Susan O'Neill, is an Australian former competitive swimmer from Brisbane, Queensland, nicknamed "Madame Butterfly". She achieved eight Olympic Games medals during her swimming career.
Hayley Jane Lewis, OAM, is an Australian former competitive swimmer best known for winning five gold medals and one bronze medal at the 1990 Commonwealth Games as a 15-year-old.
Chad Guy Bertrand le Clos, OIS is a South African competitive swimmer who is an Olympic, World and Commonwealth Games champion. He is the African record, Commonwealth record, and South African record holder in the short course and long course 200-metre butterfly and the short course 100-metre butterfly. He also holds African and South African records in the long course 200-metre freestyle and 100-metre butterfly, as well as the short course 100-metre freestyle. Formerly, he was a world record holder in the short course 100-metre butterfly and 200-metre butterfly.
Emma Jennifer McKeon, is a retired Australian competitive swimmer. She is an eight-time world record holder, three current and five former, in relays. Her total career haul of 14 Olympic medals following the 2024 Olympic Games made her the most decorated Australian, the third-most decorated swimmer, and the seventh-most decorated athlete in Olympic history and included one gold medal from the 2016 Summer Olympics in Rio de Janeiro, four gold medals from the 2020 Summer Olympics in Tokyo and one gold medal from the 2024 Summer Olympics in Paris. With four gold and three bronze medals she was the most decorated athlete across all sports at the 2020 Summer Olympics, and tied for the most medals won by a woman in a single Olympic Games. She also won 20 medals, including five gold medals, at the World Aquatics Championships; and a record 20 medals, including 14 gold, at the Commonwealth Games.
Emily Beecroft is an Australian Paralympic swimmer. She represented Australia at the 2016 Rio Paralympics, 2020 Tokyo Paralympics and 2024 Paris Paralympics.
Paige Leonhardt is an Australian swimmer. She represented Australia at the 2016 Rio Paralympics, 2020 Tokyo Paralympics, where she won a silver medal and the 2024 Paris Paralympics.
Madeline Groves is an Australian competitive swimmer. She was the Australian national champion in the 200 m butterfly event in 2013, 2014, 2015 and 2016. At the 2014 Commonwealth Games she was a bronze medallist in the 200 m butterfly event, and swam in the heats for the gold medal-winning Australian freestyle relay team. She was selected to represent Australia in the 100 m and 200 m butterfly, and 4 × 200 m freestyle relay events at the 2016 Summer Olympics in Rio de Janeiro.
Alys Margaret Thomas is a British professional swimmer. She gained a gold medal and the 200m Butterfly Commonwealth games record in 2018.
Kaylee Rochelle McKeown is an Australian swimmer and quintuple Olympic gold medalist. She is the reigning Olympic champion in the 100 and 200 metres backstroke. She is the world record holder in the long course 50 metre backstroke, the short course 100 metre backstroke and both the long course and short course 200 metre backstroke. She won gold in both the 100 metre and 200 metre backstroke at both the 2020 and 2024 Olympics. In 2023, she was named as the "Best Female Swimmer of the Year" by World Aquatics, after sweeping gold in all three events of backstroke at all three World Cup legs, held in Berlin, Athens and Budapest in October, 2023.
Laura Kathleen Jane Stephens is a British swimmer. In 2024 she won the gold medal for the 200 metre butterfly at the 2024 World Aquatics Championships.
Jasmine Greenwood is an Australian Paralympic swimmer. At the 2020 Tokyo Paralympics, she won a silver medal in the 100 m butterfly S10 and competes at the 2024 Paris Paralympics..
Ruby Storm is an Australian Paralympic swimmer with an intellectual disability. She represented Australia at the 2019 World Para Swimming Championships, winning a bronze medal, and at the 2020 Tokyo Paralympics, she won a silver and bronze medal. At the 2024 Paris Paralympics, she won a silver medal.
Toni Stephanie Shaw is a British Paralympic swimmer. In 2019 she set the world record time for the S9 200m butterfly, and was also part of the team that set a new world record for the 4 × 100 m medley relay. At the 2020 Summer Paralympics, she won a bronze medal in the women's 400 metre freestyle S9 event and later went on to win gold at the 2022 World Para Swimming Championships, becoming the World Champion. She is a three-time World Champion and two-time European Champion.
Penny McCarthy is a New Zealand swimmer. She won the silver medal in the women's 100 metres butterfly representing her country at the 1978 Commonwealth Games in Edmonton, recording a time of 1:02.27, and finishing 0.35 s behind the winner, Wendy Quirk from Canada. She also competed in the 200 metres butterfly at those games, but finished ninth in the heats and did not progress further.
Australia 
