William Harlan Haas (born May 24, 1982) is an American professional golfer who is currently a member of the PGA Tour.
Haas was born in Charlotte, North Carolina and was raised in Greer, South Carolina, a suburb of Greenville. He was the third member of his family to play golf at Wake Forest University in Winston-Salem, North Carolina following his father, Jay, and uncle, Jerry. Haas had a distinguished college career. He was a three-time first-team All-American, four-time All-ACC, two-time ACC player-of-the-year, and 2001 ACC rookie-of-the-year. During his college career, he won ten college tournaments; and in his senior year of 2004, he won the Haskins Award, the Jack Nicklaus Award, and the Ben Hogan Award. He also set an NCAA record for lowest scoring average. Haas was a member of the 2003 Walker Cup team as well as two Palmer Cup teams. He turned professional in 2004.
Haas was a member of the Nationwide Tour in 2005 after failing to earn his PGA Tour card in Qualifying School. His best finish in a Nationwide Tour event was a solo 2nd at the 2005 Scholarship America Showdown.