Lodewicus Theodorus "Louis" Oosthuizen (born October 19, 1982) is a PGA Tour golfer. He is from South Africa. He is currently leading the Deutsche Bank championship. He won the 2010 Open Championship and was runner-up in the 2012 Masters Tournament.
He won many amateur titles before turning professional in 2002 at the age of 19. In March 2010, he won his first European Tour event at the Open de Andalucia de Golf. He also won the 2010 Masters Par 3 Contest.
- "Louis Oosthuizen seals maiden Tour win in Andalucia". BBC Sport. 28 March 2010. http://news.bbc.co.uk/sport2/hi/golf/8591846.stm. Retrieved 30 March 2010.
- "Oosthuizen wins Augusta Par-3 contest". United Press International. 7 April 2010. http://www.upi.com/Sports_News/2010/04/07/Oosthuizen-wins-Augusta-Par-3-contest/UPI-28001270685132/. Retrieved 26 July 2010.