Terry J. Diehl (born November 9, 1949) is an American professional golfer who played on the PGA Tour from 1973 to 1983.

At the age of 15, he won the international long drive competition when he hit a ball 340 yards.

Diehl had more than 20 top-10 finishes in PGA Tour events including a win at the 1974 San Antonio Texas Open; he shot a 19-under-par 269 and won by one stroke over Mike Hill.

Diehl left the PGA Tour after the 1983 season to pursue other endeavors that included a stint in the PGA Tour's marketing department, a commentator for ESPN, a club pro, a stockbroker[1] with Prudential Securities and a senior vice president in portfolio management at Morgan Stanley in Rochester.

[2] PGA Tour playoff record (0–1) Note: Diehl never played in The Open Championship.