Until 1 January 2007 Rudbjerg was a municipality (Danish, kommune) on the southwest coast of the island of Lolland in the former Storstrøm County, southern Denmark.
The municipality covered an area of 143 km², and had a total population of 3,432 (2005).
The main town and the site of its municipal council was Dannemare.
It was merged with existing Holeby, Højreby, Maribo, Nakskov, Ravnsborg, and Rødby municipalities to form the new Lolland municipality.
This created a municipality with an area of 892 km² and a total population of 49,469 (2005).