Mitteldithmarschen is an Amt ("collective municipality") in the district of Dithmarschen, in Schleswig-Holstein, Germany. Its seat is in Meldorf. It was formed on 25 May 2008 from the former Ämter Kirchspielslandgemeinde Albersdorf, Kirchspielslandgemeinde Meldorf-Land and the town Meldorf.
The Amt Mitteldithmarschen consists of the following municipalities (with population in 2005):
Coordinates: 54°05′N 9°04′E / 54.083°N 9.067°E