The River Pahunan is a tributary of the Kitchigama River, in the administrative region of Nord-du-Québec, in the Canadian province of Quebec.

The course of this river flows in the townships of Grasset, the Forest and Paramé.

This hydrographic slope does have a winter roads going northward.

The main neighboring hydrographic slopes are: The Pahunan River originates from a small unidentified lake (elevation: 259 metres (850 ft)) located at: From its source in the township of Grasset, the river Pahunan flows on 48.5 kilometres (30.1 mi) according to the following segments: The Pahunan River flows into a river bend on the South shore of the Kitchigama River.

This confluence is located at: The toponym "Pahunan River" was made official on December 5, 1968, at the Commission de toponymie du Québec, i.e. at the creation of this commission.