The 2015 Prix de l'Arc de Triomphe was a horse race held at Longchamp on Sunday 4 October 2015. It was the 94th running of the Prix de l'Arc de Triomphe.

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2015 Prix de l'Arc de Triomphe

Location	Longchamp Racecourse
Date	October 4, 2015 (2015-10-04)
Winning horse	Golden Horn
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The winner was Anthony Oppenheimer's Golden Horn, a three-year-old colt trained in England by John Gosden and ridden by Frankie Dettori. Golden Horn's victory was the first in the race for his owner and trainer and was a record-equaling fourth success for Dettori. Golden Horn became the seventh winner of the Epsom Derby to win the Arc, following Sea Bird, Mill Reef, Lammtarra, Sinndar, Sea the Stars and Workforce.

The five-year-old mare Treve attempted to become the first horse to win the race three times after her successes in 2013 and 2014. She entered the race unbeaten in three races in 2015, including the Grand Prix de Saint-Cloud and the Prix Vermeille. Her main opposition seemed to come from two three-year-old colts: Golden Horn and New Bay. The British trained Golden Horn's wins had included the Epsom Derby, the Eclipse Stakes and the Irish Champion Stakes. New Bay had appeared to be the best middle-distance colt of his generation in France, winning the Prix du Jockey Club and the Prix Niel. Ireland was represented by Free Eagle (Prince of Wales's Stakes), Found (the top-rated filly of her generation in 2014) and Tapestry (Yorkshire Oaks). Apart from Golden Horn, the only other British challenger was Eagle Top who finished second in the King George VI and Queen Elizabeth Stakes. The other French contenders were Flintshire, Erupt (Grand Prix de Paris), Dolniya (Sheema Classic), Prince Gibraltar (Grosser Preis von Baden), Manatee (Grand Prix de Chantilly), Siljan's Saga (Grand Prix de Deauville), Silverwave (Prix La Force), Spiritjim (disqualified after winning the 2014 Grand Prix de Saint-Cloud), Frine (Prix de Royallieu) and Shahah (Prix d'Aumale) who was expected to act as a pacemaker for Treve. Meleagros was a non-runner. Treve was made the 9/10 favourite ahead of New Bay on 4.8/1 and Golden Horn on 5.2/1. Free Eagle (16.8/1) and Flintshire (18.6/1) were next in the betting ahead of Dolniya (27/1), Found (28/1) and Erupt (29/1).^[1]

Sahah fulfilled her expected role as a pacemaker, taking the lead soon after the start. Flintshire and New Bay were close behind, whilst Dettori took Golden Horn to the far outside before tracking right to drop in just behind the leader. Treve was among the backmarkers in the early stages along with Found. As the field entered the straight Golden Horn went to the front, opened up a clear advantage and won by two lengths. Flintshire stayed on to take second just ahead of New Bay and Treve.

Trainers are based in France unless indicated.

• Abbreviations: ns = nose; shd = short-head; hd = head; snk = short neck; nk = neck

• Sponsor: Qatar Racing and Equestrian Club
• Purse:5.000.000 €
• Going: Good
• Distance: 2,400 metres
• Number of runners: 17
• Winner's time: 2m 27.23s

Leading progeny of participants in the 2015 Prix de l'Arc de Triomphe.^[2][3][4][5]