Leisel Marie Jones, OAM (born 30 August 1985) is an Australian former competition swimmer and Olympic gold medallist. A participant in the 2000 Summer Olympics – at just 15 years old – and 2004 Summer Olympics, she was part of gold medal winning Australian team in the women's 4 × 100 metre medley relay at the Athens Games in 2004 and a gold medalist for 100 meter breaststroke in the 2008 Summer Olympics in Beijing.