Eiderstedt (German: Eiderstedt; Danish: Ejdersted; North Frisian: Ääderstää) is an Amt ("collective municipality") in the district of Nordfriesland, in Schleswig-Holstein, Germany.

The Amt covers the peninsula of Eiderstedt, excepted for the town of Tönning.

On January 1, 2008, the independent municipality of Sankt Peter-Ording became part of the Amt.

The Amt Eiderstedt consists of the following municipalities (population in 2005 between brackets): The coat of arms displays a golden ship on a blue background with 3 sails in which are drawn, in red, a leopard, a cow and a fish.

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