Malin Therese Alshammar is a Swedish swimmer who has won three Olympic medals, 25 World Championship medals, and 43 European Championship medals. She is a specialist in short distances races in freestyle and butterfly. She is coached by former Swedish swimmer Johan Wallberg. She is the first female swimmer and the third overall to participate in six Olympic Games.
Oussama "Ous" Mellouli is a Tunisian swimmer who competes in the freestyle and medley events. He is a three-time Olympic medalist, is an African record holder, and trains with the USC Trojans team based at the University of Southern California, where he studied as a computer science undergraduate and swam collegiately.
Éva Risztov is a Hungarian Olympic gold medalist female swimmer.
Mireia Belmonte García is a Spanish Olympic, world, and European champion swimmer. She is the world record holder in the short course 200 metre butterfly and 400 metre individual medley. Formerly, she held the world record in the short course 400 metre freestyle, 800 metre freestyle, and 1500 metre freestyle. She was the first Spanish woman to win a gold medal in swimming at an Olympic Games and is widely considered to be the greatest Spanish swimmer of all time.
Poliana Okimoto is a Brazilian long-distance swimmer.
Savannah King is a Canadian former competition swimmer who competed primarily in freestyle events. She claimed a bronze medal in the 800-metre freestyle at the 2007 Pan American Games in Rio de Janeiro, Brazil. She also won a silver medal in the 4x200-metre freestyle relay by participating in the preliminary heats.
Haley Danita Anderson is an American competitive swimmer who is an Olympic silver medalist. She placed second in the 10-kilometer open water event at the 2012 Summer Olympics.
The swimming competitions at the 2012 Summer Olympics in London took place from 28 July to 4 August at the Aquatics Centre. The open-water competition took place from 9 to 10 August in Hyde Park.
The women's marathon swimming over a distance of 10 kilometres at the 2012 Olympic Games in London took place on 9 August in the Serpentine at Hyde Park in London, United Kingdom.
Katerine Savard is a Canadian competitive swimmer who specializes in women's butterfly events and freestyle relay. She holds several Canadian national records in the butterfly over the 50-, 100-, and 200-metre distances in both the short and long courses. Savard also holds the Canadian junior butterfly record in the 200-metre event. She won the gold medal at the 100-metre butterfly event at the 2013 Summer Universiade, held in Kazan. Savard also won gold at the 2014 Commonwealth Games in the 100-metre butterfly in Glasgow, where she set the Commonwealth record in the process. At the same games, she won a bronze medal as a member of the women's 4×100-metre medley relay team.
Brittany MacLean is a Canadian retired competitive swimmer who has represented her country in the Summer Olympics and other international championships. She won a bronze medal in the women's 4 x 200 m freestyle relay at the 2016 Summer Olympics.
Richard Weinberger is a Canadian long-distance swimmer. Weinberger won a bronze medal at the 2012 Summer Olympics in London in the 10-kilometre open water marathon. He is the 2011 Pan American Games champion and also has a bronze medal from the 2010 Pan Pacific Swimming Championships.
Allan Lopes Mamédio do Carmo is a Brazilian swimmer, who specialized in open water marathon. He is considered one of the fastest professional open water swimmers in the world, finishing near the top of FINA World Cup races for the 10 km marathon. He also won a bronze medal for his category at the 2007 Pan American Games in Rio de Janeiro.
Ana Marcela Jesus Soares da Cunha is a Brazilian swimmer who specializes in the open water swimming marathon. She is considered one of the best open water swimmers in history, having obtained 17 medals in FINA World Aquatics Championships. She has also received FINA’s Female World Open Water Swimmer Of The Year award six times. Her countless achievements are comparable only to those of Larisa Ilchenko, another multi-medalist in World Championships.
Aurélie Muller is a French swimmer, who specializes in long-distance freestyle events and open water marathon. She won the 10-kilometer competition at the 2015 world championship in Kazan, Russia and at the 2017 world championship in Budapest, Hungary.
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.
Hungary competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Hungarian athletes have appeared in every edition of the Summer Olympic Games, except for two occasions. Hungary was not invited to the 1920 Summer Olympics in Antwerp, because of its role in the first World War, and it was also part of the Soviet boycott, when Los Angeles hosted the 1984 Summer Olympics.
The women's marathon swimming over a distance of 10 kilometres at the 2016 Summer Olympics in Rio de Janeiro took place on 15 August at Fort Copacabana.
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.
The men's marathon 10 kilometre event at the 2020 Summer Olympics was held on 5 August 2021 at the Odaiba Marine Park. It was the fourth appearance of the event, having first been held in 2008.
Canada 
