Gränsö Slott, Manor house in Västervik, Sweden

Gränsö Slott is a manor house on the Gränsö peninsula about four kilometres from Västervik in Kalmar County. Its main building was raised in wood in 1807 by Olof Johan Risselskiöld and enlarged several times during the 19th century. After a 1993 fire it was rebuilt in 1994, and the estate now operates as a resort with a hotel, spa and restored English park.

The castle was built in 1807 and destroyed by a major fire in 1993, then reconstructed in 1994. The rebuilding returned the estate to active use and gave it its current form.

Gränsö's name comes from its position at the border (gräns) of the old parish land. Since the early 2000s the estate has hosted concerts and exhibitions, and the former Liberal Party leader Lars Leijonborg gave several of his summer speeches here. The grounds are now a resort with a hotel and spa.

The manor lies on the Gränsö peninsula about 4 km from Västervik, with a boat jetty by the water. The English park has been restored, and a hotel and spa have been added under owner Per Johansson. The grounds host concerts and exhibitions, and the site is reached by road from Västervik.

Gränsö was inherited within the Fleetwood family from 1886 until baron Robert Fleetwood, born 1924, became its last private owner. Former Liberal People's Party leader Lars Leijonborg held several of his summer speeches on the estate. Since the turn of the millennium owner Per Johansson has directed a large expansion, restoring the English park and adding a hotel and spa.