This is a list of National Historic Sites (French : Lieux historiques nationaux) in its capital city, Ottawa, Ontario. There are 26 National Historic Sites in Ottawa,  of which two (Laurier House and the Rideau Canal) are administered by Parks Canada (identified below by the beaver icon ).  The Rideau Canal, which extends to Lake Ontario at Kingston, was designated in 1925 and was the first site designated in Ottawa. 
There are six other National Historic Sites located within the National Capital Region, but not within Ottawa proper: the Former Almonte Post Office and Rosamond Woollen Mill in Almonte, the Gillies Grove and House in Arnprior, the Manoir Papineau in Montebello, the Symmes Hotel in the Aylmer sector of Gatineau, and the First Geodetic Survey Station in Chelsea.
Numerous National Historic Events also occurred in Ottawa, and are identified at places associated with them, using the same style of federal plaque which marks National Historic Sites. Several National Historic Persons are commemorated throughout the city in the same way. The markers do not indicate which designation—a Site, Event, or Person—a subject has been given. National Historic Sites located elsewhere in Ontario are listed at National Historic Sites in Ontario.
This list uses names designated by the national Historic Sites and Monuments Board, which may differ from other names for these sites.
|Aberdeen Pavilion ||1898 (completed)||1983|| Ottawa |
45°24′0.15″N75°40′58.16″W / 45.4000417°N 75.6828222°W
|The only large-scale exhibition building in Canada surviving from the 19th century, and also the oldest surviving venue in which the Stanley Cup was contested|
|Beechwood Cemetery ||1873 (established)||2000|| Ottawa |
45°26′49″N75°39′36″W / 45.4469°N 75.6599°W
|An exceptional example of 19th-century cemetery design, containing a concentration of mausolea, monuments, and markers of significant importance to the history of Canada, Ontario and Ottawa; the cemetery was declared the national cemetery of Canada in 2009. It has served as the national military cemetery since 1944 and the RCMP's national memorial cemetery since 2004.|
|Billings House ||1829 (completed)||1968|| Ottawa |
45°23′23″N75°40′20″W / 45.389832°N 75.672235°W
|One of Ottawa's oldest homes, this Georgian homestead was built by Braddish Billings, the first settler of Gloucester Township, where his home formed the nucleus of Ottawa's Billings Bridge area|
|Central Chambers ||1891 (completed)||1990|| Ottawa |
45°25′23.65″N75°41′42.95″W / 45.4232361°N 75.6952639°W
|A noted example of Queen Anne Revival commercial architecture, with a high profile location on Confederation Square|
|Central Experimental Farm ||1886 (established)||1997|| Ottawa |
45°22′57″N75°42′49″W / 45.382537°N 75.713654°W
|A rare example of a farm within a city; the site of significant scientific contributions to agriculture|
|Château Laurier  ||1912 (completion of first wing)||1980|| Ottawa |
45°25′32.04″N75°41′42.39″W / 45.4255667°N 75.6951083°W
|One of Canada's landmark railway hotels, built in the distinctly Canadian Château-style; dubbed the "Third Chamber of Parliament" due to its proximity to Parliament Hill|
|Confederation Square ||1939 (established)||1984|| Ottawa |
45°25′26.72″N75°41′43.8″W / 45.4240889°N 75.695500°W
|The second most important ceremonial centre in Ottawa, after Parliament Hill, with Canada's National War Memorial at its centre and the Valiants Memorial at its periphery, and framed by the Château Laurier, the Government Conference Centre, the National Arts Centre, the Central Chambers, the Scottish-Ontario Chambers, the Central Post Office, the Langevin Block and the East Block|
|Connaught Building ||1916 (completed)||1990|| Ottawa |
45°25′36″N75°41′41″W / 45.426562°N 75.694669°W
|A testament to Wilfrid Laurier’s commitment to enhance the architecture in Canada's capital; one of the best works of David Ewart, the Chief Dominion Architect from 1896 to 1914|
|Diefenbunker / Central Emergency Government Headquarters ||1959 (completed)||1994|| Ottawa |
45°21′06″N76°02′50″W / 45.35167°N 76.04722°W
|An underground 4-storey bunker, capable of withstanding a near-hit from a nuclear explosion, built to shelter key Canadian political and military personnel in the event of a nuclear war, now a museum|
|Earnscliffe ||1857 (completed)||1960|| Ottawa |
45°26′15″N75°41′56″W / 45.437378°N 75.698912°W
|A house overlooking the Ottawa River, once the home to Canada's first Prime Minister, Sir John A. Macdonald, now the official residence of the British High Commissioner to Canada|
|Former Archives Building ||1906 (completed)||1990|| Ottawa |
45°25′50″N75°41′55.89″W / 45.43056°N 75.6988583°W
|The home of the Public Archives of Canada from 1906 to 1967, and the Canadian War Museum from 1967 to 2005, this building was constructed as part of Prime Minister Sir Wilfrid Laurier’s efforts to transform Ottawa from a lumber town into a capital city with requisite cultural and civic amenities and architecture|
|Former Geological Survey of Canada Building ||1863 (completion of the oldest part of the building)||1955|| Ottawa |
45°25′35.45″N75°41′38.16″W / 45.4265139°N 75.6939333°W
