding Premier always stays in office during an election campaign, and that time is included in the total. See also List of Ontario political parties by time in office.

  Progressive Conservative Party of Ontario (14)
  Ontario Liberal Party (10)
  New Democratic Party of Ontario (1)
  United Farmers of Ontario (1)


RankPremierIncumbencyDates in PowerMandates
  1Oliver Mowat23 years, 270 days[1]1872–18966
  2Bill Davis13 years, 344 days[2]1971–19854
  3Leslie Frost12 years, 188 days[3]1949–19613
  4James Whitney9 years, 229 days[4]1905–1914[5]4
  5John Robarts9 years, 113 days[6]1961–19712
  6Dalton McGuinty9 years, 111 days[7]2003–20133
  7Mitchell Hepburn8 years, 103 days[8]1934–19422
  8Howard Ferguson7 years, 152 days[9]1923–19303
  9Mike Harris6 years, 292 days[10]1995–20022
  10Kathleen Wynne5 years, 138 days[11]2013–20181
  11George William Ross5 years, 110 days[12]1899–19051
  12David Peterson5 years, 97 days[13]1985–19901*
  13George A. Drew5 years, 63 days[14]1943–19483
  14William Howard Hearst5 years, 43 days[15]1914–19190
  15Bob Rae4 years, 268 days[16]1990–19951
  16John Sandfield Macdonald4 years, 157 days[17]1867–18711
  17Ernest Charles Drury3 years, 244 days[18]1919–19231
  18George Stewart Henry3 years, 207 days[19]1930–19340
  19Arthur Sturgis Hardy3 years, 92 days[20]1896–18991
  20Doug Ford (incumbent)2 years, 224 days2018–present1
  21Ernie Eves1 year, 190 days[21]2002–20030
  22Edward Blake310 days[22]1871–18721
  23Gordon Daniel Conant209 days[23]1942–19430
  24Thomas Laird Kennedy197 days[24]19480
  25Frank Miller138 days[25]19851*
  26Harry Nixon91 days[26]19430
^* Frank Miller's Progressive Conservative Party won a plurality of seats in the 1985 Ontario general election, but the resulting 33rd Parliament of Ontario passed a motion of no confidence against him less than two months into his mandate, replacing his government with David Peterson's Liberal Party. This table counts the 1985 election as a mandate for Miller.

References
  1. "Oliver Mowat, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  2. "William Grenville Davis, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  3. "Leslie Miscampbell Frost, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  4. "James Pliny Whitney, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  5. died in office
  6. "John Parmenter Robarts, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  7. "Dalton McGuinty, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  8. "Mitchell Frederick Hepburn, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  9. "George Howard Ferguson, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  10. "Michael Harris, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  11. "Kathleen O. Wynne, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  12. "George William Ross, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  13. "David Robert Peterson, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  14. "George Alexander Drew, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  15. "William Howard Hearst, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  16. "Bob Keith Rae, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  17. "John Sandfield Macdonald, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  18. "Ernest Charles Drury, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  19. "George Stewart Henry, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  20. "Arthur Sturgis Hardy, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  21. "Ernie Eves, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  22. "Edward Blake, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  23. "Gordon Daniel Conant, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  24. "Thomas Laird Kennedy, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  25. "Frank Stuart Miller, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
  26. "Harry Corwin Nixon, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
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