Nord-Frøya is a former municipality in the old Sør-Trøndelag county, Norway. The 139-square-kilometre (54 sq mi) municipality existed from 1906 until its dissolution in 1964. Nord-Frøya included the northern part of the island of Frøya and all of the small islands to the north and northeast such as Sula, Mausund, Froan, and Halten in what is now the municipality of Frøya in Trøndelag county. The main church for the municipality was Sletta Church (or Nord-Frøya Church) which is located at Svellingen (the administrative centre of the municipality) on the northern coast of the island.