Sør-Arnøya[1] is a small island in Gildeskål Municipality in Nordland county, Norway.

The 4-square-kilometre (1.5 sq mi) island is located west of the neighboring island of Sandhornøya and south of the island of Nord-Arnøya.

Sør-Arnøya and Nord-Arnøya are linked with a 100-metre (330 ft) long bridge.

The closest town to Sør-Arnøya is Bodø, to the north, which can be reached by boat.

This article about an island in Nordland is a stub.