Saint-Polycarpe (French pronunciation: [sɛ̃ pɔlikaʁp] ⓘ) is a municipality located in the Vaudreuil-Soulanges Regional County Municipality in the Montérégie region west of Montreal, Quebec, Canada, and just east of the Quebec-Ontario border.

While a parish during the 18th century, its territory included portions of what is now part of Saint-Zotique.

Settlement began around 1800 when a sawmill and a flour mill were built at the rapids of the Delisle river.

In 1818, a chapel was built there and in 1830, the parish was established, called Saint-Polycarpe de la Nouvelle-Longueuil.

[1] On December 31, 1988, the parish and village merged again to form the Municipality of Saint-Polycarpe.