Viitasaari is a Finnish town and municipality located in the Central Finland region. It is located between the neighbouring municipalities of Pihtipudas to the north and Äänekoski to the south. The town has a population of 5,757
(31 October 2024) and covers an area of 1,589.13 square kilometres (613.57 sq mi) of which 340.43 km2 (131.44 sq mi), or 21%, is water. There are all together 230 lakes in Viitasaari. The biggest lakes are Lake Keitele, Lake Kolima and Muuruejärvi. The population density is
4.61 inhabitants per square kilometre (11.9/sq mi).
The municipality is unilingually Finnish.