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 which is located at Svellingen on the northern coast of the island.

Frøya is the westernmost municipality in Trøndelag county, Norway. It is part of the Fosen region and consists of the island of Frøya, which lies north of the island of Hitra, as well several thousand other small islands surrounding the island of Frøya. The village of Sistranda is the administrative center of Frøya. Other villages include Hammarvika, Titran, Sula, and Mausund. The main island of Frøya is connected to the neighboring island of Hitra by the Frøya Tunnel which goes under the Frøyfjorden.