Chattenburg, Heritage château in Kassel, Germany

Chattenburg was a neoclassical château in Kassel with a large inner courtyard and wings extending to the east. The complex measured roughly 50 by 60 meters and was designed as a modern residence for the Elector, though later buildings replaced it.

Construction began in 1816 on the ruins of the destroyed city palace, marking a new direction in royal architecture. The structure was later demolished and replaced by a modern office building erected between 1957 and 1960.

The name Chattenburg refers to the Chatti, the Germanic tribe from whom Hesse derives its name; Wilhelm I. had failed at the Congress of Vienna to be crowned "King of the Chatti" but still named his palace after them. The building was never completed, so no ornate facade ever existed; only the ground floor was built before work stopped in 1821.

The site is now occupied by a modern administrative building that is not easily accessible to the public. Visitors can explore the history through surviving foundations and historical records found in the surrounding area.

The red sandstone of the Chattenburg's base course was removed between 1840 and 1870 and reused in the Neue Galerie, built just to the south between 1871 and 1874. The palace itself never rose above its first storey in rough construction.