The 1921 Persian coup d'état () refers to several major events which led to the establishment of the Pahlavi dynasty as Iran's ruling house in 1925. Iran's parliament amended the 1906–1907 constitution on December 12, 1925, replacing the 1797–1925 Qajar dynasty with the Pahlavi dynasty as the legitimate sovereigns of Iran. The revolution was followed by the Jungle Movement of Gilan (1914-1921).