Dufferin Street is a major north–south street in Toronto, Vaughan and King, Ontario, Canada. It is a concession road, two concessions (4 km) west of Yonge Street. The street starts at Exhibition Place, continues north to Toronto's northern boundary at Steeles Avenue with some discontinuities and continues into Vaughan, where it is designated York Regional Road 53. The street is named for Frederick Hamilton-Temple-Blackwood, 1st Marquess of Dufferin and Ava, who served as Governor General of Canada from 1872 to 1878. Prior to 1878 the street was labelled as Western City Limits or Sideline Road south off Bloor. In 2003 and 2007, it was voted as one of "Ontario's Worst 20 Roads" in the Ontario's Worst Roads poll organized by the Canadian Automobile Association.

Vaughan is a city in Ontario, Canada. It is located in the Regional Municipality of York, just north of Toronto. Vaughan was the fastest-growing municipality in Canada between 1996 and 2006 with its population increasing by 80.2% during this time period and having nearly doubled in population since 1991. It is the fifth-largest city in the Greater Toronto Area, and the 17th-largest city in Canada.