Helgøy is a former municipality in Troms county, Norway. The 659-square-kilometre (254 sq mi) island municipality existed from 1886 until its dissolution in 1964. It was located in the western part of the present-day Karlsøy Municipality. The municipality included the islands of Helgøya, , and Nordkvaløya, large parts of the nearby islands of Rebbenesøya, Ringvassøya, Vannøya, and many smaller surrounding islands. The administrative centre was located on the south side of the island of Helgøya in a small village where Helgøy Church is also located.