Halensee is a locality (Ortsteil) of Berlin in the district (Bezirk) of Charlottenburg-Wilmersdorf. Halensee was established as a villa and tenement settlement in about 1880, in the suburb of Wilmersdorf, which became part of Greater Berlin in 1920. In 2004, Halensee became its own Ortsteil. With an area of 1.27 km2 it is the smallest Ortsteil in Berlin after Hansaviertel.