Chad Guy Bertrand le Clos OIS, (born 12 April 1992) is a South African competitive swimmer who is an Olympic, World and Commonwealth Games champion as well as the Commonwealth record holder in the 50 and 100-metre butterfly. He won gold in the 200-metre butterfly and silver in the 100-metre butterfly in the 2012 Olympics in London, as well as silver medals in the 200-metre freestyle and 100-metre butterfly in the 2016 Summer Olympics. He also won five medals at the 2010 Summer Youth Olympics in Singapore. Le Clos has won the Overall Swimming World Cup three times: 2011, 2013 and 2014.
Le Clos was named SwimSwam's 2014 Swammy Award-winner for Male Swimmer of the Year.
Le Clos was born to a Mauritian father of French descent and a South African mother. He attended Westville Boys' High School in Durban, South Africa, matriculating in 2010. He has been swimming from a very young age, and when he started competing at the age of 8 he already had a few years of training under his belt.