William J. Weiss (June 2, 1925, Chicago – August 16, 2011, San Mateo, California), was an American baseball historian and statistician. He served as the official statistician for the Pacific Coast League, and edited a weekly newsletter for the California League for over thirty years. For over forty years, he created sketchbooks which eventually covered over 200 books about all of the players in several minor league and Major League organizations. Those sketches are the only records existent of many minor league organizations' and players' statistics.