Summoner (foaled 2 March 1997) was a British-bred Thoroughbred racehorse best known for his upset win in the 2001 Queen Elizabeth II Stakes. In his early career the horse showed good, but unexceptional form, winning four races but looking to be overmatched when tried against top class opposition. In the Queen Elizabeth II Stakes he was employed as a pacemaker but after he established a big lead his more fancied opponents were unable to catch him and he won at odds of 33/1. He later raced with little success in the United Arab Emirates and was gelded at the end of his racing career.