The Bras du Nord-Ouest is a tributary of the west bank of the lower part of the rivière du Gouffre, flowing entirely in the city of Baie-Saint-Paul, in the Charlevoix Regional County Municipality, in the administrative region of Capitale-Nationale, in the province of Quebec, in Canada.

The water level of the river varies with the seasons and the precipitation; the spring flood generally occurs in April.

The North-West Arm rises at the mouth of La Flippe Lake (length: 1.4 kilometres (0.87 mi); altitude: 684 metres (2,244 ft)).

The mouth of this lake is located at: From its source, the course of the North-West Arm descends on 27.7 kilometres (17.2 mi) more or less parallel to the shore of the St. Lawrence River, with a drop of 674 metres (2,211 ft), according to the following segments: The North West Arm flows into a river loop on the west bank of the Rivière du Gouffre, in the town of Baie-Saint-Paul.

In French Canadian toponymy, particularly in the Charlevoix region, the term "arm" is frequently used in place of the generic "river".