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 sent 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.
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.
China competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's ninth appearance at the Summer Olympics since its debut in 1952. A total of 384 Chinese athletes, 136 men and 248 women, were selected by the Chinese Olympic Committee to compete in 28 sports. For the third time in its Olympic history, China was represented by more female than male athletes.
Spain competed at the 2004 Summer Olympics in Athens, Greece, from August 13 to 29, 2004. This nation has competed in every Summer Olympic Games since its official debut in 1920. Spain, however, boycotted two editions, the 1936 Summer Olympics in Nazi Germany, and the 1956 Summer Olympics in Melbourne, as a protest to the Soviet invasion of Hungary. The Spanish Olympic Committee sent the nation's third largest delegation in history to the Games. A total of 317 athletes, 177 men and 140 women, competed in 26 sports.
New Zealand competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's twenty-second appearance at the Olympics since its debut in 1908 as part of Australasia. The New Zealand Olympic Committee sent a total of 148 athletes, 81 men, and 67 women to the Games to compete in 18 sports, surpassing a single athlete short of the record from Sydney four years earlier. Basketball and field hockey were the only team-based sports in which New Zealand had its representation at these Olympic Games. There was only a single competitor in archery, boxing, and fencing.
Iran competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. The nation has competed at every Summer Olympic games, since its official debut in 1948 with the exception of the 1980 and 1984 Summer Olympics. The National Olympic Committee of the Islamic Republic of Iran sent a total of 38 athletes, 37 men and 1 woman, to compete in 10 sports. Half-lightweight judoka Arash Miresmaeili, who later forfeited his first match against Israel's Ehud Vaks for medical reasons, was the nation's flag bearer in the opening ceremony.
Argentina competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's twenty-first appearance at the Olympic Games, except for three different editions. Argentina did not attend 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. The sailor Carlos Espínola was the nation's flag bearer at the opening ceremony. 152 competitors, 106 men and 46 women, took part in 86 events in 22 sports.
Iran competed at the 1976 Summer Olympics in Montreal, Quebec, Canada. 86 competitors, 82 men and 4 women, took part in 50 events in 9 sports. Moslem Eskandar-Filabi was the flagbearer for Iran in the opening ceremony. This would be the last Olympics Iran would take part in until the 1988 Summer Olympics in Seoul, due to the Iranian Revolution two years later and the eventual outbreak of the Iran–Iraq War.
Iran competed at the 1972 Summer Olympics in Munich, West Germany. Iran sent a delegation of 50 competitors, all men, who participated in 33 events in 7 sports. Two competitors in the football tournament did not take part in any matches.
Iran competed at the Summer Olympic Games for the first time at the 1948 Summer Olympics in London, England. 36 competitors, all men, took part in 23 events in 5 sports. The country's sole medal was a weightlifting bronze won in the featherweight division by Jafar Salmasi.
Iran competed at the 1964 Summer Olympics in Tokyo, Japan. 63 athletes represented Iran in the 1964 Olympics.
Iran competed at the 1968 Summer Olympics in Mexico City, Mexico. 14 athletes represented Iran in the 1968 Olympics.
Germany competed at the 2008 Summer Olympics in Beijing, People's Republic of China. A total of 439 athletes were nominated to participate in the Games. The German Olympic Sports Confederation nominated athletes on 29 May, 23 June and 15 July 2008. Reaching the qualification standard set by the relevant sport's international governing body did not automatically mean that the athlete was nominated for Beijing, as the DOSB had stricter qualification standards. An athlete needed to have a somewhat realistic chance for a top 12 position. An exception to this are the team events, as the number of competing teams is already very limited through the IOC standards, and a chance for a respective place is already given by the qualification.
Croatia competed at the 2008 Summer Olympics in Beijing, People's Republic of China.
South Korea competed at the 2008 Summer Olympics in Beijing, China. This is a list of all of the South Korean athletes who qualified for the Olympics and their results. South Korea sent a delegation of 267 athletes to these games.
The Russian Federation competed at the 2008 Summer Olympics, held in Beijing, China, represented by the Russian Olympic Committee. Russia competed in all sports except baseball, field hockey, football, softball, and taekwondo. They ranked third in the medal table by golds (24) and overall (60). Russia also had 14 medals stripped for doping violations, the most of any nation at the 2008 Olympics.
Poland competed at the Beijing 2008 Summer Olympics. The country's delegation included 268 athletes.
Greece competed at the 2008 Summer Olympics in Beijing, People's Republic of China. They were represented by the Hellenic Olympic Committee, which announced on July 28, 2008, the 156 Greek athletes to compete in Beijing, composed of 84 men and 72 women, the largest Greek Olympic team ever excluding the home team of the Athens 2004 Olympics. Greece took part in archery, athletics, basketball, boxing, canoeing, cycling, diving, gymnastics, judo, rowing, sailing, shooting, swimming, synchronized swimming, table tennis, taekwondo, tennis, triathlon, beach volleyball, water polo, weightlifting and wrestling.
The United States competed at the 2004 Summer Olympics in Athens, Greece. 533 competitors, 279 men and 254 women, took part in 254 events in 31 sports.
