Rødbyhavn (Danish pronunciation: [ʁœðpyˈhɑwˀn]) is a small town and harbour on the south coast of Lolland, Denmark, with a population of 1,516 (1 January 2024).

Thus one can drive or take the train from Copenhagen over the Fehmarn Belt, and on to Lübeck and Hamburg by European route E47, which in Germany is known as autobahn A1 or Vogelfluglinie.

The dyke had been constructed in 1872 following storm floods, and on its outer side, at Syltholm, a harbour for fishing and commerce was opened in 1912.

1916 saw the construction of a first shipyard, but by the 1920s, the shipbuilding business at Rødbyhavn ran into bankruptcy, and activity in the harbour stagnated.

In 1941, work began to prepare for the expansion of the harbour in order to support a ferry connection between Rødbyhavn and Puttgarden.