Leisel Marie Jones OAM (born 30 August 1985 in Katherine) is an Australian swimmer. 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 x 100 metre Medley Relay at the Athens Games in 2004.
She is noted for employing a classical breastroke technique, typified by a slow, but deeper stroke cycle, and also by her slow starts - she is consistently the last swimmer to enter the water and emerge from it after the underwater dive.