Hieromartyr, St. Hieromartyr Peter of Krutitsy (Священномученик Петр Крутицкий), born Petr Fyodorovich Polyansky (Петр Федорович Полянский) (June 28, 1862 – September 27, 1937), was a Russian Orthodox bishop and martyr. From April 12 till December 9, 1925 he was the head of the Russian Orthodox Church, serving as the Patriarchal locum tenens. Despite his imprisonment, he remained technically locum tenens until his death in 1937.