Downtown Ottawa (French: Centre-Ville) is the central area of Ottawa, Ontario, Canada. Like other downtowns it is the commercial and economic centre of the city. 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'.

Downtown Ottawa is dominated by government buildings, including Parliament Hill and the Supreme Court. Most prominent buildings are situated along Wellington, Sparks and Elgin streets. Most of the buildings are office towers containing the various government departments. While most of Ottawa's high tech industry is based elsewhere it also has a significant presence in the downtown core. The downtown also contains a number of apartments, hotels, and condominiums as well as the older single family homes and townhouses along its edges.

Ottawa (ⁱ/ˈɒtəwɑː/ or /ˈɒtəwə/) is the capital of Canada. It is the second largest city in Ontario and the fourth largest city in the country. The city is located on the south bank of the Ottawa River in the eastern portion of Southern Ontario. Ottawa borders Gatineau, Quebec, located on the north bank of the Ottawa River; together they form the National Capital Region (NCR).

Founded in 1826 as Bytown and incorporated as "Ottawa" in 1855, the city has evolved into a political and technological centre of Canada. Its original boundaries were expanded through numerous minor annexations and ultimately replaced by a new city incorporation and major amalgamation in 2001 which significantly increased its land area. The name "Ottawa" is derived from the Algonquin word adawe, meaning "to trade". Initially an Irish and French Christian settlement, Ottawa has become a multicultural city with a diverse population.

The 2011 census had the city's population as 883,391, and the metropolitan population as 1,236,324.Mercer ranks Ottawa with the second highest quality of living of any large city in the Americas, and 14th highest in the world. It is also rated the second cleanest city in Canada, and third cleanest city in the world. In 2012, the city was ranked for the third consecutive year as the best community in Canada to live in by MoneySense.