List of premiers of Ontario by time in office

This is a list of Premier of Ontario in order of time served in office as Premier of Ontario as of February 23, 2012. 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 mandates
     1 Sir Oliver Mowat &1000000000000002300000023 years, &10000000000000270000000270 days 6
     2 Bill Davis &1000000000000001300000013 years, &10000000000000344000000344 days 4
     3 Leslie Frost &1000000000000001200000012 years, &10000000000000188000000188 days 3
     4 Sir James Whitney &100000000000000090000009 years, &10000000000000229000000229 days 4
     5 John Robarts &100000000000000090000009 years, &10000000000000113000000113 days 2
     6 Mitchell Hepburn &100000000000000080000008 years, &10000000000000103000000103 days 2
     7 Dalton McGuinty (incumbent) &100000000000000080000008 years, &10000000000000130000000130 days 3
     8 Howard Ferguson &100000000000000070000007 years, &10000000000000153000000153 days 3
     9 Mike Harris &100000000000000060000006 years, &10000000000000292000000292 days 2
     10 George William Ross &100000000000000050000005 years, &10000000000000111000000111 days 1
     11 David Peterson &100000000000000050000005 years, &1000000000000009700000097 days 2 [1]
     12 George Drew &100000000000000050000005 years, &1000000000000006300000063 days 3
     13 Sir William Hearst &100000000000000050000005 years, &1000000000000004300000043 days 0
     14 Bob Rae &100000000000000040000004 years, &10000000000000268000000268 days 1
     15 John Sandfield Macdonald &100000000000000040000004 years, &10000000000000158000000158 days 1
     16 Ernest Drury &100000000000000030000003 years, &10000000000000244000000244 days 1
     17 George Stewart Henry &100000000000000030000003 years, &10000000000000206000000206 days 0
     18 Arthur Hardy &100000000000000030000003 years, &1000000000000009100000091 days 1
     19 Ernie Eves &100000000000000010000001 year, &10000000000000190000000190 days 0
     20 Edward Blake 310 days 1
     21 Gordon Conant 209 days 0
     22 Thomas Kennedy 197 days 0
     23 Frank Miller 138 days 0 [2]
     24 Harry Nixon 91 days 0

The premier's office was vacant from September 26 to October 1, 1914 after James Whitney's death.

  1. ^ First term came with an accord with the NDP.
  2. ^ Won a minority government in 1985, but government was defeated by an accord between the Peterson Liberals and NDP.
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