Grigory Ivanovich Polyakov (Russian: Григорий Иванович Поляков; February 16, 1876 – April 4, 1939) was a Russian and Soviet ornithologist. He founded and published an ornithological bulletin for eight years in which he published extensively. Arrested in 1927 he continued his research in labour camp and was rehabilitated posthumously only in 2003. He was a student of Fyodor Lorenz (1842-1909).