Bykle is a municipality in Aust-Agder county, Norway. It is located in the traditional region of Setesdal. The administrative center is the village of Bykle in the southern part of the municipality. Another village nearby is Nordbygdi. Bykle was established when it was separated from the municipality of Valle on 1 January 1902.

The municipality of Bykle was created when it was separated from the older municipality of Valle on 1 January 1902 after a dispute over the costs of road building (Bykle was the bigger area, while Valle had more people and more money). At that time, Bykle had a population of 476 residents in the new municipality.

The municipality (originally the parish) is named after the old Bykle farm (Old Norse: Byklar), since the first church was built there. The farm is named after Lake Bykil, but the meaning of that name is unknown.

The coat-of-arms is from modern times. They were granted on 4 April 1986. The arms show 11 silver water droplets as a symbol for the water and rivers in the municipality, as well as for the hydropower plant which was founded in 1915. The plant has brought prosperity to the area since then. The green color of the background symbolizes agriculture.

Bykle is bordered in the north by Vinje municipality, in the east by Tokke both in Telemark county. It is bordered in the south by Valle in Aust-Agder county and also bordered by Sirdal in Vest-Agder county. It is bordered in the southwest by Forsand and in the west by Hjelmeland and Suldal--all in Rogaland county.

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