York South—Weston (French: York-Sud—Weston) is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada since 1979.

Located in the west-end of Toronto, the riding is made up largely of the old City of York, a southwestern portion of the old city of North York, Weston, and parts of the old city of Toronto north of High Park. The riding has a largely working class and immigrant population.

Its geographic boundaries are the part of the City of Toronto bounded by a line drawn from Humber River east along Highway 401, south along the Canadian National Railway situated west of Caledonia Road, west along Rogers Road, southeast along Old Weston Road, west along Lavender Road, south along Keele Street, southeast along the Canadian National/Canadian Pacific Railway, west along the Canadian Pacific Railway, and north along the Humber River to Highway 401.

York South—Weston was created in 1976 from parts of York South, York West, Davenport, High Park—Humber Valley, and Etobicoke ridings.

Its new boundaries were originally of the part of Metropolitan Toronto bounded by a line drawn from Eglinton Avenue West north along Keele Street, west along Lawrence Avenue West, south along the Humber River, east and north along the north limit of the City of Toronto, south along Runnymede Road, east along Annette Street, south along Keele Street, east along Humberside Avenue, northwest along the Canadian National Railway, east along the north limit of the City of Toronto, north along the east side of Prospect Cemetery, and west along Eglinton Avenue West to Keele Street.

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