The Ontario federal electoral districts each elect one representative to the House of Commons. These districts are defined by Elections Canada. Their boundaries are also used for provincial electoral districts, with exceptions in Northern Ontario.
The following electoral districts are currently represented in the House of Commons.
The House of Commons of Canada is the lower house of the Parliament of Canada. Together with the Crown and the Senate of Canada, they comprise the bicameral legislature of Canada.
An electoral district in Canada is a geographical constituency upon which Canada's representative democracy is based. It is officially known in Canadian French as a circonscription but frequently called a comté (county). In Canadian English it is also colloquially and more commonly known as a riding or constituency.
Cambridge is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada since 1979.
Canada holds elections for legislatures or governments in several jurisdictions: for the federal (national) government, provincial and territorial governments, and municipal governments. Elections are also held for self-governing First Nations and for many other public and private organizations including corporations and trade unions. Municipal elections can also be held for both upper-tier and lower-tier governments.
Renfrew—Nipissing—Pembroke is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons since 1979.
Leeds—Grenville—Thousand Islands and Rideau Lakes is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons since 1979. Prior to the 2015 election, the riding was known as Leeds—Grenville.
Etobicoke Centre is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada since 1979.
Brantford—Brant is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada from 1904 to 1949 and since 1968.
Etobicoke North is a federal electoral district in Toronto, Ontario, Canada, that has been represented by one Member of Parliament in the House of Commons of Canada since 1979. It covers the neighbourhood of Rexdale, in the northern part of the Etobicoke district of Toronto.
Mississauga—Lakeshore is a federal electoral district in Peel Region, Ontario, Canada. It has been represented in the House of Commons of Canada since 1979.
Oshawa is a federal electoral district in Ontario, Canada, that is represented in the House of Commons of Canada. It currently consists of the City of Oshawa south of Taunton Road. Historically, the riding was dominated by a working-class electorate.
Durham is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada from 1904 to 1968 and since 1988.
Nipissing—Timiskaming is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada since 2004. The riding was formed by the amalgamation of the former Nipissing riding with the southeastern portion of the former Timiskaming—Cochrane riding. The 2011 electoral results in this riding were challenged in court on the grounds that there were "irregularities, fraud or corrupt or illegal practices that affected the result of the election".
Thornhill is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada since 1997. It covers its namesake Thornhill neighbourhood, which is split between the Cities of Vaughan and Markham. The Vaughan portion also includes parts of the city east of Highway 400 and south of Rutherford Road, including the largely industrial district of Concord and Vaughan's planned downtown; Vaughan Metropolitan Centre. The part in the City of Markham is restricted its portion of Thornhill itself west of Bayview Avenue. The riding was created in 1996 and the east end of the riding was split off into other ridings in 2012.
Thunder Bay—Superior North is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada since 1976.
Waterloo is the name of a federal electoral district in the Waterloo Region of Ontario, Canada, that has been used in the House of Commons of Canada from since 1968. Between 1997 and 2015, the riding was known as Kitchener—Waterloo.
Kenora—Rainy River is a provincial electoral district (riding) in northwestern Ontario, Canada, that has been represented in the Legislative Assembly of Ontario since 1999. It was created from Kenora, most of Rainy River and part of Lake Nipigon. The boundaries of the new district corresponded with the Kenora—Rainy River federal riding, until it was abolished in 2003. The provincial riding will continue to exist.
The federal electoral redistribution of 2012 was a redistribution of electoral districts ("ridings") in Canada following the results of the 2011 Canadian census. As a result of amendments to the Constitution Act, 1867, the number of seats in the House of Commons of Canada increased from 308 to 338. The previous electoral redistribution was in 2003.
James V. Maloney is a Canadian lawyer and politician, who was elected to the House of Commons of Canada in the 2015 election. He represents the electoral district of Etobicoke—Lakeshore as a member of the Liberal Party caucus. In September of 2023 he was appointed Parliamentary Secretary to the Minister of Justice and Attorney General.
The 45th Canadian federal election will take place on or before October 20, 2025, to elect members of the House of Commons to the 45th Canadian Parliament.