Hellesøy or Hedlesøy is an island in Stavanger municipality in Rogaland county, Norway. The 0.41-square-kilometre (100-acre) island lies in an archipelago at the mouths of the Gandsfjorden and Høgsfjorden, about 4.5 kilometres (2.8 mi) east of the centre of the city of Stavanger. The island lies close between the islands of Lindøy and Kalvøy and together, the three islands form a "neighborhood" within the city of Stavanger. In 2016, the three islands had a total combined population of 26. The island is only accessible by boat.

• List of islands of Norway

• Map of Hellesøy