Otto Braun (28 January 1872 – 15 December 1955) was a politician of the Social Democratic Party of Germany (SPD) during the Weimar Republic. From 1920 to 1932, with only two brief interruptions, Braun was Minister President of the Free State of Prussia. The continuity of personnel in high office resulted in a largely stable government in Prussia, in contrast to the sometimes turbulent politics of the Reich. During his term of office, Prussia's public administration was reorganized along democratic lines. He replaced many monarchist officials with supporters of the Weimar Republic, strengthened and democratized the Prussian police, and made attempts to fight the rise of the Nazi Party.