Otto Gustave Albert Hackbarth (March 11, 1886 – July 24, 1967) was an American professional golfer and club maker who played in the early-to-mid 20th century.

His brother Herman served as the professional at Little Rock Country Club from 1907–56 and designed a number of courses in Arkansas.

[5] In 1903, Hackbarth was playing out of Oconomowoc Country Club when he was a contestant in the Western Open in Milwaukee that year.

An expert club maker, he was known for his patented putter design called "the Hackbarth" that he created circa 1910.

[7] The great amateur, Chick Evans, used the putter as did prolific tournament winner Arthur Bartlett from Iowa.

[8] Hackbarth won the 1940 PGA Seniors' Championship held at the North Shore Club in Sarasota, Florida, beating Jock Hutchison in a second 18-hole playoff.

= Unknown R64, R32, R16, QF, SF = Round in which player lost in PGA Championship match play "T" indicates a tie for a place Yellow background for top-10.