| St. Mark's Church | |
|---|---|
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 | |
| 43°15′20″N 79°04′09″W / 43.2554834°N 79.0692042°W | |
| Address | 41 Byron Street, Niagara-on-the-Lake, Ontario, Canada |
| Denomination | Anglican Church of Canada |
| Website | stmarksnotl |
| History | |
| Founded | 1792 |
| Consecrated | 1828 |
| Architecture | |
| Style | Gothic Revival |
| Years built | 1809; 1822–1826 |
| Administration | |
| Province | Ontario |
| Diocese | Niagara |
| Clergy | |
| Rector | The Rev. Leighton Lee |
St. Mark's Church is a historic Anglican church in Niagara-on-the-Lake, Ontario, Canada. It is the oldest church in the Diocese of Niagara and the second oldest Anglican church in Ontario.