William Clark Fownes Jr. (October 2, 1877 – July 4, 1950)[1] was an American amateur golfer.

His father, Henry Fownes, founded and designed Oakmont Country Club.

He defeated Chick Evans (winner in 1916 and 1920) in the semi-finals, 1 up, after being down two with four holes to play.

[3] Fownes served as president on the United States Golf Association from 1926 to 1927.

Tillinghast, George C. Thomas, Jr., Hugh Wilson, George Crump, and William Flynn together made up the "Philadelphia School" of golf course architecture.