Justin Arch "Jay" Williamson IV (born February 7, 1967) is an American professional golfer who has played on the PGA Tour and the Nationwide Tour. Williamson was born in St. Louis, Missouri. He attended Trinity College and was a member of the Division III baseball and hockey teams. After graduating from Trinity College, he turned professional in 1990. Williamson has no PGA Tour victories, although he has finished second twice, both playoff losses – to Hunter Mahan at the 2007 Travelers Championship, and to Kenny Perry at the 2008 John Deere Classic. He won once on the Nationwide Tour: the 2007 Fort Smith Classic. He has more than $5.9 million in career earnings on the PGA Tour.

Professional wins (2)

Nationwide Tour wins (1)

Nationwide Tour playoff record (0–1)

Other wins (1)

Playoff record

PGA Tour playoff record (0–2)

Results in major championships

{{legend|#eeeeee|Did not play}} CUT = missed the halfway cut DQ = Disqualified T = Tied Note: Williamson never played in the Masters Tournament or the PGA Championship.