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Dullahan (February 8, 2009 – October 20, 2013) was an American Thoroughbred racehorse. As a two-year-old he recorded his first win in the Grade I Breeders' Futurity Stakes. In early 2012, he won the Blue Grass Stakes, finished third in the Kentucky Derby and was the beaten favorite for the Belmont Stakes. Later in the season, he defeated older horses in the Pacific Classic. He was euthanized of a ruptured colon on October 20, 2013 at Winstar Farm in Versailles, Kentucky.