Reinøya is an island located in Karlsøy municipality in Troms county. Until 1. January 2008 was the southern part of the island a part of the Tromsø municipality.  Reinøya has four villages, where the majority of the population lives, the North As, Finkroken, grote Valley and Stakkvik. The latter is regarded as the island's hovedsenter. The island is located east of Ringvassøy and has an area of 147 km ² and 300 inhabitants (2008) Reinøya The name comes from the word or Rein Reina; "island mountain edges."