William John Horschel was born on December 7, 1986, and he is an American professional golfer who currently plays on the PGA Tour.

Horschel accepted an athletic scholarship to attend the University of Florida, Gainesville, where he played for coach Buddy Alexander's Florida Gators men's golf team in National Collegiate Athletic Association (NCAA) competition from 2006 to 2009.

He was a four-time All-American, including three first-team honors, and the Southeastern Conference (SEC) player of the year in 2007 and 2009.

He was a 2008 PING southeast all-region selection. He graduated from the University of Florida with a bachelor's degree in sport management in 2009. He represented the United States at the Palmer Cup on two occasions in 2007 and 2008 gaining 4.5 points. He posted a 3–1 record for the victorious 2007 Walker Cup team.

Horschel turned professional in 2009. In December 2009, he successfully gained a 2010 PGA Tour card through qualifying school. A wrist injury limited Horschel to four PGA Tour events that year, and he did not make the cut in any of them.

In June 2022, Horschel won Memorial Tournament at Muirfield Village in Dublin, Ohio, his seventh PGA Tour title.

In September 2022, Horschel was selected for the U.S. team in the 2022 Presidents Cup; he won one and lost two of the three matches he played.

Horschel met Brittany Nelson when both were golfers at the University of Florida. They were married in 2010 and have three children. Horschel is also a supporter of West Ham United F.C.