The Rivière des Prairies (literally River of the Prairies, sometimes called the The Back River in English) is a delta channel of the Ottawa River in southwestern Quebec, Canada. The Amerindians who originally inhabited the Island of Montreal called it Skowanoti, meaning "River behind the island".

Rivière-des-Prairies was a municipality that was annexed by Montreal, Canada in 1963. On January 1, 2002 it became part of the borough of Rivière-des-Prairies–Pointe-aux-Trembles–Montréal-Est. On January 1, 2006 Montreal East demerged, and the borough became Rivière-des-Prairies–Pointe-aux-Trembles. The borough is known for its high concentration of Italians in most of the neighborhoods, and Haitians in the others. On July 9, 2006, after Italy won the 2006 FIFA World Cup, Maurice Duplessis Boulevard was closed to traffic due to the great number of fans celebrating in the street.