The 1964 Open Championship was the 93rd Open Championship, played 8–10 July at the Old Course in St Andrews, Scotland. Tony Lema won his only major championship, five strokes ahead of runner-up Jack Nicklaus. He led by seven strokes after 54 holes and shot a final round 70. Neither had played the Old Course before and Lema had never played in Britain; he gave much of the credit for his victory to his caddy, Tip Anderson. It was Lema's fourth victory in six weeks; he won three events on the PGA Tour in June. Nicklaus equaled the course record with a 66 in the third round.

The PGA Championship was played the next week in Columbus, Ohio, one of five times in the 1960s that these two majors were played in consecutive weeks in July.

Lema played in two more Opens; two weeks after competing in 1966 at Muirfield, he and his pregnant wife were killed in a plane crash near Chicago.

^ The 10th hole was posthumously named for Bobby Jones in 1972

Previous lengths of the course for The Open Championship (since 1950):

The exemption categories were:

1. The first 20 and those tying for 20th place in the 1963 Open
Brian Allen, Peter Alliss, Bob Charles (3), Neil Coles, Max Faulkner, Jean Garaïalde, Harold Henning, Brian Huggett, Bernard Hunt, Alex King, Malcolm Leeder, Hugh Lewis, Ian MacDonald, John MacDonald, Sebastian Miguel, Kel Nagle (3), Jack Nicklaus (5), Christy O'Connor Snr, Frank Phillips, Gary Player (3), Phil Rodgers, Sewsunker Sewgolum, Ramón Sota, Peter Thomson (3), Brian Wilkes

2. The first 30 and those tying for 30th place in the P.G.A. Order of Merit for 1963