Greenfield Park is a Arrondissement of the Québécois city of Longueuil, located on southern bank of Montreal. Formerly a city with whole share, it was attached to Longueuil on January 1st 2002 at the time of the municipal fusions.

In 2001, the city counted 16,978 individuals, divided between French-speaking people (49%), english-speaking (37%) and allophones (14%). Its surface was of 4,78 km ².

The district of Greenfield Park is in the federal district of Saint-Lambert and in the provincial district of Laporte.