The El Mocambo is a live music and entertainment venue in Toronto, Ontario, Canada. Located on Spadina Avenue, just south of College Street, the bar has played an important role in the development of popular music in Toronto since the 1940s. It is best known for the 1977 surprise show by The Rolling Stones, which became nationally notorious for the presence of then Prime Minister Pierre Trudeau's wife, Margaret Trudeau (then Margaret Kemper), who was partying with the Stones.