Glückstädter Schloss, Renaissance château in Glückstadt, Germany

Glückstädter Schloss was a two-storey royal town residence in Glückstadt, built from 1629 for King Christian IV to designs by Willem van Steenwinckel. It had two large gables on the end walls and two smaller ones on the long sides, with a helmeted stair tower facing the courtyard. Nothing of the building survives; only the altered Provianthaus of 1705 remains on the site between Am Hafen and Am Proviantgraben.

Christian IV of Denmark marked out the building plot himself on 29 August 1629, and the castle was probably finished in 1631 as the royal town residence in Glückstadt, founded in 1617. Architect Willem van Steenwinckel designed it in the Nordic Renaissance style. Poor foundations in the damp ground made it unsafe, and it was demolished in 1708 under Frederick IV; no replacement was built.

The castle was the Danish king's town residence in a planned town founded in 1617, and the royal chancellery for Schleswig-Holstein was based in Glückstadt, moving in 1752 to the Wasmer-Palais, where an apartment was again set up for members of the Danish royal house. The name Glücksburg, also written Glyksborg or Danish Lyksborg, linked the building to the royal house of Glücksburg.

Nothing of the castle itself survives; the site lies near Glückstadt harbour, roughly between today's Am Hafen and Am Proviantgraben streets. The only remaining structure is the Provianthaus of 1705, heavily altered by 19th- and 20th-century conversions and now partly used by an artists' initiative. It stands in need of renovation, and its preservation is supported by the association Provianthaus in Glückstadt e. V.

The castle was built on the orders of Christian IV, who marked out the site himself on 29 August 1629; until then he had stayed at the Königshof when in Glückstadt. Poor foundations in the damp ground made the building unsafe, and it was demolished in 1708 under Frederick IV, with no replacement built. Only the Provianthaus of 1705, successor to a 1633 outbuilding, survives on the site.