Pertunmaa (Finnish: [ˈpertumˌmɑː]) is a municipality of Finland located in the Southern Savonia region. The municipality has a population of 1,541 (31 October 2024) and covers an area of 454.20 square kilometres (175.37 sq mi) of which 79.7 km2 (30.8 sq mi)
is water. The population density is 4.12 inhabitants per square kilometre (10.7/sq mi). The language of the municipality is Finnish.
Neighbour municipalities are Hartola, Heinola, Hirvensalmi, Mäntyharju and Joutsa. Pertunmaa became an independent municipality in 1926 when it was separated from Mäntyharju. Hartola's old wooden church was moved to Pertunmaa and it was inaugurated in 1927.
Due to the long-lasting economic difficulties, Pertunmaa will be incorporated into Mäntyharju on January 1, 2025.
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