Ontario Place was a multiple use entertainment and seasonal amusement park in Toronto, Ontario, and owned by the Crown in Right of Ontario. Located on the shore of Lake Ontario, just south of Exhibition Place, it is approximately 4 km west of downtown Toronto. Opened on May 22, 1971, it consists of three artificially constructed, landscaped islands. Attractions were spread throughout the park, as well as walking trails and food and drink concessions.

The provincial government announced that most facilities would be shut down, in anticipation of a major redevelopment of the site in time for Canada's sesquicentennial in 2017. The marina, Molson Amphitheatre, and Atlantis event complex will remain open, as will parking facilities, but the remainder of Ontario Place—including the water park and the Cinesphere (world's first permanent IMAX theater)—are being decommissioned starting immediately. The key goal of the revitalization is to move from a summer-only schedule to a complex that is active year-round. Also high on the list of priorities are maximizing public access to the waterfront, ensuring strong transportation connections to the city, and ensuring that design standards for any new construction are “of the calibre to be considered city and provincial landmarks.”