York is a district and former city within Toronto, Ontario, Canada. It is located northwest of Old Toronto, southwest of North York and east of the Humber River.

Originally formed as York Township, it encompassed the southern section of York County. It was split several times, creating East York and North York. In 1953, it became part of the Metropolitan Toronto federation. It absorbed several municipalities, including Lambton Mills and Weston and was eventually known as the City of York. In 1998, it was dissolved along with Metro Toronto and its constituent municipalities, amalgamated to form the current City of Toronto.

Today, the area is integrated into the multicultural mosaic of Toronto. The area is home today to several ethnic enclaves such as Portuguese, Jamaican and Latin American neighbourhoods.

Teiaiagon, settled by the Iroquois on the eastern bank of the Humber River, where Baby Point is now, was the oldest known settlement on the land that would later become York Township.

York Township was first organized in 1793. Its initial boundaries were the Humber River to the west, in the east by what would become Victoria Park Avenue, and in the north by what would become Steeles Avenue. Etobicoke Township and Scarborough Township were located west and east, respectively, while the townships of Vaughan and Markham bordered on the north, and Lake Ontario on the south, minus the small Town of York. It was incorporated by Canada West in 1850 (Canada West later became Ontario in 1867, due to Confederation) within the new County of York.

York Township was home to one of the original Black communities in the Toronto area, which was populated by many African American fugitive slaves. By 1861, the township had the second-largest Black population in the Toronto area, after St. John's Ward, most of whom lived in York Township West (located west of Yonge Street and north of Bloor Street). The legacy of York's original Black community continues today; as of the 2016 Census, 17 percent of York's population is Black, the largest percentage of Toronto's six former municipalities.

From the period of 1850 onwards, individual villages developed such as Parkdale (1879) and Brockton (1881), which were later annexed into Toronto. The village of Weston was incorporated in 1882. Toronto Junction and East Toronto were incorporated in 1887, both later annexed by Toronto. The village of North Toronto was incorporated in 1889, annexed by Toronto in 1912. Other parts of York were directly annexed by Toronto, such as "The Annex", Riverdale, Rosedale, Seaton and Sunnyside in the 1880s and Bracondale, Deer Park, Wychwood, The Midway and Balmy Beach after 1905.

This pattern of absorption by Toronto ended as the City no longer wanted to take on the servicing costs of new suburbs. The Humewood–Cedarvale neighbourhood was developed in the 1910s to attract development in the growing township. Oakwood Village was also developed during this time. In the 1920s, the character of the township changed, with its southern reaches abutting the city of Toronto taking on a more urban character, compared with the very rural character of the north. The voters of the northern, rural part of York voted to secede, creating the new Township of North York in 1922. This was followed in 1923 by the incorporation of the village of Forest Hill, while the residents of Mount Dennis and Silverthorn voted to remain in York. The remaining two pockets of unincorporated urban development at the north end of the city, were split by the village of North Toronto, which was by then a part of the City of Toronto. Within years, the Province of Ontario saw that this arrangement of having an exclave was impractical, and further subdivided York, creating in 1924 the township of East York out of the eastern pocket.