Rødby is a town located on the island of Lolland in south Denmark.

The former Rødby municipality covered an area of 120 km2, and had a total population of 6,590 (2005).

It was merged with the existing Holeby, Højreby, Maribo, Nakskov, Ravnsborg, and Rudbjerg municipalities to form the new Lolland Municipality.

This creates a municipality with an area of 892 km2 and a total resident population of 49,469 (2005).

Rødbyhavn is a ferry port and is the endpoint of the Danish section of the European route E47.