Copenhagen Municipality (Danish: Københavns Kommune), also known in English as the Municipality of Copenhagen, located in the Capital Region of Denmark, is the largest of the four municipalities that constitute the City of Copenhagen (Byen København), the other three being Dragør, Frederiksberg, and Tårnby. The Municipality of Copenhagen constitutes the historic city center and the majority of its landmarks. It is the most populous in the country with a population of 667,099 inhabitants (as of January 2025), and covers 90.9 km (35.1 sq mi) in area,. Copenhagen Municipality is located at the Zealand and Amager islands and totally surrounds Frederiksberg Municipality on all sides. The strait of Øresund lies to the east. The city of Copenhagen has grown far beyond the municipal boundaries from 1901, when Frederiksberg Municipality was made an enclave within Copenhagen Municipality. Frederiksberg has the largest population density of the municipalities of Denmark.
The municipal seat of government is the Copenhagen City Hall (Danish: Københavns Rådhus), the headquarters of the Copenhagen City Council. The acting Lord Mayor of Copenhagen is Lars Weiss, since August 29, 2024. The relationship between Copenhagen Municipality and the wider city of Copenhagen is one of an administrative unit within a significantly larger city, cf. the City of London or the City of Brussels.