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.
Serbia and Montenegro competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. Previously known as the Federal Republic of Yugoslavia, this was the nation's third and last joint appearance at the Summer Olympics before Serbia and Montenegro became separated independent states in 2006. The Olympic Committee of Serbia and Montenegro sent a total of 85 athletes to the Games, 78 men and 7 women, to compete in 14 sports. Men's basketball, football, volleyball, and water polo were the only team-based sports in which Serbia and Montenegro had its representation at these Games. There was only a single competitor in road cycling, judo, tennis, and wrestling.
France competed at the 2012 Summer Olympics in London, between 27 July and 12 August 2012. French athletes have competed in every Summer Olympic Games of the modern era. The French Olympic Committee sent a total of 330 athletes to the Games, 183 men and 147 women, to compete in 24 sports.
Spain competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This nation has competed in all but two Summer Olympic Games since its official debut in 1920. Spain boycotted two editions, the 1936 Summer Olympics in Nazi Germany and the 1956 Summer Olympics in Melbourne, as a protest against the Soviet invasion of Hungary. In 2012, the Spanish Olympic Committee sent the nation's smallest delegation to the Games since 1988. A total of 278 athletes, 166 men and 112 women, competed in 23 sports.
Italy competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This nation 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 smallest delegation to the Games since the 1988 Summer Olympics in Seoul. A total of 285 athletes, 162 men and 123 women, competed in 22 sports.
Hungary competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. 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 the nation's smallest delegation to the Games since 1956. A total of 159 athletes, 97 men and 62 women, competed in 18 sports.
Argentina competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. This was the nation's twenty-third appearance at the Summer Olympic Games, having missed only three editions: the 1904 Summer Olympics in St. Louis, the 1912 Summer Olympics in Stockholm, and the 1980 Summer Olympics in Moscow, because of its support for the United States-led boycott.
South Korea competed at the 2012 Summer Olympics in London, from July 27 to August 12, 2012. This was the nation's sixteenth appearance at the Olympics, having missed the 1980 Summer Olympics in Moscow because of its support for the United States boycott. The Korean Olympic Committee sent the nation's smallest delegation to the Games since 1992. A total of 248 athletes, 135 men and 113 women, competed in 22 sports.
Serbia competed at the 2012 Summer Olympics in London. This was the nation's third appearance at the Summer Olympics.
The Russian Federation competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. This was the nation's fifth consecutive appearance at the Summer Olympics as an independent nation. The Russian Olympic Committee sent a total of 436 athletes to the Games, 208 men and 228 women, to compete in 24 sports. For the first time in its Olympic history, Russia was represented by more female than male athletes.
Croatia competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. This was the nation's sixth consecutive appearance at the Summer Olympics.
Norway competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's twenty-fourth appearance at the Summer Olympics; Norway did not take part in the 1904 Summer Olympics in St. Louis and the 1980 Summer Olympics in Moscow, due to the country's support for the United States boycott. The Norwegian Olympic and Paralympic Committee and Confederation of Sports sent a total of 66 athletes to the Games, 34 men and 32 women, to compete in 14 sports. Women's handball was the only team-based sport in which Norway was represented in these Olympic games. There was only a single competitor in badminton, mountain biking, diving, equestrian dressage, fencing and wrestling.
Sweden competed at the 2012 Summer Olympics in London, from 25 July to 12 August 2012. Swedish athletes have competed at every edition of the Summer Olympic Games in the modern era, except for the 1904 Summer Olympics in St. Louis. The Swedish Olympic Committee sent a total of 134 athletes to the Games, 55 men and 79 women, to compete in 20 sports. For the second consecutive time in its Olympic history, Sweden was represented by more female than male athletes.
Greece competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. The Hellenic Olympic Committee sent a total of 103 athletes to the Games in London, 65 men and 38 women, to compete in 19 sports. Men's water polo was the only team event in which Greece was represented at these Olympic Games.
Denmark competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. The National Olympic Committee and Sports Confederation of Denmark sent the nation's second largest delegation to the Games after the 1996 Summer Olympics in Atlanta. A total of 113 athletes, 63 men and 50 women, competed in 17 sports, although two additional athletes played as team reserves. Handball was the only team-based sport in which Denmark was represented in at these Olympic games.
Tunisia competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's thirteenth appearance at the Olympics, having missed the 1980 Summer Olympics in Moscow because of its partial support for the United States boycott.
Angola competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. This was the nation's eighth Olympic appearance at the Olympics, except the 1984 Summer Olympics in Los Angeles because of its participation in the Soviet boycott.
Iceland competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. The nation celebrated its centennial anniversary in the Olympics, having participated at every games since 1912, except for four occasions.
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.
Montenegro 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. It was the nation's fourth consecutive appearance at the Summer Olympics since gaining independence in 2006.
Yugoslavia (1920–1992W)
Independent Olympic Participants (1992S)
Serbia and Montenegro (1996–2006)