|Among the oldest government buildings in the capital, the building was the first Ottawa home of the Geological Survey of Canada; the building was also used to host the inaugural exhibit of the Canadian Academy of Arts in 1880 (the genesis of the collection of the National Gallery of Canada), and to display the Geological Survey's museum collections (which served as the foundation of the Canadian Museum of Nature)|
|Former Ottawa Teachers' College ||1875 (completed)||1974|| Ottawa |
45°25′11.97″N75°41′27.35″W / 45.4199917°N 75.6909306°W
|A nationally significant example of the Gothic Revival style in an eclectic design; the building served as a normal school until 1974, and now serves as a wing of Ottawa City Hall|
|Hart Massey House ||1959 (completed)||2018|| Ottawa |
45°27′05″N75°40′18″W / 45.451356°N 75.671683°W
|Built in 1959, Hart Massey House is an iconic example of mid-20th century modernism in residential architecture, and an example of International style because of its sensitivity to its natural surroundings.|
|John R. Booth Residence ||1909 (completed)||1990|| Ottawa |
45°25′00″N75°41′33″W / 45.416762°N 75.692480°W
|Built for lumber baron John R. Booth, the house is a nationally significant example of the Queen Anne Revival style in domestic architecture|
|Langevin Block ||1889 (completed)||1977|| Ottawa |
45°25′25.23″N75°41′49.42″W / 45.4236750°N 75.6970611°W
|One of the finest examples of Second Empire style office building architecture in Canada, the Langevin Block was the first purpose-built office building erected by the federal government outside the boundaries of Parliament Hill; currently serves as home to the Prime Minister's Office and the Privy Council Office|
|Laurier House ||1878 (completed)||1956|| Ottawa |
45°25′40″N75°40′41″W / 45.4277°N 75.6781°W
|As Canada did not have official residences for elected officials until 1950, this house was the home of Sir Wilfrid Laurier and then William Lyon Mackenzie King during the periods when each was leader of the Liberal Party of Canada; Laurier and King each served both as Prime Ministers and Leaders of the Opposition while living in this home|
|Maplelawn & Gardens ||1834 (completed)||1989|| Ottawa |
45°23′17.63″N75°45′43.02″W / 45.3882306°N 75.7619500°W
|A rare example of an early 19th-century country estate in Canada and an excellent example of the British classical style; the gardens are the best preserved of the few surviving examples of 19th-century walled gardens in Canada|
|National Arts Centre ||1969 (completed)||2006|| Ottawa |
45°25′23″N75°41′38″W / 45.4230°N 75.6938°W
|Built to commemorate the Canadian Centennial and designed in the shape of hexagons, the centre heralded Canada's cultural and architectural achievements in the second half of the 20th century; also a component of the Confederation Square National Historic Site of Canada|
|Notre-Dame Roman Catholic Basilica ||1842-1897 (construction)||1990|| Ottawa |
45°25′47″N75°41′47″W / 45.42971°N 75.69646°W
|A Basilica prominently located on Sussex Drive, whose twin towers mark the entrance to Lower Town, one of Ottawa's earliest neighbourhoods; it is considered an exceptional example of Gothic Revival architecture in Canada|
|Parliament Buildings ||1865 (West Block completed), 1866 (East Block), 1876 (Library of Parliament), 1920 (Centre Block)||1976|| Ottawa |
45°25′29″N75°41′57″W / 45.4248°N 75.6992°W
|The seat of the Parliament of Canada in a striking location on a hill above the Ottawa River; an important symbol serving as the physical embodiment of the Canadian government and federation|
|Public Grounds of the Parliament Buildings ||1875 (initial completion)||1976|| Ottawa |
45°25′29″N75°41′57″W / 45.424807°N 75.699234°W
|The focal point for national celebrations in Ottawa; the grounds were originally designed by Calvert Vaux, and since supplemented by 18 monuments and memorials|
|Rideau Canal ||1837 (completed)||1925|| Ottawa to Kingston |
45°25′33″N75°41′50″W / 45.42583°N 75.69722°W
|Built for the British government by Lieutenant-Colonel John By as a defensive work in the event of war with the United States, the still-functioning canal is the best preserved example of a 19th-century slack water canal in North America, with most of its original structures intact; a World Heritage Site and a unique historic landmark in the central core of Ottawa|
|Rideau Hall and Landscaped Grounds ||1838 (completion of original villa)||1977|| Ottawa |
45°26′39.73″N75°41′9.5″W / 45.4443694°N 75.685972°W
|The official Ottawa residence of the Governor General of Canada and the Canadian monarch; excellent example of the transposition of the natural style of the English country estate to Canada|
|Royal Canadian Mint ||1908 (completion of main building)||1979|| Ottawa |
45°25′52.14″N75°41′57.36″W / 45.4311500°N 75.6992667°W
|Representative of the federal government's approach to using the Tudor Gothic architectural style to create a distinctive identity in Canada's capital; the construction of this building, combining a mint and a refinery for gold produced by Canadian mines, symbolized the patriation of control over Canada's currency from Britain|
|Victoria Memorial Museum ||1911 (completed)||1990|| Ottawa |
45°24′46″N75°41′20″W / 45.41266°N 75.68875°W
