Birkenes is a municipality in Aust-Agder county, Norway. It is located in the traditional district of Sørlandet. The village of Birkeland is the administrative center and about half of the municipality's residents live there. Birkeland is 30 kilometres (19 mi) from Kristiansand and 13 kilometres (8.1 mi) from Lillesand.

The municipality borders Kristiansand and Vennesla municipalities in Vest-Agder county and Iveland, Evje og Hornnes, Froland, Grimstad, and Lillesand municipalities in Aust-Adger.

The municipality (originally the parish) is named after the old Birkenes farm (Old Norse Birkines), since the first church was built there. The first element is birki which means "birch wood" and the last element is nes which means "headland".

The coat-of-arms is from modern times. They were granted on 5 December 1986. The arms are a canting of bjørk or birch. The green color symbolizes agriculture in the municipality. The three leaves symbolize the three villages in the municipality: Birkenes, Herefoss, and Vegusdal.

(See also coat-of-arms of Bjerkreim and Lavangen)

The historic parish of Tveit had to be divided into two formannskapsdistrikts on 1 January 1838 because the main part of Tveit belonged to the county of Vest-Agder and the annex of Birkenæs belonged to the county of Aust-Agder. On 1 January 1883, an uninhabited part of Birkenes was transferred to the control of neighboring Landvik municipality.

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