Lemland is a municipality of Åland, an autonomous territory of Finland.
The municipality has a population of 2,140 (31 August 2024) and covers an area of 965.30 square kilometres (372.70 sq mi) of which 852.23 km2 (329.05 sq mi) is water. The population density is 18.9 inhabitants per square kilometre (49/sq mi).
The municipality is unilingually Swedish.
The Lemström channel divides Lemland from its neighboring municipality, Jomala. It was widened by Russian POWs in 1882.