Fenomeno (Japanese: フェノーメノ, foaled 20 April 2009) is a Japanese Thoroughbred racehorse and sire. After winning one minor race as a two-year-old he emerged as a top-class performer in the following year, taking the Aoba Sho and St Lite Kinen and finishing a close second in both the Tokyo Yushun and the autumn edition of the Tenno Sho. In his third campaign he won the Nikkei Sho and the spring edition of the Tenno Sho before his season was ended by injury. At the end of that year he was rated the best horse in the world over extended distances. He won a second Tenno Sho in 2014 but failed to win again and was retired to stud at the end of 2015.