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 backstroke 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. There were 36 competitors from 30 nations. Each nation had been limited to two swimmers in the event since 1984.
The Athens Olympic Aquatic Centre is a complex at the Athens Olympic Sports Complex in Marousi, Greece, consisting of two outdoor pools and one indoor pool, that was built for the 1991 Mediterranean Games. It was refurbished and expanded for the 2004 Summer Olympics. The larger of the outdoor pools, which seats 11,500 spectators, hosted swimming and water polo events. The smaller pool, which hosted synchronized swimming, sat 5,300 fans. The indoor pool, which hosted the diving events, sat 6,200 observers. It is used for swimming, too.
Cameroon competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.
Brenda Villa is an accomplished American water polo player. She is the most decorated athlete in the world of women’s water polo. Villa was named Female Water Polo Player of the Decade for 2000-2009 by the FINA Aquatics World Magazine. She is one of four female players who competed in water polo at four Olympics; and one of two female athletes who won four Olympic medals in water polo. She is a leading goalscorer in Olympic water polo history, with 31 goals. In 2018, she was inducted into the International Swimming Hall of Fame and the USA Water Polo Hall of Fame.
The 5th FINA World Swimming Championships were held at the Olympic Aquatic Centre in Athens, Greece from 16–19 March 2000. 15 world records were set.
Nicholas Sprenger is an Australian middle-distance freestyle swimmer who won a silver medal in the 4×200-metre freestyle relay at the 2004 Summer Olympics in Athens.
Thomas Rupprath is an Olympic swimmer from Germany, who is nicknamed "The New Albatross".
Silvia Bosurgi is a water polo forward from Italy, who won the gold medal with the Women's National Team at the 2004 Summer Olympics in Athens, Greece.
Solenne Figuès is a French swimmer.
Stavroula Kozompoli is a female Greek water polo player and Olympic silver medalist with the Greece women's national water polo team.
Antigoni Roumpesi or Antigoni Roumbesi is a Greek water polo player, World Aquatics gold champion and Olympic silver medalist with the Greece women's national water polo team.
Evangelia Moraitidou is a female Greek water polo player and Olympic silver medalist with the Greece women's national water polo team.
Georgia Lara is a female Greek water polo player and Olympic silver medalist with the Greece women's national water polo team.
César Augusto Aquino de Castro is a Brazilian competitive diver from Brasília, Distrito Federal. Castro has represented Brazil in four consecutive Olympics Summer Olympics, 2004 Summer Olympics in Athens Games, 2008 Summer Olympics in Beijing, 2012 Summer Olympics in London, and 2016 Summer Olympics in Rio de Janeiro.
Genai Kerr is an American water polo player. He is a member of the United States men's national water polo team and played in the 2004 Athens Olympics. Genai was a member of the United States Men's National Water Polo Team for 12 years and played in the 2004 Athens Olympics, 2003 & 2007 Pan American Gold medal games, and multiple World Championships. He is one of the only athletes in history to compete internationally as a goalie and as a field player. Most recently he was named MVP of the 2012 US Open after he helped Newport Water Polo Foundation win the national championship. Genai has coached at every level, from age group to Division 1 college programs. Over the last 15 years he has run hundreds of camps with Nike 5meter Water Polo Camps.
The 1997 FINA Men's Water Polo World Cup was the tenth edition of the event, organised by the world's governing body in aquatics, the International Swimming Federation (FINA). The event took place in Athens, Greece. Eight teams participated to decide the winner of what would be a bi-annual event until 1999.
The Women's 100m Freestyle event at the 11th FINA World Aquatics Championships was swum 28 – 29 July 2005 in Montreal, Quebec, Canada. Preliminary heats and Semifinal heats were 28 July; the final was 29 July.
The Men's 4x100 Medley Relay event at the 11th FINA World Aquatics Championships was swum on July 31, 2005 in Montreal, Quebec, Canada. 21 national teams swam in the Preliminary heats of the event in the morning; with the top-8 fastest teams advancing to swim again in the Final that evening.
The Women's 4x100 Medley Relay event at the 11th FINA World Aquatics Championships swam on 30 July 2005 in Montreal, Canada.
Canada 
China 
Australia 
Germany 
Great Britain 
Russia 
United States 
Japan 