George Underdown (12 May 1859 – 29 May 1895) was an English cricketer. He made his first-class debut playing for the United XI against the touring Australians at Priory Park Ground in Chichester, Sussex. The United XI featured the great W.G. Grace.Thereafter Underdown represented Hampshire in nine first-class matches from 1883 until 1885, the year which was to be the clubs final season with first-class status until the 1895 County Championship.