The Cloutier river (in French: rivière Cloutier) flows in the municipalities of Sainte-Apolline-de-Patton, Notre-Dame-du-Rosaire, Cap-Saint-Ignace, in the Montmagny Regional County Municipality, in the administrative region of Chaudière-Appalaches, in Quebec, in Canada.

Several branches of mountain and forest streams feed the head of the Cloutier river.

[1] From its source, the Cloutier river flows over 16.9 kilometres (10.5 mi), with a drop of 95 metres (312 ft), divided into the following segments: The Cloutier river flows on the southwest bank of the Bras Saint-Nicolas.

This confluence is located upstream of the "Great lock" and downstream of the mouth of the Méchant Pouce River.

[1] The toponym Rivière Cloutier was formalized on December 5, 1968, at the Commission de toponymie du Québec.