Lemi is a municipality of Finland. It is located in the South Karelia region. The municipality has a population of 2,854 (31 August 2024), which make it the smallest municipality in South Karelia in terms of population. It covers an area of 262.48 square kilometres (101.34 sq mi) of which 44.71 km2 (17.26 sq mi) is water. The population density is 13.09 inhabitants per square kilometre (33.9/sq mi).
The municipality is unilingually Finnish. The Finnish thrash metal band Stam1na is from Lemi.
In 2018 Lemi won the title "heavy metal capital of the world," a title that was determined by number of bands per capita.
Lemi had 13 recognised bands. Due to Lemi only having just 3,076 inhabitants at the time, it won with a ratio of 422.6 bands per 100,000 inhabitants.