Årøya

or is an island in Alta Municipality in Finnmark county, Norway. The 6.38 km2 island is located in the Altafjorden, about 22 km north of the town of Alta. The island is only accessible by boat. 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. The old fortress was built in 1610.