Bertram Robert Firestone (August 18, 1931 – July 12, 2021) and Diana Johnson Firestone (born January 26, 1932) of Newstead Farm in Upperville, Virginia were major owner/breeders of Thoroughbred equestrian and flat racing horses. They were voted the 1980 Eclipse Award for Outstanding Owner and in 1982 were inducted in the Virginia Thoroughbred Association Hall of Fame. They are former owners of Calder Race Course and Gulfstream Park in Florida. Their Genuine Risk was known for winning the 1980 Kentucky Derby.