Strömsholm Palace, sometimes called Strömsholm Castle (Swedish: Strömsholms slott), is a Swedish royal palace. The baroque palace is built on the site of a fortress from the 1550s, located on an island in the Kolbäcksån river at the west end of Lake Mälaren. The palace has interiors from the 18th century and an important collection of Swedish paintings.
King Gustav Vasa had a fortress built at Strömsholm in the 1550s. From 1560 until 1621, it served as the residence of queen dowager Catherine Stenbock, and after this, it was given to a later queen dowager, Maria Eleonora of Brandenburg who, however, preferred to reside at Gripsholm Castle. Finally, in 1654, it was given by King Charles X to Queen Hedvig Eleonora.
The old palace of the 1550s later provided the foundation for the present Strömsholm Palace, built in 1669-1674 for Queen Hedvig Eleonora to a design by Nicodemus Tessin the Elder. The palace consists of a central building framed by four square corner towers. On the park side, there is a large, domed central tower. Around 20 estate buildings were erected at the same time as the palace, and the first stages of a park in the French baroque style were laid out.
Work on the interiors came to a halt when the building's fabric was completed. Not until the 1730s was the first phase of interior work carried out, including a palace chapel in the attic designed by the Swedish architect Carl Hårleman. The interiors at Strömsholm Palace are largely Gustavian in style. In 1766 the heir to the Swedish throne, later King Gustav III, married Princess Sophia Magdalena of Denmark. As a wedding present from the Riksdag of the Estates, she was given Strömsholm Palace. Extensive interior works commenced, under the architectural direction of Carl Fredrik Adelcrantz, and continued into the 19th century. The queen's bedchamber is a prime example of Swedish interior design from the start of the Gustavian era, as well as the Chinese dining room with its fabric-covered walls with Chinese style paintings done by the renowned tapestry painter Lars Bolander.