Olympic Stadium () is a multi-purpose stadium in Montreal, Canada, located at Olympic Park in the Hochelaga-Maisonneuve district of the city. Built in the mid-1970s as the main venue for the 1976 Summer Olympics, it is nicknamed "The Big O", a reference to both its name and to the doughnut-shape of the permanent component of the stadium's roof. The tower standing next to the stadium, The Montreal Tower, is the tallest inclined tower in the world with an angle elevation of 45 degrees. It is also called "The Big Owe" to reference the astronomical cost of the stadium and the 1976 Olympics as a whole.