The Rivière Saumon Ouest (English: Salmon River West) is a tributary of the Saumon River, flowing only in the territory of the municipality of Notre-Dame-de-Bonsecours, in the Papineau Regional County Municipality, in the administrative region of Outaouais, in the province from Quebec, to Canada.

This small valley is mainly served by the Kenauk road (East–west direction), the Angèle Coast and the Azélie Coast.

[1] The West Salmon River originates from Sugar Bush Lake (length: 0.9 km (0.56 mi); altitude: 241 m (791 ft)) located in forest area.

The mouth of Sugar Bush Lake is located on the south side, at the bottom of a bay stretching over 0.25 km (0.16 mi).

The toponym "Rivière Saumon Ouest" was formalized on November 3, 1983, at the Place Names Bank of the Commission de toponymie du Québec.