Until 1 January 2007 Rudkøbing municipality was a municipality (Danish, kommune) in the former Funen County on the island of Langeland in south-central Denmark. The municipality included the islands of Strynø and Strynø Kalv, and covered an area of 63 km². It had a total population of 6,676 (2005). Its last mayor was Johan Norden, a member of the Social Democrats (Socialdemokraterne) political party. The main town and the site of its municipal council was the town of Rudkøbing. Part of the former municipality's southern border is defined by the Lindelse Cove (Lindelse Nor).