is a municipality in Agder county, Norway. It is located in the traditional district of Lister. The administrative centre of the municipality is the town of Alleen. Some of the main villages in Lyngdal include Austad, Byremo, Fleseland, Hæåk, Konsmo, Korshamn, Kvås, Skomrak, Svenevik, and Vivlemo. The municipal economy centers around wood processing, agriculture, and commerce.