The Queensway (or Queensway) is a major street in the municipalities of Toronto and Mississauga, Ontario, Canada. It is a western continuation of Queen Street, after it crosses Roncesvalles Avenue and King Street in Toronto. The Queensway is a divided roadway from Roncevalles westerly until 600 metres (1,980 ft) of the South Kingsway (accessed by ramps) with its centre median dedicated to streetcar service. The road continues undivided west from there to Etobicoke Creek as a four- or six-lane thoroughfare.

After crossing the creek, it enters Mississauga under Peel Region jurisdiction as Peel Regional Road 20, as far west as Mavis Road, with the westernmost portion to Glengarry Road being a two-lane road maintained by the city. There is a road allowance with hydro lines, cutting into the Mississaugua Golf & Country Club on the shores of the Credit River. In the 1990s, the name Queensway was eliminated on the roads on this allowance west of the river. The street gives its name to Etobicoke's the Queensway–Humber Bay neighbourhood.

From 1953 to 1954, the Queensway was signed briefly as Highway 108 when it was under the then–Department of Highways from Highway 27 (prior to being renamed Highway 427) and the eastern end of the Queen Elizabeth Way (QEW). While the Highway 27-QEW interchange was reconstructed in the late 1960s, the QEW was temporarily diverted to an overpass that would later be permanently used for the Queensway.

The Queensway in Toronto was once named Queen Street and was officially the western part of the street in Old Toronto. There were three separate portions: the easternmost being a stub of the main section of Queen that continued west of Roncesvalles Avenue to Colborne Lodge Drive; a central section separated from it by a swampy area south of Grenadier Pond in High Park, running west of Ellis Avenue; and the westernmost running through the former Etobicoke west of the Humber River. The section west of the Humber was named the Queensway in 1941 to avoid confusion due to the break, but the name "Queen Street" was not restored after the present Queensway was completed to connect the sections of the formerly broken street. The most likely reason for this was because the then–Township of Etobicoke desired to pay homage to the original name, while creating a counterpart to another street named the Kingsway.

In Mississauga, the road is simply named "Queensway", with east and west designations on either side of Hurontario Street: Queensway East and Queensway West

For Highway 427's southbound express and collector carriageways, overhead exit signs formerly showed the Queensway as "Queensway Avenue", while present signs installed since the 2000s use the proper designation. The use of "Queensway Avenue" was likely to avoid confusion with adjacent exit signs for the parallel Queen Elizabeth Way (QEW) at the last collector-to-express transfer (and vice-versa), as after that point, the collector lanes had an off-ramp to the Queensway but no direct access to the QEW (with the express lanes being the opposite). In 2001, the collector lanes received a ramp to access the eastern QEW; nonetheless, there was no longer any need for the "Queensway Avenue" signage as the eastern QEW was re-designated the Gardiner Expressway as a result of 1998 provincial downloading. The old Queensway Avenue signage was still present mixed with the proper signs for a time after the downloading.

What would become the Queensway in Mississauga was formerly the Upper Middle Road (or the 1st Concession South of Dundas Street).

In 1931, work began to connect the former western section of Queen Street into The Middle Road across the Etobicoke Creek as part as the Toronto-Hamilton Highway that was the precursor to the Queen Elizabeth Way, which opened in 1937. In 1940, the present freeway alignment for the new QEW was opened to the south, and the road was given its present name the following year.