Australia competed at the 2004 Summer Olympics in Athens, Greece from 13 to 29 August 2004. Australian athletes have competed in every Summer Olympic Games of the modern era. The Australian Olympic Committee sent a total of 470 athletes to the Games to compete in 29 sports.
Italy competed at the 2004 Summer Olympics in Athens, Greece, from the 13th to the 29th of August 2004. The country has competed at every Summer Olympic games in the modern era, except for the 1904 Summer Olympics in St. Louis. The Italian National Olympic Committee sent the nation's largest ever delegation in history to the Games. A total of 364 athletes, 229 men and 135 women, competed in 27 sports.
Hungary competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. Hungarian athletes have competed at every Summer Olympic Games in the modern era, except the 1920 Summer Olympics in Antwerp, and the 1984 Summer Olympics in Los Angeles because of the Soviet boycott. The Hungarian Olympic Committee sent a total of 209 athletes to the Games, 119 men and 90 women, to compete in 20 sports. Water polo and handball were the only team-based sports in which Hungary had its representation in these Olympic Games. There was only a single competitor in road cycling and mountain biking.
The water polo tournament at the 1996 Summer Olympics was held from 20 to 28 July 1996, in Atlanta, United States.
Water polo has been part of the Summer Olympics program since the second games, in 1900. A women's water polo tournament was introduced for the 2000 Summer Olympics. Hungary has been the most successful country in men's tournament, while the United States is the only team to win multiple times at the women's tournament since its introduction. Italy is the first and only country to win both the men's and women's water polo tournaments.
The United States, represented by the United States Olympic Committee (USOC), competed at the 2008 Summer Olympics in Beijing, China. U.S. athletes have competed in every Summer Olympic Games in the modern era, except the 1980 Summer Olympics in Moscow, which was boycotted by the US team and many others in protest of the Soviet invasion of Afghanistan. The USOC sent a total of 588 athletes to Beijing, and competed in all Olympic sports except handball.
The 1999 FINA Women's Water Polo World Cup was the twelfth edition of the event, organised by the International Swimming Federation (FINA). The event took place in Winnipeg, Manitoba, Canada from May 24 to May 29, 1999. Participating teams were the eight leading teams from the World Championships. The tournament served as a qualifier for the 2000 Summer Olympics in Sydney, Australia. Automatically the first ranked teams from Europe and the Americas, plus one team from the host country, qualified. Other teams could qualify at the 2000 Olympic Games Qualifying Tournament, held from April 22 to April 30 in Palermo, Italy.
The 2004 Men's Olympic Water Polo Qualifying Tournament was a tournament to decide the remaining three competing teams at the 2004 Summer Olympics in Athens, Greece.
The 2008 Women's Olympic Water Polo Qualifying Tournament was a tournament to decide the remaining four competing teams at the 2008 Summer Olympics in Beijing, PR China. Four teams were already qualified: Australia, China, the Netherlands and the United States. The tournament was held at the new Olympic Swimming Pool (2005) in Imperia, Italy from February 17 to February 24, 2008 with twelve competing teams.
The women's water polo tournament at the 2004 Summer Olympics was contested between August 16 and August 26 at the Olympic Aquatic Centre in the Athens Olympic Sports Complex. Eight teams qualified for the Games, with Italy defeating the host nation Greece for the gold medal. The United States won the bronze medal.
The women's water polo tournament at the 2000 Summer Olympics in Sydney, Australia, was held from 16 to 30 September 2000, with six teams competing in the debut tournament. The games were held at the Ryde Aquatic Centre and the Sydney Olympic Aquatic Centre. It was the first time in history that women's water polo officially competed at the Summer Olympics.
The United States, represented by the United States Olympic Committee (USOC), competed at the 2016 Summer Olympics in Rio de Janeiro, from August 5 to 21, 2016. U.S. athletes have appeared in every Summer Olympics of the modern era, with the exception of the 1980 Summer Olympics in Moscow, which they boycotted. For the second consecutive time in the Summer Olympics, the United States was represented by more female than male athletes.
Croatia competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's seventh consecutive appearance at the Summer Olympics. The Croatian Olympic Committee confirmed a roster of 87 athletes, 68 men and 19 women, to compete across 18 sports at the Games.
The 2016 Women's Water Polo Olympic Qualification Tournament was held at the Groenhovenbad in Gouda, Netherlands, from 21 to 28 March 2016. The top four teams advanced to the Olympics. The mascot of the event was an orange lion in blue clothes called Swimba.
Canada 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, because of the COVID-19 pandemic. Since the nation's debut in 1900, Canadian athletes have appeared in every edition of the Summer Olympic Games, with the exception of the 1980 Summer Olympics in Moscow because of the country's support for United States-led boycott.
Australia 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, because of the COVID-19 pandemic. Australia is one of only five countries to have sent athletes to every Summer Olympics of the modern era, alongside Great Britain, France, Greece, and Switzerland.
The Netherlands 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, because of the COVID-19 pandemic. Since the nation's official debut in 1900, Dutch athletes have competed at every edition of the Summer Olympic Games, with the exception of the 1904 Summer Olympics in St. Louis and 1956 Summer Olympics in Melbourne, which the Netherlands boycotted because of the Soviet invasion of Hungary.
This article presents the national team appearances in the men's Olympic water polo tournament since the inaugural official edition in 1900.
This article presents the national team appearances in the women's Olympic water polo tournament since the inaugural official edition in 2000.
Italy 
Greece 
Germany 
United States 
Kazakhstan 
Czech Republic 
Hungary 
Spain 
France 
Russia 
Brazil 
Japan 
Great Britain 
