Eiken is a village in Hægebostad Municipality in Agder county, Norway. The village is located on the northern shore of the lake Lygne, about north of the municipal centre of Tingvatn and about north of the village of Skeie. The village sits near the northern end of the Lyngdalen valley, about southeast of the village of Haddeland.
There is some industry and agriculture as well as a good amount of tourism. The Sørlandets Rehabiliteringssenter Eiken () is located in Eiken and run by the Southern and Eastern Norway Regional Health Authority. The village is also the site of Eiken Church which serves the northern part of the municipality.
History From 1916 until 1963, the village was the administrative centre of the old Eiken Municipality.
Name The village (originally the parish) is named after the old Eiken farm (). The name of the farm the definite form of the Norwegian word which means "oak tree".
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