Paul Alexander Casey (born 21 July 1977) is an English golfer who is a member of the world's top two professional golf tours, the U.S.-based PGA Tour and the European Tour. In 2009 he achieved his highest position, third, in the Official World Golf Rankings.
Casey was born in Cheltenham, but moved with his family to Weybridge, Surrey at the age of six. After attending Cleves School, Weybridge and then Hampton School, he studied A levels at Strode's College, Egham. He then took a golf scholarship at Arizona State University.
His amateur career was distinguished. In the U.S. he was the first man to win three consecutive Pac-10 Championships (1998, 1999 and 2000). In 2000 he broke the championship scoring record held by Tiger Woods (18 under par) with a 23 under par 265. Back on the other side of the Atlantic he won the English Amateur in 1999 and 2000. He was also a member of Great Britain and Ireland's winning 1999 Walker Cup team, where he was only the third player in seventy seven years to record four victories without a single defeat.