Årøya (Norwegian) or Ladnesuolu (Northern Sami)[1] is an island in Alta Municipality in Finnmark county, Norway.

The 6.38-square-kilometre (2.46 sq mi) island is located in the Altafjorden, about 22 kilometres (14 mi) north of the town of Alta.

There is a regular ferry connection between the village of Kongshus on Årøya and Mikkelsby on the mainland, just northwest of the village of Leirbotn.

The island is the site of the remains of the old Altenhus Fortress in the village of Kongshus.

This article about a location in Finnmark is a stub.