Ericsberg Castle, 17th-century castle in Katrineholm, Sweden

Ericsberg Castle is a three-level building with four wings and towers, located in Katrineholm, Sweden. A chapel wing extends from the southwest corner, while a fountain sits along the southern wall.

The estate appears as Pintorp in 1508, when Knut Nilsson of Bosgård sold it to Anna Karlsdotter, widow of Erik Eriksson Gyllenstierna the Younger; it stayed with the Gyllenstierna family until 1733. Erik Karlsson Gyllenstierna (1602–1657) began the present palace, which his widow Beata von Yxkull completed and renamed Ericsberg after him. Their son Kristofer had Nicodemus Tessin the Elder add wings and exterior decoration. The Bonde family took over in 1808 and restored the building, notably in 1897 under Isak Gustaf Clason.

The name Ericsberg was given by Beata von Yxkull after her husband Erik Gyllenstierna. Legend calls her the Pintorpafrun, said to haunt the estate. The private library founded by Carl Jedvard Bonde grew to 50,000 volumes, mostly on Swedish cultural history, and was largely sold in the early 2000s.

The castle park is open to the public and holds a baroque garden, a rose garden, a spring garden, a landscape park and an Italian park, plus a copy of the Hampton Court maze. An orangery built in 1856 is still in use. The grounds are also used for horse training and riding events.

The castle archive holds documents from 1508, when the estate was called Pintorp before later ownership changes. Records reveal how this property passed through the hands of major Swedish noble families over the centuries.