Zachary Stuart Littell is an American professional baseball pitcher for the Arizona Diamondbacks of Major League Baseball (MLB). He has previously played in MLB for the Minnesota Twins, San Francisco Giants, Boston Red Sox, Tampa Bay Rays, Cincinnati Reds, and Washington Nationals. Littell was selected by the Seattle Mariners in the 11th round of the 2013 MLB draft and made his MLB debut with the Twins in 2018.