Randall Gilbert Marsh (born April 8, 1949) is a former umpire in Major League Baseball who worked in the National League from 1981 to 1999 and throughout both major leagues from 2000-2009. Marsh wore the uniform number 30. He umpired in the World Series in 1990, 1997, 1999, 2003, and 2006, serving as crew chief for the last three Series, and in the All-Star Game in 1985, 1988, 1996, and 2006, calling balls and strikes for the 1996 game. He is the tenth umpire in history to serve as crew chief for three World Series.