The Décarie Interchange, sometimes known as Décarie Circle in English-language radio traffic reports,[2] is a highway interchange located on the island of Montreal, Quebec, Canada.

It is one of the busiest interchanges in Montreal as it connects Autoroute 40 (Metropolitan Boulevard; also Trans-Canada Highway) with Autoroute 15 south (Décarie Autoroute) and also provides access to Boulevard Marcel-Laurin (Route 117) and Décarie Boulevard in the borough of Saint-Laurent.

Slightly to the west of the interchange is another interchange, which is the eastern terminus of Autoroute 520 (Côte-de-Liesse Expressway); it merges into Autoroute 40 with a traffic circle and is sometimes considered part of the extended Décarie Interchange region.

It marks the western terminus of the Metropolitan Boulevard elevated expressway, which falls to ground level to the west.

Its most notable members include Daniel-Jérémie Décarie (1836-1904), who was mayor of Notre-Dame-de-Grâce from 1877 to 1904, and his son, lawyer Jérémie-Louis Décarie (1870-1927), who was a Quebec parliamentarian.