Doyen (foaled 22 April 2000) is a retired Thoroughbred racehorse, who was bred in Ireland but trained in France, Dubai and the United Kingdom during a racing career which lasted from 2002 to 2005.

After capturing a minor race at Saint-Cloud,[5] he won the Listed Coupe des Trois Ans at Lyon-Parilly "easily" by two lengths.

[6] Moved up to Group Race standard for the first time in June 2004, he outpaced his opponents to record a four length win in the Prix du Lys at Longchamp.

He raced prominently, before being moved wide to make a challenge in the straight, but although he stayed on well he was unable to reach the lead, and finished fourth to Dalakhani.

He was then sent to Royal Ascot for the Hardwicke Stakes, where he produced his best performance to date, taking the lead in the straight and pulling clear to win by six lengths in a course record time of 2:26.53.

[9] So impressive was Doyen's victory that he was made clear favourite for the following month's King George VI and Queen Elizabeth Stakes over the same course and distance, and he was even blamed for the absence of top-class three-year-olds in the race.