William Braden Thornberry (born April 11, 1997) is an American professional golfer noted for his amateur success.

He was the number one ranked amateur golfer in the world during 2018 and received the Haskins Award and the Mark H. McCormack Medal.

[2] Thornberry enrolled at the University of Mississippi in 2015 and played with the Ole Miss Rebels men's golf team.

[4] He represented the United States at the 2017 Walker Cup at Los Angeles Country Club, alongside Collin Morikawa, Scottie Scheffler and Will Zalatoris.

[8] He represented the United States in the 2018 Arnold Palmer Cup at Evian Resort Golf Club, and shot a round of 64 at U.S.

[5] Thornberry earned Mark H. McCormack Medal in August 2018, given to the world's highest ranked amateur after the U.S.