Grigory Spiridonovich Petrov (Russian: Григорий Спиридонович Петров; 6 February 1866 – 1925) was a priest, public figure, and publicist. Petrov was born in Yamburg (now Kingisepp, Leningrad Oblast) and graduated from St. Petersburg Theological Seminary in 1886 and St. Petersburg Theological Academy in 1891. From 1895 through to 1906, he served as a prior of the Church of Mikhaylovsky Ordnance Academy; while in 1902–1904 he also worked as a lecturer of theology at the Polytechnical Institute. He wrote books, brochures and articles where he advocated Christian socialism. In 1899–1917, he contributed to Russkoe slovo newspaper. In 1901–1903, he took part in various religious and philosophic meetings. In 1905, he joined the liberal renovated church movement in opposition to the Russian Orthodo