Farsund 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 Farsund. Farsund is a coastal municipality in the far southwestern part of Norway, bordering Kvinesdal municipality in the north and Lyngdal in the north and east.

The 263-square-kilometre (102 sq mi) municipality is the 276th largest by area out of the 356 municipalities in Norway. Farsund is the 115th most populous municipality in Norway with a population of 9,691. The municipality's population density is 38.5 inhabitants per square kilometre (100/sq mi) and its population has increased by 3% over the previous 10-year period. The inhabitants of Farsund are concentrated in three centres of population: the town of Farsund (population: 3,265), Vanse (population: 2,016), and Vestbygda (population: 1,123). Loshavn with its wooden buildings is located outside the town of Farsund. Other villages in Farsund include Ore, Rødland, and Sande.