Eight Thirty (1936–1965) was an American Hall of Fame Thoroughbred racehorse. He was owned by George D. Widener, Jr. and bred by his Erdenheim Farm. Widener is one of only five people ever named an Exemplar of Racing. Eight Thirty was a descendant of Fair Play, who had been purchased from the estate of August Belmont, Jr. by Widener's uncle, Joseph E. Widener. Racing at age two in 1938, Eight Thirty won two important graded stakes races but was overshadowed by William Ziegler, Jr.'s Champion 2-Yr-Old Colt El Chico.