Motivator (foaled 22 February 2002) is a British Thoroughbred racehorse and active sire. In a racing career which lasted from August 2004 until October 2005, he ran seven times and won four races. He is best known as the winner of the 2005 Epsom Derby. He was retired to stud, where he sired the dual Prix de l'Arc de Triomphe winner Treve.