Bykle is a municipality in Agder county, Norway. It is located in the traditional district of Setesdal. The administrative centre of the municipality is the village of Bykle. Other villages in Bykle municipality include Berdalen, Bjåen, Breive, Hoslemo, Hovden, and Nordbygdi. Bykle was established as a municipality on 1 January 1902 when it was separated from the municipality of Valle.

Setesdal is a valley and a traditional district in Agder County in southern Norway. It consists of the municipalities of Bykle, Valle, Bygland, Iveland, and Evje og Hornnes.