Bayview Avenue is a major north-south route in the Greater Toronto Area of Ontario. North of Toronto, in York Region, Bayview is also designated as York Regional Road 34.
Bayview Avenue follows the first concession line, laid 6,600 ft (2,000 m) east of Yonge Street. Over time, the concession road became known as East York Avenue, a reference to the division it formed between the city of Toronto and the township of East York. In 1931, James Stanley McLean constructed Bay View overlooking the Don Valley on the edge of Moore Park.
On August 17, 1959, Bayview was extended south from Moore Avenue in Leaside to Front Street. The northern section of this extension was routed alongside Pottery Road to Nesbitt Drive. South of this, it wraps around a hill and descends into the Lower Don Valley, travelling parallel to the route of the Don Valley Parkway.
This addition is frequently referred to as the Bayview Extension. It was constructed as part of the Don Valley Parkway project, and necessitated the removal of "Sugarloaf Hill" directly north of the Bloor Street Viaduct. The extension fulfilled the "central spoke" in the building of the "Don Valley Roadway" as proposed in the 1940s. A route through the ravine to St. Clair Avenue was replaced with the present route which stays within the Don Valley proper. Bayview Avenue now terminates at the Corktown Common at Mill Street.