Terry J. Diehl (born November 9, 1949) is an American professional golfer who played on the PGA Tour from 1973 to 1983. Diehl was born and raised in Rochester, New York. At the age of 15, he won the international long drive competition when he hit a ball 340 yards. He attended the University of Georgia from 1968 to 1971 and was a member of the golf team, an All-American in 1969.