Until 1 January 2007Ravnsborg was a municipality (Danish,kommune) on the northwest coast of the island ofLolland in the formerStorstrøm County in southDenmark. The municipality, including the islands ofFejø andFemø, covered an area of 198 km2, and had a total population of 5,569 (2005). Its last mayor was Stig Vestergård, a member of theSocial Democrats (Socialdemokraterne)political party. The main town and the site of its municipal council was the town ofHorslunde.
Ferry service connects the former municipality to Langeland from a harbour west of the town of Sandby, and to the islands of Fejø and Femø from the town of Kragenæs.
Ravnsborg municipality ceased to exist as the result ofKommunalreformen ("The Municipality Reform" of 2007). It was merged with existingHoleby,Højreby,Maribo,Nakskov,Rudbjerg andRødby municipalities to form the newLolland Municipality. This created a municipality with an area of 892 km2 and a total population of 49,469 (2005). The new municipality belongs toRegion Zealand ("Region Sjælland").