Røyrvik (Norwegian) or Raarvihke (Southern Sami) is a municipality in Trøndelag county, Norway. It is part of the Namdalen region. The administrative centre of the municipality is the village of Røyrvik. The area has always had a strong Sami influence. The village lays relatively close to the border with Sweden and the municipal boundary eastwards forms part of the international border.

Southern or South Sámi is the southwesternmost of the Sámi languages, and is spoken in Norway and Sweden. It is an endangered language; the strongholds of this language are the municipalities of Snåsa, Røyrvik, Røros and Hattfjelldal in Norway. Of the approximately 2000 Southern Sami, only about 500 still speak fluent Southern Sami. This language belongs to the Saamic group within the Uralic language family.