Bayardo (1906–1917) was a British bred Thoroughbred racehorse with an impressive record, both on the racecourse and at stud, where he was a leading sire.

Bay Ronald was a Thoroughbred racehorse that had a huge impact on the breeding of sport horses, mainly through his son Dark Ronald and grandson Teddy, and also carried on his lines in theThoroughbred racing world, through his son Bayardo. He appears in the pedigrees of many dressage, show jumping, and eventing horses today.