List of tallest buildings in Ontario

The tallest building in the province of Ontario is First Canadian Place 298 metres (978 feet).

At the time of its completion, it was the tallest building in the world outside of Chicago and New York City.

In recent years, a development boom has caused many cities, that historically haven’t had tall buildings or dense urban cores, to densify and construct taller buildings like Kitchener, Windsor, Markham, etc.

This list ranks buildings in Ontario that stand between least 100 m (328 ft) tall, based on CTBUH height measurement standards.

Freestanding observation and/or telecommunication towers, while not habitable buildings, are included for comparison purposes; however, they are not ranked.