King's Highway 11, commonly referred to as Highway 11, is a provincially-maintained highway in the Canadian province of Ontario. At 1,784.9 kilometres (1,109.1 mi), it is the second-longest highway in the province, after Highway 17. Highway 11 begins at Highway 400 in Barrie and arches through northern Ontario to the Canada–United States border at Rainy River via Thunder Bay; the road continues as Minnesota State Highway 72 across the Baudette–Rainy River International Bridge. North and west of North Bay (as well as for a short distance through Orillia), Highway 11 forms part of the Trans-Canada Highway and is part of MOM's Way between Thunder Bay and Rainy River.
The original section of Highway 11 along Yonge Street was colloquially known as "Main Street Ontario" and was one of the first roads in what would later become Ontario. It was devised as an overland military route between York (Toronto) and Penetanguishene. Yonge Street serves as the east–west divide throughout York Region and Toronto.