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):

1. Garding (2,664) [town]
2. Garding, Kirchspiel (344)
3. Grothusenkoog (20)
4. Katharinenheerd (173)
5. Kotzenbüll (236)
6. Norderfriedrichskoog (44)
7. Oldenswort (1,282)
8. Osterhever (246)
9. Poppenbüll (179)
10. Sankt Peter-Ording (4,177)
11. Tating (990)
12. Tetenbüll (610)
13. Tümlauer-Koog (100)
14. Vollerwiek (224)
15. Welt (214)
16. Westerhever (129)

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.^[1]