William S. Root (1923–2002) was an American professional bridge player who was also a noted teacher and writer about the game. He was inducted into the American Contract Bridge League Hall of Fame in 1997, and was author of several acclaimed books on bridge, including Commonsense Bidding: The Most Complete Guide to Modern Methods of Standard Bidding and How to Play a Bridge Hand: 12 Easy Chapters to Winning Bridge by America's Premier Teacher.
