Greece was the host country for the 2004 Summer Olympics in Athens, from 13 to 29 August 2004. As the progenitor nation and in keeping with tradition, Greek athletes have competed at every Summer Olympics in the modern era, alongside Australia, Great Britain, and Switzerland. The Hellenic Olympic Committee fielded a total of 426 athletes to the Games, 215 men and 211 women, and had achieved automatic qualification places in all sports, with the exception of men's and women's field hockey. It was also the nation's largest team ever in Summer Olympic history since the first modern Games were held in 1896.
Final results for the water polo tournament at the 1952 Summer Olympics.
Basketball at the 2016 Summer Olympics was the nineteenth appearance of the sport of basketball as an official Olympic medal event. It took place at Rio de Janeiro, Brazil, and was held from 6 August to 21 August 2016. The preliminary and knockout round matches for men were played inside the Carioca Arena 1 in Olympic Park which seated up to 16,000 spectators. The matches for women were played at the Youth Arena. This marked the first time that the men's and women's Olympic tournaments were played in multiple/separate venues.
Field hockey at the 2016 Summer Olympics in Rio de Janeiro took place from 6 to 19 August at the Olympic Hockey Centre in Deodoro. The competition had instituted several changes in the format and structure from the 2012 Summer Olympics. Twenty-four teams competed in the tournament.
The handball tournaments at the 2016 Summer Olympics in Rio de Janeiro was held from 6 to 21 August at the Future Arena in the Barra Olympic Park. The tournaments were won by Denmark in the men's competition and Russia for the women's tournament. The French teams for both competitions finished with the silver medal, and the bronze went to Germany and Norway, respectively.
The water polo tournaments at the 2020 Summer Olympics took place at the Tokyo Tatsumi International Swimming Center in Kōtō. Twenty-two teams competed in the tournament, an increase of two from the previous editions. Men's Water polo was also the last final played before the closing ceremony.
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.
Spain, represented by the Spanish Olympic Committee (COE), competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Since the nation's official debut in 1920, Spanish athletes have appeared in every edition of the Summer Olympic Games except for two; the 1936 Summer Olympics in Nazi Germany, and the 1956 Summer Olympics in Melbourne, as a protest against the Soviet invasion of Hungary. The Spanish Olympic Committee sent a total of 306 athletes, 163 men and 143 women, to compete in 25 sports.
The men's tournament of Water polo at the 2016 Summer Olympics at Rio de Janeiro, Brazil, began on 6 August and ended on 20 August 2016. Games were held at the Maria Lenk Aquatics Centre and the Olympic Aquatics Stadium.
The women's tournament of Water polo at the 2016 Summer Olympics at Rio de Janeiro, Brazil, began on 9 August and ended on 19 August 2016. Games were held at the Maria Lenk Aquatics Centre and the Olympic Aquatics Stadium.
The women's water polo tournament at the 2015 World Aquatics Championships, organised by the FINA, was held in Kazan, Russia from 26 July to 7 August 2015.
Montenegro competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's third consecutive appearance at the Summer Olympics since it gained independence from Serbia in 2006.
The men's tournament of water polo at the 2020 Summer Olympics at Tokyo, Japan began on 25 July and ended on 8 August 2021. It was held at the Tokyo Tatsumi International Swimming Center. It was the 27th official appearance of the tournament, which was not held in 1896 and was a demonstration sport in 1904 but otherwise had been held at every Olympics.
The women's tournament of water polo at the 2020 Summer Olympics at Tokyo, Japan was played from 24 July to 7 August 2021 at the Tokyo Tatsumi International Swimming Center. It was the sixth appearance of the women's tournament, which had been held consecutively since 2000 and also was the first time on history that the tournament had 10 teams competing.
The men's tournament of water polo at the 2019 Pan American Games in Lima, Peru took place between 4 and 10 August at the Villa María del Triunfo cluster. The winner of the competition qualifies directly for the 2020 Summer Olympics in Tokyo, Japan, while the second through fourth-place finishing teams qualified for the 2020 Men's Water Polo Olympic Qualification Tournament.
The 2022 Men's European Water Polo Championship was the 35th running of the tournament. It was held in the Spaladium Arena in Split, Croatia from 29 August to 10 September 2022.
The 2022 Women's European Water Polo Championship was the 19th running of the tournament. It was held in the Spaladium Arena in Split, Croatia from 27 August to 10 September 2022.
The men's tournament of water polo at the 2024 Summer Olympics in Paris, France was held from 28 July to 11 August 2024 at the Paris Aquatic Centre and Paris La Défense Arena. It was the 28th official appearance of the tournament, which was not held in 1896 and was a demonstration sport in 1904 but otherwise has been held at every Olympics. Serbia captured their third title with a win over Croatia, while the United States won bronze by defeating Hungary.
The women's tournament of water polo at the 2024 Summer Olympics at Paris, France was held from 27 July to 10 August 2024. It was held at the Paris Aquatic Centre and Paris La Défense Arena. It is the seventh official appearance of the tournament.
Brazil 
Serbia (men)
United States (women)
Croatia (men)
Italy (women)
Russia (women)
Montenegro (men)
Hungary (women)
