Krempermarsch or Kremper Marsch is an Amt ("collective municipality") in the county of Steinburg, in Schleswig-Holstein, Germany. It is situated between Itzehoe and Glückstadt. The seat of the Amt is in the town Krempe.

The Amt Krempermarsch consists of the following municipalities (population in 2005 between brackets):

• Bahrenfleth (606)
• Dägeling (1,016)
• Elskop (157)
• Grevenkop /348)
• Krempe (2,447)
• Kremperheide (2,547)
• Krempermoor (530)
• Neuenbrook (688)
• Rethwisch (618)
• Süderau (792)

53°49′N 9°28′E / 53.817°N 9.467°E / 53.817; 9.467