Sørfugløya or Sør-Fugløy is a small (97 ha) uninhabited island and nature reserve in Karlsøy Municipality, Troms county, in Arctic northern Norway.
It lies just north-west of the larger inhabited island of Rebbenesøya.
It is a steep island with grassy slopes surrounded by boulder scree.
It, with its adjacent marine waters, has been designated a 760 ha Important Bird Area (IBA) by BirdLife International because it supports large breeding colonies of Atlantic puffins and razorbills.
European storm petrels also breed on the island.