The rivière à la Loutre is a water course flowing into Gulf of Saint Lawrence, flowing in the municipality of L'Île-d'Anticosti, in the regional county municipality (MRC) of Minganie Regional County Municipality, in the administrative region of Côte-Nord, in province of Quebec, in Canada.

Forest roads serve the valley of this river.

[1] The Rivière à la Loutre draws its source from Lac long (length: 34 km (21 mi); altitude: 3.5 m (11 ft)) located in the center-west of Anticosti Island.

This source is located at: From the mouth of Long Lake, the Rivière à la Loutre flows over 29.6 km (18.4 mi) with a drop of , according to the following segments: Rivière à la Loutre flows onto the south shore of Anticosti Island, i.e. 6.1 km (3.8 mi) from the western limit of SÉPAQ Anticosti and 39.2 km (24.4 mi) east of the village center of Port-Menier.

[1] The toponym "rivière à la Loutre" was made official on December 5, 1968, at the Place Names Bank of the Commission de toponymie du Québec.