Hasseløy is an island in Haugesund municipality in Rogaland county, Norway.

[1] The offices for the western region of the Norwegian Coastal Administration are in the southwest corner of the island.

[2] The small Dokken museum with historical boats and buildings is located on the east side, near the bridge.

[3] Historically, the island was the site of industries including the shipyard Hauges Jernskibsbyggeri from 1907.

[5] Hanna Brummenæs (1860-1942), pioneering female shipping company owner