|Built to house Canada's first national museum, the building originally served as the home of the National Gallery of Canada and of the geological and natural history collections of the Geological Survey of Canada, and then served as the temporary premises of the Parliament of Canada from 1916 to 1922 when the original Centre Block was destroyed by fire; now the home of the Canadian Museum of Nature|
The Fairmont Château Laurier is a 660,000-square-foot (61,000 m2) hotel with 429 guest rooms in the downtown core of Ottawa, Ontario, Canada, located near the intersection of Rideau Street and Sussex Drive and designed in a French Gothic Revival Châteauesque style to complement the adjacent Parliament buildings. The hotel is above the Colonel By Valley, home of the Ottawa Locks of the Rideau Canal, and overlooks the Ottawa River. The main dining room overlooks Major's Hill Park. The reception rooms include the Wedgewood-blue Adam Room; the Laurier Room defined by Roman columns; the Empire-style ballroom and the Drawing Room featuring cream and gold plaster ornament. The hotel was designated a national historic site in 1980.
National Historic Sites of Canada are places that have been designated by the federal Minister of the Environment on the advice of the Historic Sites and Monuments Board of Canada (HSMBC), as being of national historic significance. Parks Canada, a federal agency, manages the National Historic Sites program. As of July 2021, there were 999 National Historic Sites, 172 of which are administered by Parks Canada; the remainder are administered or owned by other levels of government or private entities. The sites are located across all ten provinces and three territories, with two sites located in France.
Laurier House is a National Historic Site in Ottawa, Ontario, Canada. It was formerly the residence of two Canadian prime ministers: Sir Wilfrid Laurier and William Lyon Mackenzie King. The home is now a historic house museum that is open to the public for guided tours from Victoria Day in May until Thanksgiving in October. Its address is 335 Laurier Avenue East.
Major's Hill Park is a park in downtown Ottawa, Ontario. The park stands above the Rideau Canal at the point where it enters the Ottawa River. The parliament buildings can be seen across the canal to the west, to the north of the park is the National Gallery of Canada, and to the east are the United States embassy and the Byward Market. To the south is the Chateau Laurier hotel, built on land that was once part of the park.
Downtown Ottawa is the central area of Ottawa, Ontario, Canada. It is sometimes referred to as the Central Business District and contains Ottawa's financial district. It is bordered by the Ottawa River to the north, the Rideau Canal to the east, Gloucester Street to the south and Bronson Avenue to the west. This area and the residential neighbourhood to the south are also known locally as 'Centretown'. The total population of the area is 4,876.
The Plaza Bridge in Ottawa, Ontario, Canada, is an automotive and pedestrian bridge that crosses the Rideau Canal just south of the Ottawa locks. It joins Wellington Street and Elgin Street in the Downtown core to the west with Rideau Street to the east. The Chateau Laurier abuts the bridge at the east end, while Parliament Hill is just beyond the west end. It is the northernmost bridge over the canal, just north of the Mackenzie King Bridge.
Confederation Square is an urban square in Ottawa, Ontario, Canada, and is considered the second most important ceremonial centre in Canada's capital city, after Parliament Hill. Roughly triangular in area, with Canada's National War Memorial at its centre and the Valiants Memorial at its periphery, the square is bounded by Wellington Street to the north and branches of Elgin Street to the east and west.
Persons of National Historic Significance are people designated by the Canadian government as being nationally significant in the history of the country. Designations are made by the Minister of the Environment on the recommendation of the Historic Sites and Monuments Board of Canada. Approximately 70 nominations are submitted to the board each year. A person is eligible to be listed 25 years after death, but Prime Ministers may be designated any time after death. Parks Canada administers the program, and installs and maintains the federal plaques commonly erected to commemorate each person, usually placed at a site closely associated with them. The intent is generally to honour the person's contribution to the country but is always to educate the public about that person.
Edgar Lewis Horwood (1868–1957) was a Canadian architect who served as Chief Dominion Architect from 1915 to 1917.
The Colonel By Valley, also known as Entrance Valley is a valley located at the confluence of the Rideau Canal and the Ottawa River, in the heart of Ottawa, Ontario, Canada. The valley is flanked on the west by Parliament Hill and on the east by the Chateau Laurier. The valley is home to a series of locks, known as the "Ottawa Locks" in the canal, as it descends into the Ottawa River. The valley is also home to the Commissariat Building, home of the Bytown Museum, the oldest stone building still standing in the city.