Meldorf (Holsatian: Meldörp or Möldörp) is a town in western Schleswig-Holstein, Germany, that straddles the river Miele in the district of Dithmarschen.

In 1265 it received its municipal rights and served as the capital of Dithmarschen, a peasant republic with Allies in the Hanseatic league dating from 1468.

The city was sacked in 1500 AD when King John of the Kalmar Union attempted to conquer the republic.

After a district reform Süderdithmarschen and Norderdithmarschen merged to Dithmarschen and Meldorf lost the capitalship to the town of Heide.

Meldorf is the seat of the collective municipality Amt Mitteldithmarschen.