Ontarios viseguvernør (engelsk: Lieutenant Governor of Ontario) er den canadiske monarkens visekongelige representant i provinsen. Embetet ble innstiftet gjennom Constitution Act, 1867, som trådte i kraft 1. juli samme år.

Bilde	Navn (født–død)	Embetstid	Monark	Ref.
Lieutenant Governor of Ontario (Ontarios viseguvernør)
	Henry William Stisted (1817–1875)	1. juli 1867–14. juli 1868	Victoria	[1][2]
	William Pearce Howland (1811–1907)	15. juli 1868–11. november 1873		[1][2]
	John Willoughby Crawford (1817–1875)	12. november 1873–13. mai 1875 (døde)		[1][2]
Administrator of the Government of Ontario (Administrator for Ontarios regjering)
	William Buell Richards (1815–1889) Chief Justice of Ontario	13. mai 1875–18. mai 1875	Victoria	[3]
Lieutenant Governor of Ontario (Ontarios viseguvernør)
	Donald Alexander Macdonald (1817–1896)	18. mai 1875–30. juni 1880	Victoria	[1][2]
	John Beverley Robinson (1821–1896)	1. juli 1880–31. mai 1887		[1][2]
	Alexander Campbell (1822–1892)	1. juni 1887–24. mai 1892 (døde)		[1][2]
Administrator of the Government of Ontario (Administrator for Ontarios regjering)
	John Hawkins Hagarty (1816–1900) Chief Justice of Ontario	24. mai 1892–30. mai 1892	Victoria	[3]
Lieutenant Governor of Ontario (Ontarios viseguvernør)
	George Airey Kirkpatrick (1841–1899)	30. mai 1892–7. november 1896	Victoria	[1][2]
Administrator of the Government of Ontario (Administrator for Ontarios regjering)
	Casimir Stanislaus Gzowski (1813–1898)	7. november 1896–18. november 1897	Victoria	[1][2]
Lieutenant Governor of Ontario (Ontarios viseguvernør)
	Oliver Mowat (1820–1903)	18. november 1897–19. april 1903 (døde)	Victoria	[1][2]
			Edvard VII
Administrator of the Government of Ontario (Administrator for Ontarios regjering)
	Charles Moss (1840–1912) Chief Justice of Ontario	19. april 1903–21. april 1903	Edvard VII	[3]
Lieutenant Governor of Ontario (Ontarios viseguvernør)
	William Mortimer Clark (1836–1917)	21. april 1903–21. september 1908	Edvard VII	[1][2]
	John Morison Gibson (1842–1929)	22. september 1908–26. september 1914		[1][2]
			Georg V
	John Strathearn Hendrie (1857–1923)	2. oktober 1914–20. november 1919		[1][2]
	Lionel Herbert Clarke (1859–1921)	1. desember 1919–29. august 1921 (døde)		[1][2]
Administrator of the Government of Ontario (Administrator for Ontarios regjering)
	William Ralph Meredith (1840–1923) Chief Justice of Ontario	29. august 1921–10. september 1921	Georg V	[3]
Lieutenant Governor of Ontario (Ontarios viseguvernør)
	Henry Cockshutt (1868–1944)	10. september 1921–12. januar 1927	Georg V	[1][2]
	William Donald Ross (1869–1947)	12. januar 1927–25. oktober 1931 (bad om å bli fritatt fra embetet)		[1][2]
Administrator of the Government of Ontario Administrateur du gouvernement de l'Ontario (Administrator for Ontarios regjering)
	William Mulock (1843–1944) Chief Justice of Ontario	25. oktober 1931–1. november 1932	Georg V	[3]
Lieutenant Governor of Ontario (Ontarios viseguvernør)
	Herbert Alexander Bruce (1868–1963)	1. november 1932–23. november 1937	Georg V	[1][2]
			Edvard VIII
			Georg VI
	Albert Edward Matthews (1873–1949)	23. november 1937–26. desember 1946		[1][2]
	Frank Ray Lawson (1886–1980)	26. desember 1946–18. februar 1952		[1][2]
			Elizabeth II
	Louis Orville Breithaupt (1890–1960)	18. februar 1952–30. desember 1957		[1][2]
	John Keiller MacKay (1888–1970)	30. desember 1957–1. mai 1963		[1][2]
	William Earl Rowe (1894–1984)	1. mai 1963–4. juli 1968		[1][3]
	William Ross Macdonald (1891–1976)	4. juli 1968–10. april 1974		[1][3]
	Pauline Mills McGibbon (1910–2001)	10. april 1974–15. september 1980		[1][3]
	John Black Aird (1923–1995)	15. september 1980–20. september 1985		[1][3]
	Lincoln MacCauley Alexander (1922–2012)	20. september 1985–11. desember 1991		[1][3]
	Henry Newton Rowell Jackman (1932–)	11. desember 1991–24. januar 1997		[1][3]
	Hilary Mary Weston (1942–)	24. januar 1997–7. mars 2002		[1][2]
	James Karl Bartleman (1939–)	7. mars 2002–5. september 2007		[1][2]
	David Charles Onley (1950–2023)	5. september 2007–23. september 2014		[2]
	Elizabeth Dowdeswell (1944–)	23. september 2014–		[2]