Schloss Wietersheim, Château in Petershagen, Germany.

Schloss Wietersheim stands on a middle terrace on the eastern bank of the Weser, at river kilometre 210, about nine kilometres north of Minden. The original complex consisted of timber-framed buildings; the later chapel was built in masonry and rebuilt around 1810 as the present compact eight-sided building in Neoclassical style. It is privately owned.

Built in 1323, the castle served for centuries as a knight's estate and commandery of the Knights of St. John. Its position on the border between the Prince-Bishopric of Minden and the County of Schaumburg drew it into repeated border disputes, and it was destroyed several times. In 1799 it was sold for 103,000 thalers to Philipp von Cornberg, a canon of Minden Cathedral; the commandery continued formally until 1811 as a financial endowment.

The name Wietersheim recalls the Kommende of the Knights of St John, which held the estate until 1811, when it survived only as a financial commandery paying interest on capital. In 1810 the King of Westphalia made Félicité-Mélanie Legarde, a daughter of Jérôme Bonaparte, "Countess of Wietersheim"; her husband Carl von Schlotheim, a Minden district administrator, lived here.

Schloss Wietersheim is privately owned and not open to the public, so there is no visitor access to the building or grounds. It stands on the eastern bank of the Weser at river kilometre 210, about nine kilometres north of Minden in the Wietersheim district of Petershagen. The site can be viewed from the public riverside path and surrounding meadows.

The three garden areas recorded at the start of the 18th century were lost completely when the grounds were cleared after the Second World War; the garden seen today is a new layout. The castle itself was badly damaged while the Windheim district was requisitioned for displaced persons from May 1945 to February 1949, and rebuilding only began once the requisition was lifted.