Meersburg is a town in the southwestern German state of Baden-Württemberg. On the shore of Lake Constance (Bodensee), it's surrounded by vineyards. Medieval Meersburg Castle houses the Fortress Museum, showing a medieval living room and castle dungeon. Nearby, New Palace has baroque architecture and frescoes. Above town, the Droste Museum displays poet Annette von Droste-Hülshoff's personal writings and belongings.

The name of the town means "Castle on the Sea", referring to a castle which, according to a tradition from 1548, was built here in 630 by the Merovingian king Dagobert I.

The commune obtained the status of free city in 1299, though nominally still under the Bishop of Constance. In 1803 it was annexed to the Electorate of Baden.

After World War II, Meersburg was in the French military occupation area in Germany.

The town is home to two castles, the Old Castle and the New Castle. The Old Castle, built by Merovingian King Dagobert I in the seventh century, is one of the oldest surviving castles in Germany. It is in private ownership. A self-guided tour is available. German poet Annette von Droste-Hülshoff lived there for eight years and purchased the Prince's House. The New Castle was built in the eighteenth century. Originally the residence of the bishop of Constance, it was used for various purposes after the Secularization of 1803. It is now a museum. There is also an expanse of half-timbered houses, and two medieval town gates, which are the remains of the fortification.