Vanna (also called Vannøya) is a rocky island in Karlsøy municipality, Troms county, Norway. Its area is 232 square kilometres (90 sq mi). The highest peak is Vanntinden at a height of 1,031 metres (3,383 ft) above sea level. The population of the island (2001) is 973. Vanna is the 17th largest island in Norway by area. Vannvåg and Vannareid are the two main urban areas on the island.
The islands of Nord-Kvaløya and Helgøya lie to the west of the island, and Fugløya and Arnøya lie to the east of it. Karlsøya, Reinøya, and Ringvassøya are located to the south of the island. There is ferry service to Karlsøya and Ringvassøya departing from the village of Skanningen on the southern tip of Vanna.