Lolland Municipality is a kommune on the island of Lolland in the Region Sjælland of Denmark. According to Municipal And Regional Key Figures (www.noegletal.dk) it covers a total area of 885.40 km2 and has a population of 39,632. The western part of Guldborgsund Municipality, the southernmost in Denmark, occupies the eastern part of the island (Østlolland).

Lolland is the fourth largest island of Denmark, with an area of 1,243 km2 (480 sq mi). Located in the Kattegat, Belts and Sund area, it is part of Region Sjælland. As of 1 January 2022, it has 57,618 inhabitants. Lolland is closely connected to the island of Falster to its east. The locality of Sundby forms a cross-island urban area with Nykøbing Falster, the largest conurbation partially on Lolland. The most populated settlement on Lolland proper is Nakskov.