William Stephen Flynn (December 25, 1890 – January 24, 1944) was a prominent golf course architect during the early part of the 20th century. Flynn is most noted for designing Shinnecock Hills Golf Club on Long Island and Cherry Hills Country Club, Huntingdon Valley Country Club, Lancaster Country Club, and for his work at the Merion Golf Club.
Flynn, along with A.W. Tillinghast, George C. Thomas, Jr., Hugh Wilson, George Crump, and William Fownes together made up the "Philadelphia School" of golf course architecture. Together, the group designed over 300 courses, 27 of which are on in the top 100 golf courses in the world.[1]