Walter Charles Hagen was an American professional golfer and a major figure in golf in the first half of the 20th century. His tally of 11 professional majors is third behind Jack Nicklaus (18) and Tiger Woods (15). Known as the "father of professional golf," he brought publicity, prestige, big prize money, and lucrative endorsements to the sport. Hagen is rated one of the greatest golfers ever.

A professional golfer is somebody who receives payments or financial rewards in the sport of golf that are directly related to their skill or reputation. A person who earns money by teaching or playing golf is traditionally considered a "golf pro", most of whom are teachers/coaches. The professional golfer status is reserved for people who play, rather than teach, golf for a career.