Montjeu (1996 – 29 March 2012) was an Irish-bred, French-trained thoroughbred horse racing racehorse and sire. In a racing career which lasted from September 1998 to November 2000 he ran sixteen times and won eleven races. After winning twice as a juvenile, he was the outstanding European racehorse of 1999, winning the Prix du Jockey Club, the Irish Derby and the Prix de l'Arc de Triomphe. Four more victories in 2000 included the King George VI and Queen Elizabeth Stakes.