This is a list of Lieutenant Governors of the Canadian province of Ontario.

Lieutenant Governors of Upper Canada

Upper Canada was created out of the western part of Quebec by the Constitutional Act of 1791.

(*) Military administrators during the War of 1812

(**)Lord Sydenham was also Governor General of Canada when Upper Canada and Lower Canada united into the Province of Canada. Upper Canada became Canada West and Lower Canada became Canada East.

Lieutenant Governors of Canada West

After Richard Downes Jackson, the Lieutenant Governors were also simultaneously Governors General.

The Province of Canada was split into Ontario and Quebec after Canadian Confederation in 1867.

Lieutenant Governors of Ontario