Oslo City Museum

Oslo City Museum is a department of Oslo Museum in Oslo, Norway since 2006. The museum is located at Frogner Manor in Frogner Park.The museum was first founded in 1905 as the association Det gamle Christiania. Initiator and committee leader until 1912 was architect Fritz Holland. A committee members included Bishop of Oslo Anton Christian Bang, architects Torolf Prytz and Harald Olsen, artist Eilif Peterssen and military officer Thomas Heftye. The museum moved into the main building at Frogner Manor in 1909.

Oslo City Museum was a private association until the end of 2005. In 2006 it became part of the newly established Oslo Museum, together with two other museums; the Intercultural Museum and the Theatre Museum. Oslo Museum is now headquartered at Frogner Manor.Oslo City Museum has an extensive library with the purpose of documenting the history of the City of Oslo, as well as the former municipality Aker.