The Normandin River is a tributary of the north shore of Ashuapmushuan Lake, flowing into the unorganized territory of Lac-Ashuapmushuan, Quebec, into the Regional County Municipality (RCM) of Le Domaine-du-Roy, in the administrative region of Saguenay-Lac-Saint-Jean, in Quebec, in Canada.

This river crosses successively the cantons of Ventadour, Buade, Poutrincourt, Bouteroue, Ducharme, Aigremont and Grahamé.

The surface of the Normandin River is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.

The mouth of this lake is located in Ashuapmushuan Wildlife Reserve at 5.1 kilometres (3.2 mi) west of the Eeyou Istchee James Bay (municipality) boundary and the Regional County Municipality (RCM) Le Domaine-du-Roy.

The toponym "Normandin River" was formalized on December 5, 1968, at the Commission de toponymie du Québec, when it was created.