Holsteinborg Castle is a manor house located 12 kilometres (7.5 mi) southeast of Skælskør, Slagelse Municipality, Denmark.

[1] A fortification was built in about 1200, approximately at the site of the current castle to guard Bisserup Harbour, then a naval support point.

[3] Frederik Adolph Holstein, 6th Count of Holsteinborg, belonged to Reventlow and Bernstorff's social circle.

[6] Ludvig Holstein-Holsteinborg, 7th Count of Holstein, who served as Council President in the early 1870s, owned Holsteinborg from 1836 to 1892.

[7] Andersen made his first visit to the estate in May 1856, noting in his diary that "The food was sumptuous, I was placed in a very elegant bedroom and a cabinet facing the great courtyard, which is rather similar to that of Kronborg".

The oldest part of the four-winged manor house is the west wing which was built by Børge Trolle in 1598.

The main gate is located in the north wing which is flanked by corner towers with spires from 1642 and 1649.

The northern part of the park retains elements of an earlier Baroque garden from 1725, including a 2 km (1.2 mi) long lime tree avenue.