Adayar (foaled 31 March 2018) is an Irish-bred, British-trained Thoroughbred racehorse best known for winning the 2021 Epsom Derby. He showed promise as a two-year-old in 2020, winning the second of his two starts by nine lengths. In the following year he finished second in both the Sandown Classic Trial and the Lingfield Derby Trial before winning the Derby. On his next start, he became the first Derby winner in 20 years to follow up with a victory in the King George VI and Queen Elizabeth Stakes. Adayar is a son of the top stallion Frankel.