The Pierre River is a tributary of the Mitchinamecus River which is a tributary of the rivière du Lièvre, flowing in the unorganized territory of Baie-Obaoca, in the Matawinie Regional County Municipality, in the administrative region of Lanaudière, in the province of Quebec, in Canada.

From the middle of 19th century, forestry was the dominant economic activity in the sector; recreational tourism, second.

The lower part of this small valley is served by the Chemin de Parent.

Safe circulation on the ice is generally done from the end of December to the beginning of March.

[1] The toponym "Rivière Pierre" was formalized on January 24, 1992 at the Place Names Bank of the Commission de toponymie du Québec.