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The Prussian Constitution of 1920 (German: Verfassung von Preußen 1920) formed the legal framework for the Free State of Prussia, a constituent state of the Weimar Republic, from 1918 to 1947. It was based on democratic parliamentary principles and replaced the Constitution of 1848/50. During the National Socialist era, it was eroded to the point of irrelevance and following World War II lost legal force when the state of Prussia was abolished by the Allies in 1947.
The Constitution provided for a Landtag (parliament) elected by proportional representation under universal suffrage for both men and women, and a State Council (Staatsrat) elected by local parliaments to represent the interests of Prussia's provinces. Executive authority rested with the State Ministry, headed by a minister president who was elected by and responsible to the Landtag. He appointed and directed the other ministers and was responsible for setting policy. Unlike the Weimar Constitution, the 1920 Prussian Constitution did not provide for a president. While it remained in force, Prussia was among the most stable and democratic states of the Weimar Republic.