Justin James Speier (born November 6, 1973) is an American former professional baseball pitcher in Major League Baseball. He attended Brophy College Preparatory in Phoenix, Arizona. Upon graduation from Brophy Prep, Speier attended the University of San Francisco where he played catcher for the Dons. He also attended Nicholls State University. Speier served in the United States Marine Corps Reserve. He is the son of former major league player and coach Chris Speier and the cousin of Gabe Speier, a pitcher currently with the Kansas City Royals.