Ontario
| Building | Height |
Floors | Built | City | Architect | |
|---|---|---|---|---|---|---|
| Mohawk Chapel | 1785 | Brantford | ||||
| Hawley House | 1785 | Bath | ||||
| Fairfield House | 1793 | Amherstview | ||||
| Fort York | 1793 | Toronto | ||||
| Battlefield House | 2 | 1796 | Hamilton,Ontario | |||
| Duff Baby House | 2 | 1798 | Windsor | |||
| Rochleau House | 3 | 1808 | Kingston | |||
| François Baby House | 2 | 1812 | Windsor | |||
| Joseph Schneider Haus | 2 | 1816 | Kitchener | |||
| The Grange | 3 | 1817 | Toronto | D'Arcy Boulton Jr | ||
| Ham House | 2 | 1816 | Bath | |||
| St Mark's Anglican Church | 1822 | Port Hope | ||||
| John Moore House | 2 | 1824 | Sparta, Ontario | |||
| Stone House currently the Bytown Museum | 3 | 1827 | Ottawa | Thomas McKay | ||
| Sharon Temple | 1832 | Sharon, Ontario | Ebenezer Doan | |||
| Fort Henry | 1832 | Kingston | Royal Engineers | |||
| McKinnon-Eakin House | 2 | 1835 | (Unionville) Markham, Ontario | |||
| Rideau Hall | 2 | 1838 | Ottawa | Thomas McKay | ||
| Bellevue House | 3 | 1840 | Kingston | Charles Hales | ||
| Dominion House | 2 | Before 1850 | Windsor | Jimmy Switchblade | ||
| Paris Old Town Hall | 3 | 1854 | Paris, Ontario | |||
| Mackenzie Hall | 1856 | Windsor | ||||
| Canadian Parliament | 92 | 13 | 1865 | Ottawa | John A. Pearson & Marchand | |
| Pepper Hill | 1870 | Carlisle | Unknown | |||
| St. James Cathedral | 93 | 1874 | Toronto | Frederick Cumberland and Thomas Ridout | ||
| Mackenzie Building Royal Military College of Canada | 1878 | Kingston | Robert Gage | |||
| Ontario Legislature | 55 | 5 | 1893 | Toronto | ||
| Old City Hall | 104 | 5 | 1899 | Toronto | E. J. Lennox | |
| King Edward Hotel | 72 * | 18 | 1903 | Toronto | E. J. Lennox | |
| Canadian Northern Railway Station | 3 | 1906 | Thunder Bay | Ralph B. Bratt | ||
| Canadian Pacific Building | 60 * | 15 | 1911 | Toronto | Frank Darling & John A. Pearson | |
| Prince Arthur Hotel | 32 | 6 | 1911 | Thunder Bay | ||
| Canadian Museum of Nature | 50 | 4 | 1912 | Ottawa | ||
| Chateau Laurier | 57 | 11 | 1912 | Ottawa | Ros | |
| Whalen Building | 35 | 8 | 1913 | Thunder Bay | Brown and Vallance of Montreal | |
| Currie Building Royal Military College of Canada | 1922 | Kingston | ||||
| National Building* (demolished Dec. 11, 2006; facades to be re-erected as part of future Bay Adelaide Centre) | 48 * | 12 | 1926 | Toronto | Chapman and Oxley | |
| Queen's Quay Terminal | 43 | 13 | 1926 | Toronto | Moores & Dunford | |
| Pigott Building | 64 | 18 | 1929 | Hamilton | Prack & Prack | |
| Royal York Hotel | 124 | 28 | 1929 | Toronto | Ross and MacFarlane | |
| Tip Top Lofts | 48 | 11 | 1929 | Toronto | ||
| Old Toronto Star Building* | 88 * | 22 | 1929 | Toronto | Chapman and Oxley | |
| Royal Edward Arms | 35 | 8 | 1929 | Thunder Bay | Dorr and Dorr | |
| Canada Permanent Trust Building | 77 | 18 | 1930 | Toronto | FHilton Wilkes | |
| Commerce Court North Building | 145 | 34 | 1930 | Toronto | John A. Pearson | |
| Private Patients Pavilion (Bell Wing)* Toronto General Hospital | 40 * | 10 | 1930 | Toronto | Frank Darling & John A. Pearson | |
| Victory Building | 80 * | 20 | 1930 | Toronto | Baldwin & Greene | |
| Canada Life Building | 87 | 15 | 1931 | Toronto | Henry Sproatt & Ernest Rolph | |
| Maple Leaf Gardens | 50 | 1931 | Toronto | Ross and MacFarlane | ||
| Christ the King Cathedral | 52 | 1933 | Hamilton | Hutton & Souter | ||
| Whitney Block | 64 * | 16 | 1933 | Toronto | John M. Lyle, Matthers & Halderly | |
| Princess Margaret Hospital | 72 * | 18 | 1935 | Toronto | ||
| Supreme Court of Canada | 47 | 4 | 1939 | Ottawa |
Read more about this topic: List Of Oldest Buildings In Canada