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 the African records and South African records in the long course 200-metre freestyle and 100-metre butterfly, and the short course 100-metre freestyle. Formerly, he was a world record holder in the short course 100-metre butterfly and 200-metre butterfly.
Bronte Campbell is a Malawian-born Australian competitive swimmer, a dual Olympic gold-medal winner and world champion. Her older sister, Cate, is also a competitive swimmer, and once held world records in both the short and long course 100 metre individual freestyle events. Bronte and Cate are the first Australian siblings on the same Olympic swimming team since the 1972 Olympics and the first Australian sisters ever to compete within the same swimming event at the Olympics. Bronte Campbell won three gold medals at the 2015 World Championships, including the 50 and 100 metre freestyle events.
Emma Jennifer McKeon, is an Australian competitive swimmer. She is an eight-time world record holder, three current and five former, in relays. Her total career haul of 11 Olympic medals following the 2020 Olympic Games made her Australia's most decorated Olympian and included one gold medal from the 2016 Summer Olympics in Rio de Janeiro and four gold medals from the 2020 Summer Olympics in Tokyo. 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 has 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 and the 2020 Tokyo Paralympics. She won a silver and bronze medal at the 2020 Tokyo Paralympics.
Tanzania competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Seven athletes, five men and two women, competed in five events across three sports, but did not win any medals. Hilal Hemed Hilal, however, set a new national record in the men's 50 m freestyle event. Four athletes took part in track and field athletics, all in marathons, while two participated in the swimming tournament's 50 m freestyle category. The flagbearer for the opening ceremony was Andrew Thomas Mlugu, who was Tanzania's first Olympic judoka. His counterpart in the closing ceremony was Alphonce Felix Simbu, who had earned the nation's best finish at the Games by placing fifth in the men's marathon. Prior to these Games, Tanzania had sent athletes to twelve editions of the Summer Olympics.
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.
Evgeny Mikhailovich Rylov is a Russian competitive swimmer and Olympic champion specializing in backstroke events. He won three gold medals at the 2014 Summer Youth Olympics in Nanjing, and a bronze medal at his senior international debut at the 2015 World Championships in Kazan. He also won a bronze medal at the 2016 Summer Olympics in Rio de Janeiro and a gold medal at the 2017 World Championships in Budapest, both were in the 200 metre backstroke event. In 2018, at the 2018 World Short Course Championships, he won gold medals in the 200 metre backstroke and 50 metre backstroke. At the 2019 World Championships, he won a gold medal in the 200 metre backstroke, silver medal in the 100 metre backstroke, and silver medal in the 50 metre backstroke. He won the gold medal in the 100 metre backstroke and 200 metre backstroke at the 2020 Summer Olympics in Tokyo.
Kyle Chalmers, is an Australian competitive swimmer. He is a world record holder in the short course 100 metre freestyle, 4×100 metre medley relay, and long course 4×100 metre mixed freestyle relay. He is the Oceanian and Australian record holder in the short course 50 metre butterfly and 50 metre freestyle.
Braedan Jason is an Australian Paralympic swimmer. He represented Australia at the 2016 Rio Paralympics and the 2020 Tokyo Paralympics.
Corey Charles Garth Main is a New Zealand swimmer who qualified to compete at the 2016 Summer Olympics to be held in Rio de Janeiro, Brazil, in the men's 100 metre backstroke.
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.
Abeiku Gyekye Jackson is a Ghanaian swimmer specialising in the 50 metre freestyle. He competed in the 100m freestyle, 50m butterfly, and 100m butterfly at the 2014 Commonwealth Games. He holds Ghanaian national records in 13 disciplines, including freestyle, butterfly, breaststroke and backstroke events over distances from 50 to 400 metres. His older brother Kwesi Abbiw Jackson and younger brother Kow Asafua Jackson are also swimmers.
Brandon Schuster is a Samoan swimmer who represented Samoa at the 2016 Summer Olympics. He holds multiple Samoan records in swimming.
Igor Araujo Mogne is a Mozambican competitive swimmer. He competed at the 2016 Summer Olympics in Rio de Janeiro, in the men's 100 metre freestyle.
Peter Wetzlar is a Zimbabwean swimmer. He attended Westville Boys' High School in Durban, South Africa and the University of Kentucky. He competed in the men's 100 metre freestyle event at the 2017 World Aquatics Championships.
Stefano Mitchell is a Antigua and Barbuda swimmer. He competed in the men's 50 metre butterfly event at the 2017 World Aquatics Championships. In 2019, he represented Antigua and Barbuda at the 2019 World Aquatics Championships held in Gwangju, South Korea and he finished in 62nd place in the heats in the men's 50 metre freestyle event.
Emma Chelius is a South African swimmer.
Thomas William Darnton Dean is a British competitive freestyle swimmer. He is a double Olympic gold medalist, winning gold individually in 200 metre freestyle and as part of a team in 4 × 200 m freestyle relay at the 2020 Summer Olympics.
Michael Houlie is a South African swimmer. He competed in the men's 100 metre breaststroke at the 2019 World Aquatics Championships. In 2019, he represented South Africa at the 2019 African Games held in Rabat, Morocco. He also competed in the men's 100 metre breaststroke event at the 2020 Summer Olympics.
The Marshall Islands competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, due to the COVID-19 pandemic. It was the nation's fourth appearance at the Summer Olympics since its debut in 2008. The delegation consisted of two athletes, one man and one women, competing in two events in swimming. Swimmer Phillip Kinono competed in the men's 50 metre freestyle. Colleen Furgeson, a returning competitor from the 2016 Rio Olympics competed in the women's 100 metre freestyle. For the first time, in an effort to promote gender equality, two flagbearers, one male and one female were allowed at the Olympics. Furgeson and Kinono lead the Marshall Islands squad as the flagbearers in the opening ceremony. The Marshall Islands, however, has yet to win its first ever Olympic medal.
Rwanda 
