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 January 30, 2016. 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.

Rank	Premier	Incumbency	Dates in Power	Mandates
1	Mowat, OliverOliver Mowat	23 years, 270 days[1]	1872-1896	6
2	Davis, BillBill Davis	13 years, 344 days[2]	1971-1985	4
3	Frost, LeslieLeslie Frost	12 years, 188 days[3]	1949-1961	3
4	Whitney, JamesJames Whitney	9 years, 229 days[4]	1905-1914[5]	4
5	Robarts, JohnJohn Robarts	9 years, 113 days[6]	1961-1971	2
6	McGuinty, DaltonDalton McGuinty	9 years, 111 days[7]	2003-2013	3
7	Hepburn, MitchellMitchell Hepburn	8 years, 103 days[8]	1934-1942	2
8	Ferguson, HowardHoward Ferguson	7 years, 152 days[9]	1923-1930	3
9	Harris, MikeMike Harris	6 years, 292 days[10]	1995-2002	2
10	Ross, George WilliamGeorge William Ross	5 years, 110 days[11]	1899-1905	1
11	Peterson, DavidDavid Peterson	5 years, 97 days[12]	1985-1990	1^*
12	Drew, George A.George A. Drew	5 years, 63 days[13]	1943-1948	3
13	Hearst, William HowardWilliam Howard Hearst	5 years, 43 days[14]	1914-1919	0
14	Rae, BobBob Rae	4 years, 268 days[15]	1990-1995	1
15	Macdonald, John SandfieldJohn Sandfield Macdonald	4 years, 157 days[16]	1867-1871	1
16	Drury, Ernest CharlesErnest Charles Drury	3 years, 244 days[17]	1919-1923	1
17	Henry, George StewartGeorge Stewart Henry	3 years, 207 days[18]	1930-1934	0
18	Hardy, Arthur SturgisArthur Sturgis Hardy	3 years, 92 days[19]	1896-1899	1
19	Wynne, KathleenKathleen Wynne (incumbent)	2 years, 353 days[20]	2013–present	1
20	Eves, ErnieErnie Eves	1 year, 190 days[21]	2002-2003	0
21	Blake, EdwardEdward Blake	310 days[22]	1871-1872	1
22	Conant, Gordon DanielGordon Daniel Conant	209 days[23]	1942-1943	0
23	Kennedy, Thomas LairdThomas Laird Kennedy	197 days[24]	1948-1949	0
24	Miller, FrankFrank Miller	138 days[25]	1985	1^*
25	Nixon, HarryHarry Nixon	91 days[26]	1943	0

^* Frank Miller's Progressive Conservative Party won a plurality of seats in the Ontario general election, 1985, 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. "George William Ross, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
12. "David Robert Peterson, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
13. "George Alexander Drew, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
14. "William Howard Hearst, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
15. "Bob Keith Rae, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
16. "John Sandfield Macdonald, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
17. "Ernest Charles Drury, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
18. "George Stewart Henry, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
19. "Arthur Sturgis Hardy, MPP". Legislative Assembly website. Legislative Assembly on Ontario. Retrieved April 1, 2013.
20. "Kathleen O. Wynne, 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.