York South was an electoral district (or "riding") in Ontario, Canada, that was represented in the House of Commons of Canada from 1904 to 1979.

Quick Facts Ontario electoral district, Defunct federal electoral district ...

York South

Ontario electoral district
Defunct federal electoral district
Legislature	House of Commons
District created	1903
District abolished	1966
First contested	1904
Last contested	1965

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The riding is notable for the 1942 federal by-election in which newly elected Conservative leader Arthur Meighen was defeated in his attempt to win a seat in the House of Commons by the Co-operative Commonwealth Federation's (CCF) candidate (assisted by the Liberals). The election was a major breakthrough for the CCF, and ended Meighen's attempt to return to politics. In later years, it became known as perennial leaders' riding, the home district for both CCF and New Democratic Party (NDP) leaders Ted Jolliffe, Donald C. MacDonald, David Lewis and Bob Rae.

York South was created in 1903 as "the south riding of York" from parts of York East and York West ridings. It initially consisted of the township of York, and the towns of East Toronto, North Toronto, and Toronto Junction. As is suggested by the names of the towns in the riding, the constituency abutted on the city of Toronto's northern border.

In 1914, it was called "South York", and redefined to consist of the villages of Richmond Hill and Markham, the township of Markham, the town of Leaside, and the township of York (excluding parts included in the riding of West York); and those portions of the city of Toronto not included in the ridings of West York, Parkdale, North Toronto, East Toronto, Centre Toronto, West Toronto, South Toronto and East York. In 1924, it was called "York South", and consisted of all that part of the county of York lying east of Yonge Street, south of the township of Markham and outside the city of Toronto.

In 1933, York South was defined to consist of all that portion of the township of York not included in the electoral district of West York, the town of Weston and the village of Forest Hill. From 1947, it consisted of the village of Forest Hill and a portion of the township of York. In 1952, it consisted the village of Forest Hill and a re-defined portion of the township of York.

As time progressed and the population grew, the riding shrank in size so that it consisted of what was later called the Borough of York in the middle western part of Metropolitan Toronto and some surrounding areas. While it was originally a largely rural riding it was an urban, working class riding by the end of World War II.

The electoral district was abolished in 1976 when the main part of the riding became York South—Weston, and other parts were redistributed between Davenport, Eglinton—Lawrence and St. Paul's ridings.

This riding elected the following members of the House of Commons of Canada:

• York South entry on the House of Commons website includes election results and the changing descriptions of the riding's boundaries.