Surnadal is a municipality in Møre og Romsdal county, Norway. It is part of the Nordmøre region. The administrative centre is the village of Skei. Other villages include Todalsøra, Surnadalsøra, Sylte, Glærem, Stangvik, and Åsskard.
Surnadal was established as a municipality on 1 January 1838 . In 1858, the eastern district of Rindal was separated from Surnadal to form a separate municipality. This left Surnadal with 3,105 residents. On 1 January 1877, part of Stangvik (population: 50) was transferred to Surnadal. In 1879, part of Surnadal (population: 83) was transferred to Stangvik. On 1 January 1886, the Møklegjerdet farm (population: 29), just west of Glærem, was transferred from Stangvik to Surnadal. On 1 January 1897, the Sjøflot farm (population: 27) was also transferred from Stangvik to Surnadal. On 1 January 1965, Åsskard and most of Stangvik were merged into Surnadal. The newly enlarged municipality had a population of 5,934.