Nøtterøy is the largest island in Vestfold county, Norway. The 44-square-kilometre island is mostly located in Færder Municipality, but a small area on the far northern shore belongs to Tønsberg Municipality. The island is between the Ytre Oslofjord and the Tønsbergfjorden. Most of the northern part of the island is considered part of the city of Tønsberg metropolitan area which spans parts of Tønsberg and Færder municipalities.