File:Gardiner Expressway, Toronto, Ontario (30002925825).jpg

The Frederick G. Gardiner Expressway, commonly known as the Gardiner Expressway or simply the Gardiner, is a municipal expressway in Toronto, Ontario, Canada. Running close to the shore of Lake Ontario, it extends from the foot of the Don Valley Parkway (DVP) in the east, just past the mouth of the Don River, to the junction of Highway 427 and the Queen Elizabeth Way (QEW) in the west, for a total length of 18.0 kilometres (11.2 mi). East of Dufferin Street to just east of the Don River, the roadway is elevated for a length of 6.8 kilometres (4.2 mi), unofficially making it the longest bridge in Ontario. It runs above Lake Shore Boulevard east of Spadina Avenue.

The highway is named after the first chair of the now-defunct Metro Council, Frederick G. Gardiner, who championed it, the Don Valley Parkway and Spadina Expressway projects. The six-lane section east of the Humber River was built in segments from 1955 until 1964 by the Metropolitan Toronto government with provincial highway funds. The ten-lane section west of the Humber was formerly part of the QEW provincial highway. The Gardiner Expressway is now wholly owned and operated by the City of Toronto.

The condition of the highway has deteriorated over the years. The highway has been described as "an out-of-date, crumbling and frequently traffic-jammed freeway." Extensive repairs became necessary in the early 1990s, and significant commercial and residential development has occurred in the core. As a result of these, the Gardiner has been the subject of several proposals to demolish it or move it underground as part of downtown waterfront revitalization efforts. A section east of the Don River was demolished in 2001. The City of Toronto commissioned a study of possible options (keep, demolish, reconstruct) for the segment east of Jarvis Street to the Don River and City Council voted in June 2015 to rebuild the section.

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