List of historic places in Ontario
This list of historic places in the province of Ontario contains heritage sites listed on the Canadian Register of Historic Places (CRHP), all of which are designated as historic places either locally, provincially, territorially, nationally, or by more than one level of government.
For reasons of length, the list has been divided by regions and subregions. See separate lists for the following areas:
- Central Ontario
- Eastern Ontario
- Golden Horseshoe
- Northern Ontario
- Southwestern Ontario
Ontario Heritage Act Register
The Ontario Heritage Trust maintains a register on their website (see here), "a searchable database that provides information about properties in Ontario that have been designated using the Ontario Heritage Act (OHA)." 
|Wikimedia Commons has media related to Cultural heritage monuments in Ontario.|
- "Ontario Heritage Act Register". Ontario Heritage Trust. Retrieved September 20, 2018.