<P> This is a list of Premiers of Ontario in order of time served in office as Premier of Ontario as of June 18, 2018 . 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 . </P> <Table> <Tr> <Th> Rank </Th> <Th> Premier </Th> <Th> Incumbency </Th> <Th> Dates in Power </Th> <Th> Mandates </Th> </Tr> <Tr> <Td> 1 </Td> <Td> Mowat, Oliver Oliver Mowat </Td> <Td> 7003867000000000000 ♠ 23 years, 270 days </Td> <Td> 1872 - 1896 </Td> <Td> 6 </Td> </Tr> <Tr> <Td> 2 </Td> <Td> Davis, Bill Bill Davis </Td> <Td> 7003509300000000000 ♠ 13 years, 344 days </Td> <Td> 1971 - 1985 </Td> <Td> </Td> </Tr> <Tr> <Td> 3 </Td> <Td> Frost, Leslie Leslie Frost </Td> <Td> 7003457100000000000 ♠ 12 years, 188 days </Td> <Td> 1949 - 1961 </Td> <Td> </Td> </Tr> <Tr> <Td> 4 </Td> <Td> Whitney, James James Whitney </Td> <Td> 7003351600000000000 ♠ 9 years, 229 days </Td> <Td> 1905 - 1914 </Td> <Td> </Td> </Tr> <Tr> <Td> 5 </Td> <Td> Robarts, John John Robarts </Td> <Td> 7003340000000000000 ♠ 9 years, 113 days </Td> <Td> 1961 - 1971 </Td> <Td> </Td> </Tr> <Tr> <Td> 6 </Td> <Td> McGuinty, Dalton Dalton McGuinty </Td> <Td> 7003339900000000000 ♠ 9 years, 111 days </Td> <Td> 2003 - 2013 </Td> <Td> </Td> </Tr> <Tr> <Td> 7 </Td> <Td> Hepburn, Mitchell Mitchell Hepburn </Td> <Td> 7003302500000000000 ♠ 8 years, 103 days </Td> <Td> 1934 - 1942 </Td> <Td> </Td> </Tr> <Tr> <Td> 8 </Td> <Td> Ferguson, Howard Howard Ferguson </Td> <Td> 7003270900000000000 ♠ 7 years, 152 days </Td> <Td> 1923 - 1930 </Td> <Td> </Td> </Tr> <Tr> <Td> 9 </Td> <Td> Harris, Mike Mike Harris </Td> <Td> 7003248400000000000 ♠ 6 years, 292 days </Td> <Td> 1995 - 2002 </Td> <Td> </Td> </Tr> <Tr> <Td> 10 </Td> <Td> Wynne, Kathleen Kathleen Wynne (incumbent) </Td> <Td> 7003195300000000000 ♠ 5 years, 127 days </Td> <Td> 2013--present </Td> <Td> </Td> </Tr> <Tr> <Td> 11 </Td> <Td> Ross, George William George William Ross </Td> <Td> 7003193600000000000 ♠ 5 years, 110 days </Td> <Td> 1899 - 1905 </Td> <Td> </Td> </Tr> <Tr> <Td> 12 </Td> <Td> Peterson, David David Peterson </Td> <Td> 7003192300000000000 ♠ 5 years, 97 days </Td> <Td> 1985 - 1990 </Td> <Td> </Td> </Tr> <Tr> <Td> 13 </Td> <Td> Drew, George A. George A. Drew </Td> <Td> 7003189000000000000 ♠ 5 years, 63 days </Td> <Td> 1943 - 1948 </Td> <Td> </Td> </Tr> <Tr> <Td> 14 </Td> <Td> Hearst, William Howard William Howard Hearst </Td> <Td> 7003186900000000000 ♠ 5 years, 43 days </Td> <Td> 1914 - 1919 </Td> <Td> 0 </Td> </Tr> <Tr> <Td> 15 </Td> <Td> Rae, Bob Bob Rae </Td> <Td> 7003172900000000000 ♠ 4 years, 268 days </Td> <Td> 1990 - 1995 </Td> <Td> </Td> </Tr> <Tr> <Td> 16 </Td> <Td> Macdonald, John Sandfield John Sandfield Macdonald </Td> <Td> 7003161800000000000 ♠ 4 years, 157 days </Td> <Td> 1867 - 1871 </Td> <Td> </Td> </Tr> <Tr> <Td> 17 </Td> <Td> Drury, Ernest Charles Ernest Charles Drury </Td> <Td> 7003134000000000000 ♠ 3 years, 244 days </Td> <Td> 1919 - 1923 </Td> <Td> </Td> </Tr> <Tr> <Td> 18 </Td> <Td> Henry, George Stewart George Stewart Henry </Td> <Td> 7003130300000000000 ♠ 3 years, 207 days </Td> <Td> 1930 - 1934 </Td> <Td> 0 </Td> </Tr> <Tr> <Td> 19 </Td> <Td> Hardy, Arthur Sturgis Arthur Sturgis Hardy </Td> <Td> 7003118700000000000 ♠ 3 years, 92 days </Td> <Td> 1896 - 1899 </Td> <Td> </Td> </Tr> <Tr> <Td> 20 </Td> <Td> Eves, Ernie Ernie Eves </Td> <Td> 7002555000000000000 ♠ 1 year, 190 days </Td> <Td> 2002 - 2003 </Td> <Td> 0 </Td> </Tr> <Tr> <Td> 21 </Td> <Td> Blake, Edward Edward Blake </Td> <Td> 7002310000000000000 ♠ 310 days! 310 days </Td> <Td> 1871 - 1872 </Td> <Td> </Td> </Tr> <Tr> <Td> 22 </Td> <Td> Conant, Gordon Daniel Gordon Daniel Conant </Td> <Td> 7002209000000000000 ♠ 209 days! 209 days </Td> <Td> 1942 - 1943 </Td> <Td> 0 </Td> </Tr> <Tr> <Td> 23 </Td> <Td> Kennedy, Thomas Laird Thomas Laird Kennedy </Td> <Td> 7002197000000000000 ♠ 197 days! 197 days </Td> <Td> 1948 - 1949 </Td> <Td> 0 </Td> </Tr> <Tr> <Td> 24 </Td> <Td> Miller, Frank Frank Miller </Td> <Td> 7002138000000000000 ♠ 138 days! 138 days </Td> <Td> 1985 </Td> <Td> </Td> </Tr> <Tr> <Td> 25 </Td> <Td> Nixon, Harry Harry Nixon </Td> <Td> 7001910000000000000 ♠ 91 days! 91 days </Td> <Td> 1943 </Td> <Td> 0 </Td> </Tr> </Table> <Tr> <Th> Rank </Th> <Th> Premier </Th> <Th> Incumbency </Th> <Th> Dates in Power </Th> <Th> Mandates </Th> </Tr>

List of premiers of ontario by time in office
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