Colt Knost (born June 26, 1985) is an American professional golfer who won the 2007 U.S. Amateur and U.S. Amateur Public Links. He has played on the Nationwide Tour and the PGA Tour.
Knost was born in Cleveland, Ohio. He attended Southern Methodist University. In July 2007 he won the U.S. Amateur Public Links over Cody Paladino, 6 & 4. In August 2007 he won the U.S. Amateur, 2 & 1 over Michael Thompson. He played on the 2007 Walker Cup team. He was the number one ranked golfer in the World Amateur Golf Ranking for five weeks in 2007.
Shortly after winning the 2007 U.S. Amateur, he turned professional, forfeiting his invitations to The Masters, the U.S. Open, and the British Open. He received heavy criticism from professional golfers.