Rautalampi (literally means "iron pond") is a municipality of Finland. It is located in the Northern Savonia region. The municipality has a population of 3,097 (31 July 2020) and covers an area of 761.98 square kilometres (294.20 sq mi) of which 222.99 km2 (86.10 sq mi) is water. The population density is 5.75 inhabitants per square kilometre (14.9/sq mi). The municipality is unilingually Finnish.