Cacoethes (7 March 1986 – 11 September 2009) was an American-bred, British-trained Thoroughbred racehorse and sire. After finishing third on his only start as a two-year-old he improved to become one of the best colts of his generation in Europe in the following year, winning the Lingfield Derby Trial and the King Edward VII Stakes as well as finishing second in the International Stakes and the King George VI and Queen Elizabeth Stakes and third in the Epsom Derby. In 1990 he showed his best form in Autumn when he won the Turf Classic and ran third in the Japan Cup. After his retirement from racing he stood as a breeding stallion in Japan.