Aleksandr Ivanovich Vvedenskii (Russian: Александр Иванович Введенский) (Vitebsk, 30 August 1889 — Moscow, July 26, 1946) was a Russian spiritual. He studied theology at the University of St. Petersburg and was dedicated to Russian-orthodox priest. After the Russian Revolution the Soviet of Vvedensky was in Petrograd (Saint Petersburg) chosen and he joined the revolutionaries. After the victory of the Bolsheviks in the Russian civil war, Alexander Vvedensky was leader of the so-called "living Church", a pro-Communist Group of priests who pursued close cooperation with the Bolsheviks and had separated from the Russian Orthodox Church. Furthermore, the attitude of the Bolsheviks towards the living Church not positive, because they prefer not to support received from the faithful.