The swimming competitions at the 2004 Summer Olympics in Athens took place from 14 to 21 August 2004 at the Athens Olympic Aquatic Centre in Marousi. It featured 32 events, a total of 937 swimmers from 152 nations, and the program's changes instituted in the previous Games, including notably the three-phase format for all short-distance races.
The men's 200 metre freestyle event at the 2004 Summer Olympics was contested at the Olympic Aquatic Centre of the Athens Olympic Sports Complex in Athens, Greece. The event took place on 15 and 16 August. There were 59 competitors from 53 nations, with each nation having up to two swimmers.
The men's 4 × 100 metre freestyle relay took place on 15 August at the Olympic Aquatic Centre of the Athens Olympic Sports Complex in Athens, Greece.
The men's 100 metre butterfly event at the 2004 Olympic Games was contested at the Olympic Aquatic Centre of the Athens Olympic Sports Complex in Athens, Greece on August 19 and 20.
The men's 200 metre butterfly event at the 2004 Olympic Games was contested at the Olympic Aquatic Centre of the Athens Olympic Sports Complex in Athens, Greece on August 16 and 17.
The men's 200 metre individual medley event at the 2004 Olympic Games was contested at the Olympic Aquatic Centre of the Athens Olympic Sports Complex in Athens, Greece on August 18 and 19.
Erik K. Vendt is an American former competition swimmer. He won a silver medal at the 2000 Summer Olympics and the 2004 Summer Olympics in the 400-meter individual medley. At the 2008 Summer Olympics, Vendt won a gold medal as a member of the U.S. 4×200-meter freestyle relay team, swimming in the preliminary heats of the relay event.
Ryan Steven Lochte is an American former competition swimmer and 12-time Olympic medalist. He is the third-most decorated swimmer in Olympic history measured by total number of medals, behind only Michael Phelps and Katie Ledecky. 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.
Thiago Machado Vilela Pereira is a retired Brazilian international competition swimmer. One of the greatest swimmers in the history of Brazil, Pereira won the silver medal in the 400-meter individual medley at the 2012 Summer Olympics in London, beating the then-current Olympic champion Michael Phelps. He also broke a world record in the short course 200-meter individual medley, and broke several South American and Brazilian records. During his career, he competed with swimming legends Michael Phelps and Ryan Lochte.
The men's 4 × 200 metre freestyle relay event at the 2008 Olympic Games took place on 12–13 August at the Beijing National Aquatics Center in Beijing, China.
The men's 4 × 100 metre medley relay event at the 2008 Olympic Games took place on 15 and 17 August at the Beijing National Aquatics Center in Beijing, China.
The men's 200 metre freestyle event at the 2008 Olympic Games took place on 10–12 August at the Beijing National Aquatics Center in Beijing, China. There were 58 competitors from 50 nations. The winning margin was 1.89 seconds which as of 2023 remains the only time this race has been won by more than 1.8 seconds at the Olympics.
The men's 400 metre individual medley event at the 2008 Olympic Games took place on 9–10 August at the Beijing National Aquatics Center in Beijing, China.
Allison Rodgers Schmitt is an American competition swimmer who specializes in freestyle events. She is a four-time Olympian and a ten-time Olympic medalist.
David Walters, also known as Dave Walters, is an American former competition swimmer, Olympic gold medalist, and world record-holder in the 4x200 meter freestyler relay. At the 2008 Summer Olympics, Walters earned a gold medal by swimming in the heats of the 4×200-meter freestyle relay. As part of the American team, he also formerly held the world record in the 4×100-meter medley relay. Walters is also a seven-time medalist at the World Aquatics Championships.
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.
Jiro Miki is a Japanese former swimmer, who specialized in individual medley events. He is a two-time Olympian, a double Olympic finalist in both 200 and 400 m individual medley, and a silver medalist at the 2002 Asian Games in Busan, South Korea.
Guntars Deičmans is a Latvian former swimmer, who specialized in individual medley events. He is a 2004 Olympian, and a multiple-time Latvian champion and record holder in the same stroke.
Igor Andreyevich Berezutskiy is a Russian former swimmer, who specialized in freestyle and individual medley events. He is highly regarded as Russia's top medley swimmer in the 2000s, having won numerous national and junior European titles. He is a member of Volga Swimming Club, and is trained by his long-time coach and mentor Viktor Avdeyenko.
