Treptow-Köpenick (German pronunciation: [ˈtʁeːpto ˈkøːpənɪk] ⓘ) is the ninth borough of Berlin, Germany, formed in Berlin's 2001 administrative reform by merging the former boroughs of Treptow and Köpenick.

Among Berlin's boroughs it is the largest by area with the lowest population density.

Treptower Park, a popular place for recreation and a tourist destination, is also located in the borough.

It has responsibility for passing laws and electing the city government, including the mayor.

Since the 2021 municipal elections, the composition of the district government is as follows: Treptow-Köpenick is twinned with:[3]