Michael Ray Matz (born January 23, 1951 in Collegeville, Pennsylvania) is an American Olympic equestrian rider and horse trainer. As a trainer, he trained the ill-fated Barbaro to win the 132nd Kentucky Derby horse race in 2006, before the previously undefeated colt suffered a career and life ending injury, shortly after the start of horse racing's second leg of the triple crown, the Preakness Stakes, just two weeks later.