Berdalen is a village in Bykle municipality in Agder county, Norway. The village is located in the Setesdalen valley, along the river Otra and the Norwegian National Road 9. It is about 12 kilometres (7.5 mi) north of the village of Bykle and the same distance south of the village of Hovden. The small village of Hoslemo and the lake Vatndalsvatnet both lie about 3 kilometres (1.9 mi) to the west of the village. Berdalen has several large mountains located about 10 kilometres (6.2 mi) to the east along the municipal border. The mountains include Gråsteinsnosi, Brandsnutene, Svolhusgreini, Sæbyggjenuten, and Støylsdalsnutene.