Erfjord is a former municipality in Rogaland county, Norway. The 132-square-kilometre (51 sq mi) municipality existed from 1914 until 1965. It encompassed the area around the Erfjorden in the southwestern part of the present-day municipality of Suldal. The administrative centre of the municipality was the village of Hålandsosen, where the Erfjord Church is located.

Suldal is a municipality in the northeast corner of Rogaland county, Norway. It is located in the traditional district of Ryfylke. Since 1965, the administrative centre of Suldal is the village of Sand i Ryfylke. Other villages in Suldal include Haugsland, Jelsa, Marvik, Nesflaten, and Suldalsosen.