Borgundøya or Borgundøy is an island in Kvinnherad municipality in Vestland county, Norway. The 11.4-square-kilometre (4.4 sq mi) island lies in the Hardangerfjorden, immediately south of the island of Fjelbergøya. The island has about 79 residents (in 2017), with about four larger village areas spread out around the island. The island is dominated by the 462-metre (1,516 ft) tall mountain Borgundnuten.Borgundøya is only accessible by sea, either using ferries or personal boats. There are regular ferry routes from Leirvik-Borgundøya-Fjelbergøya-Halsnøy-Utbjoa, connecting several islands to the mainland in Vindafjord at Utbjoa.