Federica Pellegrini is an Italian retired swimmer. A native of Mirano, in the province of Venice, she won a gold medal at the 2008 Beijing Olympics. At the 2009 World Championships in Rome, Pellegrini became the first woman ever to break the 4-minute barrier in the 400 m freestyle with a time of 3:59.15. She also held the women's 200 meters freestyle world record.
Natalie du Toit OIG MBE is a South African swimmer. She is best known for the gold medals she won at the 2004 Paralympic Games as well as the Commonwealth Games. She was one of two Paralympians to compete at the 2008 Summer Olympics in Beijing; the other being table tennis player Natalia Partyka. Du Toit became the third amputee ever to qualify for the Olympics, where she placed 16th in the 10km swim.
Cassandra ("Cassie") Lily Patten is a British freestyle swimmer and coach who won the bronze in the 10km open-water event at the 2008 Beijing Olympics.
Quah Ting Wen is a Singaporean professional swimmer who specialises in butterfly, freestyle and individual medley events. She is currently representing DC Trident at the International Swimming League.
Cheong Jun Hoong is a retired Malaysian diver. She won a silver medal in the synchronised 10m platform event with Pandelela Rinong at the 2016 Summer Olympics. At the 2017 World Aquatics Championships, she became Malaysia's first diving world champion after winning the 10m platform event.
Maddison Gae Elliott, is an Australian swimmer. At the 2012 Summer Paralympics in London, she became the youngest Australian Paralympic medallist by winning bronze medals in the women's 400 m and 100 m freestyle S8 events. She then became the youngest Australian gold medallist when she was a member of the women's 4 × 100 m freestyle relay 34 points team. At the 2016 Rio Paralympics, she won three gold and two silver medals.
Daniel William Henry "Danny" Wong Bego, OLY is a Malaysian swimmer, who specialises in freestyle and butterfly events. He emerged as one of Malaysia's most promising and outstanding swimmers, winning a total of fifteen medals at the Southeast Asian Games, and breaking six national records. He was the first Malaysian swimmer to compete in three different events at a single Olympic Games.
Richard Sam Bera is a former Indonesian swimmer, who specialized in sprint and middle-distance freestyle events. He is a three-time Olympian, a bronze medalist at the Asian Games (1990), and a twenty-three times SEA Games gold-medalist since his debut in 1987. He is regarded as Indonesia's most successful swimmer in the sporting history. Up until 2015, Bera held several Indonesian and Southeast Asian Games records in sprint freestyle events from the Southeast Asian Games.
Ashley Grace Twichell is an American competition swimmer who specializes in long-distance freestyle and open-water events. She placed seventh in the 10 kilometer open water swim at the 2020 Summer Olympics. Twichell's age at her Olympic Games debut, 32 years of age, made her the oldest American swimmer first-timer at an Olympic Games since 1908.
Marina Chan is a Singaporean freestyle and butterfly swimmer. Hailing from a prominent swimming family, Chan only took up the sport in her first year of high school. She has represented her country at the FINA World Cup, Asian Games, Asian Swimming Championships, Commonwealth Games, Youth Olympic Games and the Asian Youth Games with her aim win a gold medal at the 2020 Olympic Games in Tokyo.
Lakeisha Dawn Patterson, is an Australian Paralympic swimmer. She won medals at the 2014 Commonwealth Games and 2015 IPC Swimming World Championships. At the 2016 Rio Paralympics, she won Australia's first gold medal of the Games in a world record time swim in the Women's 400m freestyle S8. At the 2020 Tokyo Paralympics, she won the gold medal in the Women's 400 m Freestyle S9.
Taylor Madison Ruck is a Canadian competitive swimmer. She won two Olympic bronze medals as part of Canada's women's 4×100 metre and 4×200 metre freestyle relay teams at the 2016 Summer Olympics in Rio de Janeiro. Ruck won eight medals at the 2018 Commonwealth Games in Gold Coast, Australia. Her eight medal performance of one gold, five silver, and two bronze tied her with three other athletes for the most all-time at a single Commonwealth Games, as well as making her the most decorated Canadian female athlete ever at a single Commonwealth Games. Ruck is the all-time leading medallist at the FINA World Junior Swimming Championships having won nine gold, two silver, and two bronze over the course of the 2015 and 2017 editions.
Rikako Ikee is a Japanese competitive swimmer. She is the national record holder in the 50-meter freestyle and the 100-meter butterfly, and the junior world record holder in the 50-meter freestyle and 50-meter butterfly long-course events, and the 50- and 100-meter butterfly, and 100-meter individual medley in short course.
Katja Dedekind is an Australian Paralympic vision-impaired swimmer and goalball player. She won a bronze medal at the 2016 Rio Paralympic Games and two bronze medals at the 2020 Tokyo Paralympic Games.
Molly Tay is a Singaporean former swimmer. She competed in the women's 100 metre butterfly at the 1964 Summer Olympics. Tay competed at the 1964 Summer Olympics under the Malaysia flag. She failed to qualify from her heats.
Tay Chin Joo is a Singaporean former national swimmer. She competed in the women's 100 metre butterfly at the 1972 Summer Olympics.
Mary-Sophie Harvey is a Canadian swimmer who competed as part of Team Canada at the 2020 Summer Olympics in Tokyo.
Kayla Noelle Sanchez is a Filipino-Canadian swimmer. A member of the Canadian national team until 2022, she has represented Canada at the Olympic and World championship level, and is a two-time Olympic medalist. She is one of Canada's most prominent Filipino Canadian athletes.
Hannah Margaret McNair "Maggie" Mac Neil is a Canadian competitive swimmer. A 100 metre butterfly event specialist, she is the 2020 Olympic champion, 2019 World (LC) champion, two-time World (SC) champion, 2022 Commonwealth champion, and 2023 Pan American champion. She holds the current Americas record (55.59s), the short course world record, the Commonwealth record, and Pan American record in the event.
The swimming competitions at the 2023 SEA Games took place at Morodok Techo National Aquatics Center in Phnom Penh from 6 to 11 May 2023.
Malaysia 
