Gamlehaugen is a mansion located in Bergen, Norway. It was built in 1900 and was originally the residence of Christian Michelsen, who was the first prime minister of Norway after its separation from Sweden in 1905. The mansion is situated on a hilltop overlooking the city and offers stunning views of the surrounding area.

The architecture of the mansion is a mix of various styles, including Art Nouveau and Neoclassicism. The interior of the mansion is lavishly decorated and features many antique furnishings, paintings, and other works of art.

Today, Gamlehaugen is owned by the Norwegian state and serves as the official residence of the King of Norway when he visits Bergen. The mansion is also open to the public for guided tours and is a popular destination for tourists visiting Bergen. The grounds of Gamlehaugen include a large park with walking paths, gardens, and a lake.