Pyotr Lavrovich Lavrov (Russian: Пётр Ла́врович Лавро́в; alias Mirtov (Миртов); (June 2 (June 14 N.S.), 1823 – January 25 (February 6 N.S.), 1900) was a prominent Russian theorist of narodism, philosopher, publicist, and sociologist. He entered a military academy and graduated in 1842 as an army officer. He became well-versed in natural science, history, logic, philosophy, and psychology. He also became an instructor in mathematics for two decades.