L'Anse Saint-Jean (English: Saint-Jean Bay) is a bay located on the south shore of the Saguenay River at L'Anse-Saint-Jean, in the Le Fjord-du-Saguenay Regional County Municipality, in Quebec, Canada.

[1] Perpendicular to the Saguenay River, this cove is 2.3 km (1.4 mi) wide by 2.8 km (1.7 mi) long.

The Saint-Jean River flows into the end of the bay.

[2] The entrance to this bay is bounded by "Pointe au Boeuf" (located to the west) and "la Grande Pointe" (located to the east).

[3] Located between Anse du Petit Saguenay (east side) and Baie Éternité (west side), Anse Saint-Jean is a haven for pleasure boating in the event of large waves.