The Saint-Pierre River is a tributary of the Mascouche River, flowing in the sector of "Saint-Janvier", in the city of Mirabel, in the region administrative Laurentides, in the southwest of Quebec at Canada.

This river runs eastwards an agricultural plain skirting the northern village of "Saint-Janvier".

Saint Pierre river rises between the Highway 15 and route 117, the northwest side of the village of Saint-Janvier.

The place name "Rivière Saint-Pierre" is of Christian origin.

The place name "Saint-Pierre River" was formalized on August 8, 1977 at the "Banque de noms de lieux" (Bank of place names) of Commission de toponymie du Québec (Quebec Geographical Names Board).