The ruisseau L'Abbé (English: L'Abbé stream) is a freshwater tributary of the Pikauba River, flowing in the unorganized territory of Lac-Ministuk, in the Le Fjord-du-Saguenay Regional County Municipality, in the administrative region of Saguenay–Lac-Saint-Jean, in province, in Quebec, to Canada.

The upper part of the ruisseau L’Abbé valley is accessible by route 169; other secondary forest roads have been developed in the sector for forestry and recreational tourism activities.

The northern mouth of this head lake is located at: From the small head lake, the course of the ruisseau L’Abbé flows over 19.3 km (12.0 mi) entirely in the forest zone, with a drop of 99 km (62 mi), according to the following segments: Upper stream of ruisseau L’Abbé (segment of 9.2 km (5.7 mi)) Lower stream of ruisseau L’Abbé (segment of 10.1 km (6.3 mi)) L’Abbé stream flows into a bend on the west bank of the Pikauba River.

This confluence is located at: From the confluence of L'Abbé stream with the Pikauba River, the current successively descends the Pikauba River on 8.4 km (5.2 mi) to the northeast, then the current crosses Kenogami Lake on 17.6 km (10.9 mi) north-east to the dam of Portage-des-Roches, then follow the course of the Chicoutimi river on 26.2 km (16.3 mi) towards the east, then the northeast, and the course of the Saguenay River on 114.6 km (71.2 mi) towards the east until Tadoussac where it merges with the Saint Lawrence estuary.

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