Rudkøbing is a town in Denmark, on the western coast of the island of Langeland. It is the seat of Langeland Municipality, in the Southern Denmark Region. The town is located 15 kilometres (9.3 mi) southeast of Svendborg and is connected to Siø through the Siøsund Bridge.

Langeland Municipality is a kommune in the Region of Southern Denmark, located entirely on the island of Langeland and a number of smaller surrounding islands. The municipality covers an area of 290.30 km2, and has a total population of 12,384 (2023). Being an island, it doesn't have any land borders with any other municipality, though it connects to Svendborg Municipality through the Siøsund Bridge. There are connections by ferry to Ærø Municipality and Lolland Municipality. Its mayor is Tonni Hansen, a member of the Socialist People's Party. The main town and the site of its municipal council is the city of Rudkøbing.