Eugene Claude Harmon, Sr. (July 14, 1916 – July 23, 1989) was an American golfer.
Harmon was born in Savannah, Georgia, and spent much of his boyhood in the Orlando area. A youthful prodigy, Harmon qualified for the U.S. Amateur at age 15 in 1931. He was the last-ever club professional to win a major championship, winning the 1948 Masters Tournament by five shots, and earning $2,500 for his efforts. Harmon served as the head professional at the New York City area club, Winged Foot Golf Club from 1945 to 1968, and also served as the winter professional for many years at the Seminole Golf Club in Florida. In 1959, he was hired as the head professional at Thunderbird Country Club in Palm Springs, California, where he served for over a decade, and finally took a club job in the Houston area. In 1959, Harmon played in the U.S. Open that was held at Winged Foot, placing third. Harmon was a close friend of legendary star Ben Hogan, and the two played together frequently and worked together on their games. Harmon was a semi-finalist three times in the PGA Championship, competing as a club pro against many players who competed full-time.