Gretton is a surname. Notable people with the surname include:
George Gretton (born 1950), Scottish lawyer and academic Jennifer Gretton, Baroness Gretton (born 1943), English baroness Peter Gretton (1912–1992), Admiral in the Royal Navy Rob Gretton (1953–1999), Musicians' manager William Gretton (1736–1813), a master of Magdalene College, Cambridge