Lapinlahti is a municipality of Finland. It is part of the Northern Savonia region, located 59 kilometres north of the city of Kuopio. The municipality has a population of 8,869 and covers an area of 1,245.16 square kilometres of which 148.58 km2 is water. The population density is 8.09 inhabitants per square kilometre. The municipality is unilingually Finnish. The neighboring municipalities of Lapinlahti are Iisalmi, Kuopio, Rautavaara, Siilinjärvi and Sonkajärvi.