List of National Historic Sites of Canada in Ontario
This is a list of National Historic Sites of Canada (French: Lieux historiques nationaux) in the province of Ontario. There are 269 sites designated in Ontario, 38 of which are administered by Parks Canada (identified below by the beaver icon 
). Of all provinces and territories, Ontario has the greatest number of National Historic Sites, and the largest number under Parks Canada administration, with a dense concentration in southern Ontario. The five largest clusters are listed separately:
There are related federal designations for National Historic Events and National Historic Persons.
Events, Sites, and Persons are each typically marked by a federal plaque, but the markers do not indicate which designation a subject has been given. The Rideau Canal is a Site, while the Welland Canal is an Event. The cairn and plaque to John Macdonell does not refer to a National Historic Person, but is erected because his home, Glengarry House, is a National Historic Site. Similarly, the plaque to John Guy officially marks not a Person, but an Event—the Landing of John Guy.
This list uses names designated by the Historic Sites and Monuments Board of Canada, which may differ from other names for these sites.
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