The Olympic Stadium (French: Stade Olympique de Montréal) is a multi-purpose stadium in Canada, located in the Hochelaga-Maisonneuve district of Montreal, Quebec. 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 Big Owe" name has also been used to reference the astronomical cost of the stadium and the 1976 Olympics as a whole.
The stadium is the largest by seating capacity in Canada. After the Olympics, artificial turf was installed and it became the home of Montreal's professional baseball and football teams. The Alouettes of the CFL moved their regular season games to a smaller venue in 1998, but use Olympic Stadium for playoff and Grey Cup games. Following the 2004 baseball season, the Expos relocated to Washington, D.C., leaving the stadium without a main tenant, and with a history of financial and structural problems, it is largely seen as a white elephant. The stadium currently serves as a multipurpose facility for special events (e.g. concerts, trade shows) with a seating capacity of 65,255. The Impact of Major League Soccer (MLS) use the venue on occasion, when larger capacity is needed or when the weather restricts outdoor play in the spring months.