The Bras de Ross (English: Ross's Arm) is a tributary of Brébeuf Lake, flowing in the municipality of Ferland-et-Boilleau and Rivière-Éternité, in the Le Fjord-du-Saguenay Regional County Municipality, in the administrative region of Saguenay–Lac-Saint-Jean, in the province of Quebec, in Canada.

The lower part of the Ross Valley is integrated into the zec du Lac-Bébeuf.

The surface of "Bras de Ross" is usually frozen from the beginning of December to the end of March, however the safe circulation on the ice is generally done from mid-December to mid-March.

The main watersheds adjacent to "Bras de Ross" are: The "Bras de Ross" rises at the mouth of Lac du Berger (length: 1.4 km (0.87 mi); altitude: 438 m (1,437 ft)) in a valley between the mountains.

The mouth of "Lac du Berger" is located at: From the mouth of "Lac du Berger", the course of "Bras de Ross" descends on 21.6 km (13.4 mi), according to a drop of 199 m (653 ft) according to the following segments: Upper course of "Bras de Ross" (segment of 10.4 km (6.5 mi)) Lower course of "Bras de Ross" (segment of 11.2 km (7.0 mi)) The "Bras de Ross" pours into the bottom of a bay on the southwest shore of the western part of Brébeuf Lake.