The L'Abbé river is a tributary of the east bank of the Métabetchouane River, flowing in the municipalities of Saint-André-du-Lac-Saint-Jean and Chambord, in the Le Domaine-du-Roy Regional County Municipality, in the administrative region of Saguenay–Lac-Saint-Jean, in the province of Quebec, in Canada.

From its source, the course of the L'Abbé river descends on 6.4 km (4.0 mi), with a drop in level of 61 m (200 ft).

Then, it flows over a length of 5.7 km (3.5 mi) towards the northwest, to its mouth, located on the east bank of the Métabetchouane River in the middle of a rapid zone, facing an island and 0.4 km (0.25 mi) upstream of the mouth of the Grande Désir river.

[1] From the confluence of the L'Abbé river, the current descends the Métabetchouane River to the north on 8.9 km (5.5 mi) crossing Martine Falls, to the south shore of Lac Saint-Jean; from there, the current crosses the latter on 22.8 km (14.2 mi) towards the northeast, then borrows the course of the Saguenay River via la Petite Décharge on 172.3 km (107.1 mi) until Tadoussac where it merges with the Saint Lawrence estuary.

[1] The toponym Rivière L'Abbé was formalized on December 5, 1968, at the Place Names Bank of the Commission de toponymie du Québec.