Geest und Marsch Südholstein (before 1 January 2017: Moorrege) is an Amt ("collective municipality") in the district of Pinneberg, in Schleswig-Holstein, Germany. The seat of the Amt is in Moorrege.
The Amt Geest und Marsch Südholstein consists of the following municipalities:
Coordinates: 53°40′01″N 9°40′01″E / 53.667°N 9.667°E