The Abgeordnetenhaus of Berlin is the state parliament (Landtag) of Berlin, Germany according to the city-state's constitution. In 1993 the parliament moved from Rathaus Schöneberg to its present house on Niederkirchnerstraße in Mitte, which until 1934 was the seat of the Prussian Landtag. The current president of the parliament is Cornelia Seibeld (CDU).

A Landtag is generally the legislative assembly or parliament of a federated state or other subnational self-governing entity in German-speaking nations. It is usually a unicameral assembly exercising legislative competence in non-federal matters.