Radøy is an island in Vestland county, Norway.

The island has an area of 110.7 square kilometres (42.7 sq mi).

The highest point of the island is the 217-metre (712 ft) tall Morkefjellet.

The island had a population of 5,280 inhabitants in 2001, with the largest urban areas being the village of Manger on the west-central coast and the village of Bøvågen on the northern coast.

Radøy is connected to the mainland via the Alversund Bridge on the southern tip of the island.