John Clayton VanOrnum (born October 20, 1939, at Pasadena, California) is an American former professional baseball player, manager, coach and scout. From 1980 through 1984, VanOrnum served as the bullpen coach of the San Francisco Giants of Major League Baseball. After his term as a Giants' coach under Dave Bristol, Frank Robinson and Danny Ozark, VanOrnum then worked as a Major League and advance scout for the Giants, Dodgers, Angels and Atlanta Braves through 2004.