László Cseh is a retired Hungarian competitive swimmer and six-time Olympic medalist. He is a 33-time European Champion. His father, László Cseh Sr., also represented Hungary at the Olympics in swimming. In 2020 Braden Keith of SwimSwam nominated him as number 1 within top 10 male swimmers who have never won Olympic gold.
Thomas Fitzgerald Dolan is an American former competition swimmer, two-time Olympic champion, and former world record-holder.
Ryan Steven Lochte is an American professional swimmer and 12-time Olympic medalist. Along with Natalie Coughlin, Dara Torres, and Jenny Thompson, he is the second-most decorated swimmer in Olympic history measured by total number of medals, behind only Michael Phelps. Lochte's seven individual Olympic medals rank second in history in men's swimming, tied for second among all Olympic swimmers. He currently holds the world records in the 200-meter individual medley. As part of the American teams, he also holds the world record in the 4×200-meter freestyle and 4×100-meter freestyle (mixed) relay.
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.
Alexander Timothy McKee is an American former competition swimmer and three-time Olympic silver medalist. He was a successful medley and backstroke swimmer, and is often remembered for being a part of the closest Olympic swimming finish in history and the resulting rule changes regarding the timing of international swimming events.
David Lee "Dave" Wharton is an American former competition swimmer, 1988 Olympic silver medalist, and former world record-holder in two events. During his competition swimming career, Wharton set world records in both the 200-meter and 400-meter individual medley events.
Michael Fred Phelps II is an American former competitive swimmer. He is the most successful and most decorated Olympian of all time with a total of 28 medals. Phelps also holds the all-time records for Olympic gold medals (23), Olympic gold medals in individual events (13), and Olympic medals in individual events (16). At the 2004 Summer Olympics in Athens, Phelps tied the record of eight medals of any color at a single Games, held by gymnast Alexander Dityatin, by winning six gold and two bronze medals. Four years later, when he won eight gold medals at the 2008 Beijing Games, he broke fellow American swimmer Mark Spitz's 1972 record of seven first-place finishes at any single Olympic Games. At the 2012 Summer Olympics in London, Phelps won four gold and two silver medals, and at the 2016 Summer Olympics in Rio de Janeiro, he won five gold medals and one silver. This made him the most successful athlete of the Games for the fourth Olympics in a row.
Scott Tyler Clary is an American former competition swimmer and Olympic gold medalist. In his Olympic debut at the 2012 Summer Olympics, Clary won gold in the 200-meter backstroke in Olympic record time. In total, he won sixteen medals in major international competitions: three gold, eight silver, and five bronze spanning the Summer Olympics, the FINA World Championships, the Pan Pacific Championships, and the Pan American Games.
Thomas William Fraser-Holmes is an Australian swimmer who made his international debut in 2010. He was an Australian Institute of Sport scholarship holder.
Ye Shiwen is a Chinese swimmer. At the 2012 Summer Olympics, she won gold medals in the 400 metres and 200 metres individual medley, breaking the world record in the 400 m event and the Olympic record in the 200 m event.
Macedonia, under the name of Former Yugoslav Republic of Macedonia, competed at the 2012 Summer Olympics in London, United Kingdom, held from 27 July to 12 August 2012. This was the nation's fifth consecutive appearance at the Summer Olympics in the post-Yugoslav era.
Joseph Peter "Joe" Roebuck is an English swimmer.
Kosuke Hagino is a Japanese former competitive swimmer who specialized in the individual medley and 200 m freestyle. He is a four-time Olympic medalist, most notably winning gold in the 400 m individual medley at the 2016 Summer Olympics.
Roberto Pavoni is an English former competitive swimmer who represented Great Britain in various international championships. At the 2012 Summer Olympics in London, he finished 13th overall in the heats in the Men's 400 metre individual medley and failed to reach the final. He also competed in the 200m butterfly, again failing to reach the final.
Pedro Miguel Pinotes is an Angolan swimmer who competes in the Men's 400m individual medley. At the 2012 Summer Olympics he finished 30th overall in the heats in the Men's 400 metre individual medley and failed to reach the semi-final. At the 2016 Summer Olympics in Rio de Janeiro, he competed in the men's 400 m individual medley. He finished 25th in the heats and did not advance to the semi-final.
Wang Shun is a Chinese competitive swimmer. A versatile medley swimmer, he became the first Asian male swimmer to win a gold medal at the men's 200m individual medley at the Olympic Games when he came in first at the 2020 Summer Olympics men's 200 metre individual medley. He is also the first swimmer from China to win a gold medal in an Olympic men's medley swimming event. He had earlier won a bronze medal in the same event at the 2016 Summer Olympics.
Dmytro Valeriyovych Nazarenko is a Ukrainian-born Turkish former swimmer, who specialized in individual medley events. He is a fifth-place finalist in the 400 m individual medley at the 2002 European Short Course Swimming Championships in Riesa, Germany (4:12.07).
Chase Tyler Kalisz is an American swimmer who specializes in individual medley events. He is an Olympic gold medalist in the 400-meter individual medley at the 2020 Summer Olympics in Tokyo, an Olympic silver medalist at the 2016 Summer Olympics in Rio de Janeiro and a two-time World Aquatics Championships gold medalist.
Andrew Hammond Seliskar is a retired American competitive swimmer. He won the gold medal in the 200 meter butterfly at the 2013 FINA World Junior Swimming Championships in Dubai, breaking the Championships record.
Travis Mahoney is an Australian medley and backstroke swimmer. Winner of two relay medals at the 2012 World Short Course Championships, he is also part of the quartet that broke the world record in the short course mixed 4 × 50 metres freestyle relay. In 2016, he qualified for his first Olympic Games.
North Macedonia 
