Britannica Sources used in this answer

How many major professional championships did Jack Nicklaus win?

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Tiger Woods follows through on his golf swing after teeing off, standing in tall grass with spectators watching in the background at St Andrews Golf Links. — golf American golfer Tiger Woods competing at the British Open (Open Championship) at St. Andrews, Fife, Scotland, 2005.

Jack Nicklaus holds the record for the most victories in the four major professional championships, having won a total of 18 titles during his career.1

These major championships include:
* Masters Tournament: 6 wins (1963, 1965, 1966, 1972, 1975, 1986)
* U.S. Open: 4 wins (1962, 1967, 1972, 1980)
* PGA Championship: 5 wins (1963, 1971, 1973, 1975, 1980)
* British Open: 3 wins (1966, 1970, 1978)

In 1966, Nicklaus also became one of the few golfers to complete the career "Grand Slam" by winning all four of these major tournaments.1