Ähtäri (Swedish: Etseri) is a town and municipality of Finland. It is located in the South Ostrobothnia region. The town has a population of 5,485 (31 December 2021) and covers an area of 910.87 square kilometres (351.69 sq mi) of which 105 km2 (41 sq mi) is water. The population density is 6.81 inhabitants per square kilometre (17.6/sq mi). Ähtäri is located 83 kilometres (52 mi) southeast of Seinäjoki. The municipality is unilingual Finnish. The largest private sector employers are Inhan Tehtaat, Silver-Veneet, Tankki, and Muovilami.