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Gregory John Norman AO (born 10 February 1955) is an Australian entrepreneur and retired professional golfer who spent 331 weeks as the world's Number 1 Official World Golf Rankings ranked golfer in the 1980s and 1990s. He won 89 professional tournaments, including 20 PGA Tour tournaments and two majors: The Open Championships in 1986 and 1993. Norman also earned thirty top-10 finishes and was the runner-up 8 times in majors throughout his career. He was inducted into the World Golf Hall of Fame in 2001 with the highest percentage of votes (80%) of any golfer to date. In a reference to his blond hair, size, aggressive golf style and his birthplace's native coastal animal, Norman's nickname is "The Great White Shark" (often shortened to just "The Shark"), which he earned after his play at the 1981 Masters.

Norman's business interests began during his playing career. He is the chairman and CEO of the Greg Norman Company, a global corporation with a portfolio of companies in fields including apparel, interior design, real estate, wine production, private equity and golf course design.

Norman has donated to and established numerous charities and charity events, like the QBE Shootout which benefits the CureSearch for Children's Cancer fund. He became a Trustee of the Environmental Institute for Golf in 2004 and received the Golf Writers Association of America's Bartlett Award in 2008 for his charitable work.