The Teufelsberg (German for Devil's Mountain) is a hill in Berlin, Germany, in former West Berlin. It rises about 80 meters above the surrounding Brandenburg plain, more precisely the north of Berlin's Grunewald forest. It was named after the Teufelssee (i.e. Devil's lake) in its southerly vicinity.

It is an artificial hill with a curious history: It was heaped up after the Second World War from part of the rubble of Berlin, approximately 75,000,000 m³ (98,000,000 cu yd) all over the city, during the following twenty years as the city was cleared and rebuilt. After the Communist putsch in the city parliament of Greater Berlin (for all four sectors of Berlin) in September 1948, separate parliaments and magistrates (German: Magistrat von Groß Berlin; city government) were formed for East and West Berlin. This also ended much of the cooperation between West Berlin and the state of Brandenburg, surrounding West Berlin in the North, West and South.

While part of the rubble from destroyed quarters in East Berlin was deposited outside the city boundary, all the debris from West Berlin had to be dumped within the western boundary. Due to the shortage of fuel in West Berlin the rubble transport stopped during the Berlin Blockade.