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.

The Law on the Reconstruction of the Reich of 30 January 1934, was a sweeping constitutional change to the structure of the German state by the government of Nazi Germany. It was one of the key pieces of legislation that served as the basis for the policy of Gleichschaltung, or coordination, by which Adolf Hitler and the Nazi Party successfully established their totalitarian control over all aspects of the German government and society. The law abolished the independent parliaments (Landtage) of the then-extant 16 German states, transferred the states' sovereignty to the central government and essentially converted Germany from a federal republic to a highly centralized unitary state.