Ytre Storevatnet is a lake in the municipality of Bykle in Agder county, Norway. The 2.8-square-kilometre (1.1 sq mi) lake makes up the northernmost part of the Svartevatnet reservoir that empties into the Sira River system. The lake is located just south of the lake Blåsjø and southwest of Botsvatn. The village of Bykle is about 25 kilometres (16 mi) northeast of the lake.

• List of lakes in Aust-Agder