Mutsu Bay (陸奥湾 Mutsu-wan?) is a bay inside Aomori Prefecture, Japan. It includes three bays; Aomori Bay, Noheji Bay and Ōminato Bay. Mutsu Bay covers about 1660 km². The culture of scallops is prosperous in the bay.
Coordinates: 40°59′N 140°58′E / 40.983°N 140.967°E