The Petite rivière de la Loutre is a watercourse flowing into Gulf of St. Lawrence, flowing in the eastern part of the municipality of L'Île-d'Anticosti, in the Minganie Regional County Municipality, in the administrative region of Côte-Nord, in the province of Quebec, in Canada.

The course of this river delimits the eastern part of the territory of SÉPAQ Anticosti and the logging zone; the two sections of SÉPAQ Anticosti territory are separated by 82.9 km (51.5 mi).

The Petite rivière de la Loutre draws its source from a very small lake (altitude: 72 m (236 ft)) located in the eastern part of Anticosti Island.

This source is located on the southeast side of Lac au Renard (head water body of Rivière au Renard), either at: From its source, the Petite rivière de la Loutre flows on 13.3 km (8.3 mi) towards the south with a drop of 71 m (233 ft), until its mouth where the current bypasses a small Isle.

[1] The Petite rivière de la Loutre flows on the south shore of Anticosti Island, that is 25.3 km (15.7 mi) to the south-west of the Pointe de l'Est of the island, and at 177.3 km (110.2 mi) east of the village center of Port-Menier.