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This list of tallest buildings in Ontario ranks skyscrapers and high rise buildings in the province of Ontario by height. Buildings in seven cities are included in this list; Toronto, Mississauga, Niagara Falls, Hamilton, London, Ottawa and Windsor, each having buildings taller than 110 meters.
The tallest building in the province of Ontario is First Canadian Place 298 meters (978 feet). Completed in 1976, it is also the tallest building in Canada and the 68th tallest building in the world. At the time of its completion, it was the tallest building in the world outside of Chicago and New York City.
Buildings over 150 meters
All of the buildings taller than 150 meters are in Toronto, Mississauga and Niagara Falls, all three cities being part of the Golden Horseshoe. The tallest building in Ottawa, Ontario's second largest city, rises to only 112.4 meters due to height restrictions put in place as to prevent any building from exceeding the height of the Peace Tower of parliament hill in Downtown Ottawa.