Østerbro is one of the 10 official districts of Copenhagen Municipality, Denmark. It is located just north of the city centre, outside the old city gate Østerport which, after it was moved around 1700, used to be located close to present-day Østerport Station. From the beginning, Østerbro has been a wealthy district, and it remains one of the most affluent areas in Copenhagen.

Copenhagen Municipality, 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, the other three being Dragør, Frederiksberg, and Tårnby. The Municipality of Copenhagen constitutes the historical city centre and the majority of its landmarks. It is the most populous in the country with a population of 656,787 inhabitants, and covers 86.4 square kilometres (33.4 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.