Museumsinsel Lüttenheid, Cultural museum complex in Heide, Germany.

Museumsinsel Lüttenheid is a museum complex in Heide featuring several historic buildings that present regional history and daily life. The site includes the Old Smithy, Stade House, and Horse Stable, each displaying different aspects of how people lived and worked in this area.

The museum complex was established in 2004 and uses historic buildings to document Heide's development since its founding in 1434. It also records the period of the Dithmarscher Farmers Republic, an important chapter in the area's past.

The Klaus Groth section displays personal documents and handwritten works from the acclaimed Low German poet within an 1796 building. Visitors can observe how this regional writer's literary legacy is preserved through original materials and period furnishings.

The complex sits southeast of Heide's Marktplatz in the Lüttenheid quarter, in the former craftsmen's and petty-bourgeois district. The permanent exhibition is split between the 1905 smithy building, whose upper floor holds a hall for special exhibitions and cultural events, the 1925 horse stable used since 2001, and the adjoining Stadehaus, opened in September 2011. The whole area has been under monument protection since 2017.

The horse stable, built in 1925 and part of the smithy, has housed part of the permanent exhibition since 2001. Inside, several reconstructed workshops show old Heide crafts. The smithy itself is a thoroughly renovated building from 1905, with a large hall upstairs for special exhibitions and cultural events.