Köpenick (German pronunciation: [ˈkøːpənɪk] ) is a historic town and locality (Ortsteil) in Berlin, situated at the confluence of the rivers Dahme and Spree, in the southeast of the German capital. It was formerly known as Copanic and then Cöpenick, only officially adopting the current spelling in 1931. It is known for the imposter Hauptmann von Köpenick.
Prior to its incorporation into Berlin in 1920, Köpenick had been an independent town. It then became a borough of Berlin, and with an area of 128 km (49 sq mi), Berlin's largest. As a result of Berlin's 2001 administrative reform, the borough of Köpenick was merged with that of Treptow to create the current borough of Treptow-Köpenick.