Audnedal is a municipality in Vest-Agder county, Norway. It is located in the traditional district of Sørlandet. The administrative centre of the municipality is the village of Konsmo. Other villages in Audnedal include Byremo and Vivlemo. The municipality encompasses the upper half of the Audnedalen valley, and the municipality of Lindesnes (to the south) covers the southern half of the valley.

The municipality is served by the Audnedal Station along the Sørlandet Line. The railway station is near Konsmo. The railroad heads west from Audnedal and goes through the Hægebostad Tunnel, one of the longest railroad tunnels in Norway.

The old municipality of Undal was established in 1 January 1838 (see formannskapsdistrikt). That municipality only existed until 1845 when it was split into Nord-Audnedal and Sør-Audnedal. Those municipalities were later divided also. Sør-Audnedal was divided into Spangereid in 1899 and Nord-Audnedal was divided into Konsmo and Vigmostad in 1911. During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. This is when the present-day municipality of Audnedal was created. Audnedal was established as a municipality on 1 January 1964 when the municipality of Konsmo (population: 712), the municipality of Grindheim (population: 701), and the Ågedal and Midtbø areas (population: 96) of Bjelland municipality were merged together. This new Audnedal municipality mostly corresponded to the historical borders of the old municipality of Nord-Audnedal.

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