Lyngdal is a municipality in Vest-Agder county, Norway. Lyngdal was established as a municipality on 1 January 1838 (see formannskapsdistrikt). Austad and Kvås were separated from Lyngdal on 1 January 1909 but they were again merged with Lyngdal on 1 January 1964, together with the area of Spangereid west of Lenesfjorden.