Ona is an island in Sandøy municipality in Møre og Romsdal county. The archipelago consists of two islands, Ona and Husøya. A small bridge connects the two islands. On the "Onakalven" stands a high lighthouse. The tower was built in 1867 and is 14.7 meters high. The lighthouse is a well-known tourist destination in Norway. Many tourists visit the island every year.