Theodore Ernest "Ernie" Els (/ˈɛls/; born 17 October 1969) is a South African professional golfer, who has been one of the top professional players in the world since the mid-1990s. A former World No. 1, he is known as "The Big Easy" due to his imposing physical stature (he stands 1.91 metres [6 feet, 3 inches]) along with his fluid, seemingly effortless golf swing. Among his numerous victories are three major championships: the U.S. Open in 1994 at the Oakmont Country Club and 1997 at the Congressional Country Club, and The Open Championship in 2002 at Muirfield.

Other highlights in Els' career include topping the 2003 and 2004 European Tour Order of Merit (money list), and winning the World Match Play Championship a record seven times. He was the leading career money winner on the European Tour until overtaken by Lee Westwood in 2011, and was the first member of the tour to earn over 25 million Euros from European Tour events. He has held the number one spot in the Official World Golf Rankings and holds the record for weeks ranked in the top ten with over 780. Els was elected to the World Golf Hall of Fame in 2010, on his first time on the ballot, and was inducted in May 2011.