Urban Sea (18 February 1989 – 2 March 2009) was an American bred Thoroughbred racemare best known for winning France's most prestigious race, the Prix de l'Arc de Triomphe, in 1993 and for her importance as a world-class broodmare. She is one of ten mares to produce two Derby winners, namely Galileo and Sea the Stars. She is the only mare in the 21st century to produce two Derby winners. None has produced three winners of this race.