Bold Reason (1968–1985) was an American Thoroughbred racehorse and Champion broodmare sire. Bred by Harry Guggenheim, he was sired by Hail To Reason, the 1970 Leading sire in North America. His dam was Guggenheim's excellent runner Lalun who also produced Never Bend. He was bought as a yearling for $52,000 by William Levin at the 1969 Guggenheim dispersal sale.As a three-year-old competing in the 1971 U.S.