Isaac Brock, English general and politician, Lieutenant Governor of Upper Canada (died 1812)

Major-General Sir Isaac Brock KB was a British Army officer and colonial administrator from Guernsey. He is best remembered for his victory at the siege of Detroit and his death at the Battle of Queenston Heights during the War of 1812.

The following is a list of lieutenant governors of Ontario and the lieutenant governors of the former colony of Upper Canada. The office of Lieutenant Governor of Ontario was created in 1867, when the Province of Ontario was created upon Confederation. The predecessor office, lieutenant governor of Upper Canada, was a British colonial officer, appointed by the British government to administer the government of the colony, from 1791 to 1841.