Hadseløya (Norwegian) or Ulbi (Northern Sami)[1] is an island in Hadsel Municipality in Nordland county, Norway.

The town of Stokmarknes is situated on the northern shore of the island and the village of Melbu is on the southern coast.

The island has an area of 102 square kilometres (39 sq mi).

The 657-metre (2,156 ft) tall mountain Lamlitinden is the highest point on the island.

Hadseløya is connected to the neighboring islands of Langøya and Børøya by the Hadsel Bridge.