York North

York North was a federal riding in Ontario, Canada, represented in the House of Commons of Canada in all thirty-seven parliaments from Confederation in 1867 until 2004. Its elimination in 2004 left Simcoe North as the only federal electoral district in Ontario to have been in continual existence since Canadian Confederation. Remarkably, York North's provincial counterpart similarly maintained continuous representation in the Legislative Assembly of Ontario in all thirty-eight Ontario parliaments between Confederation and 2007, and was the only provincial district to have maintained its continual existence after 1999.

York North was abolished by the 2003 redistribution process, and ceased to be in existence upon the dissolution of the 37th Parliament in May 2004. Its territory was redistributed to the new ridings of Newmarket—Aurora, Oak Ridges—Markham (only a small portion), and to the resurrected York—Simcoe (the vast rural portion), the riding previously replaced by York North in 1996. Its provincial counterpart was similarly abolished upon the dissolution of the 38th Ontario Parliament in June 2007.

The electoral district held a unique distinction for having two candidates from a single election declared elected, seated in parliament and unseated by court ruling before the term was over. Prior to the Supreme Court of Canada's February 2026 decision that invalidated the 1-vote election victory in Terreborne in the 2025 federal election, the ordeal stemming from York North's election in 1988 was the most recent federal contest to have been overturned for reasons other than a recount.

It was also among a small group of electoral districts that had been represented by a sitting prime minister, and even more still it is among just a small handful that had dealt its prime ministerial MP a local defeat.

While its final incarnation consisted mostly of the more rural area that lied actually in the northern portion of York Region, York North covered an collection of communities in the southern end of the region that are now commonly considered northern suburbs of the city of Toronto through much of the later half of the twenty century, such as Vaughan, Richmond Hill, Woodbridge, Stouffville and Markham. Its territory even reached into the modern City of Toronto for two periods, with a portion of the former township of North York being part of the riding in four general elections.