The Sableuse River is a watercourse in the Matapedia Valley, in administrative region of Bas-Saint-Laurent, in Quebec, Canada.

This river flows into the regional county municipalities (RCM): This course river of the Matapedia Valley is descending towards the Southwest; it passes through the territory of Sainte-Paule and Matapedia Lake (at the Eastern boundary of the territory of Sayabec).

Its source, the Sableuse ponds, lie at 2.6 kilometres (1.6 mi) Northwest of the village of Saint-Vianney.

Its outflow occurs in the Sableuse River Bay in Matapedia Lake, right in front of the Matane Island.

This confluence is located at 2.2 kilometres (1.4 mi) from the mouth of Matapedia Lake.