Australia, the previous host of the 2000 Olympics at Sydney, 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.
Japan competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. Japanese athletes have competed at every Summer Olympic Games in the modern era since 1912 except for two editions; it was not invited to the 1948 Summer Olympics in London for its role in World War II, and was also part of the US-led boycott of the 1980 Summer Olympics in Moscow. The Japanese Olympic Committee sent a total of 306 athletes, 139 men and 167 women, to compete in 27 sports. For the first time in its Olympic history, Japan was represented by more female than male athletes.
Germany competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's fourth consecutive appearance at the Summer Olympics after its reunification in 1990. The German Olympic Sports Confederation sent the nation's second largest delegation to the Games since its reunification. A total of 441 athletes, 250 men and 191 women, competed in 27 sports, and were nominated by DOSB at four occasions.
Brazil competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's nineteenth appearance at the Summer Olympics, excluding the 1928 Summer Olympics in Amsterdam. The Brazilian Olympic Committee sent the nation's largest ever delegation in history to the Games. A total of 243 athletes, 124 men and 119 women, competed in 24 sports.
The United States was the host nation of the 1984 Summer Olympics in Los Angeles, California. It was the nineteenth time that Team USA participated, having boycotted the 1980 Summer Olympics. 522 competitors, 339 men and 183 women, took part in 217 events in 25 sports.
Chile competed at the 2000 Summer Olympics in Sydney, Australia. 50 competitors, 43 men and 7 women, took part in 28 events in 14 sports.
West Germany competed at the Olympic Games for the last time as an independent nation at the 1988 Summer Olympics in Seoul, South Korea. Following German reunification in 1990, a single German team competed in the 1992 Summer Olympics. 347 competitors, 244 men and 103 women, took part in 194 events in 24 sports.
Argentina competed at the 1988 Summer Olympics in Seoul, South Korea. 118 competitors, 93 men and 25 women, took part in 53 events in 18 sports. The country claimed Olympic medals for the first time since 1972.
Argentina competed at the 1928 Summer Olympics in Amsterdam, Netherlands, the nation's fifth appearance out of eight editions of the Summer Olympic Games. Argentina sent its second national team, under the auspices of the Argentine Olympic Committee, 81 athletes that competed in 41 events in 12 sports. Argentina competed in equestrian, football, sailing, water polo, and wrestling for the first time. Argentina won 3 gold medals, its first Olympic championships in boxing and swimming. The team also won its first medals in fencing and football.
Belgium competed at the 1928 Summer Olympics in Amsterdam, Netherlands. 187 competitors, 176 men and 11 women, took part in 90 events in 15 sports.
Japan competed at the 2008 Summer Olympics in Beijing, People's Republic of China. The delegation of athletes and officials were represented by the Japanese Olympic Committee.
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.
Italy competed at the 2008 Summer Olympics, held in Beijing, China. The country sent a delegation of 344 athletes to compete.
Brazil sent a delegation to compete at the 2008 Summer Olympics in Beijing, China, in August 2008. Brazilian athletes have competed in every Summer Olympic Games since 1920, except the 1928 Summer Olympics. The country is represented by the Brazilian Olympic Committee. Brazil headed to the Beijing Games with its largest Olympic delegation at the time, 277 athletes, including 132 women.
China was the host nation of the 2008 Summer Olympics. It was represented by the Chinese Olympic Committee (COC), and the team of selected athletes were officially known as Team China.
New Zealand took part in the 2008 Summer Olympics in Beijing, China. The country sent 182 competitors, making this its largest ever delegation to the Olympic Games. It was also one of the most successful, equalling New Zealand's combined medal tally from the previous two Summer games. On 16 August – dubbed "Super Saturday" by journalists – New Zealand had its greatest single day at any Olympics, winning 5 medals: two gold, one silver and two bronze. New Zealand also gained its first Olympic track medal since 1976 when Nick Willis won the silver medal in the men's 1500 metres, becoming the sixth New Zealander to win an Olympic medal in that event. The success at the Olympics has boosted Athletics participation since then.
Argentina competed at the 2008 Summer Olympics held in Beijing, China, from 8 to 24 August 2008. 137 athletes qualified for the Olympic Games in 19 sports. Manu Ginóbili, basketball player and gold medalist at the 2004 Summer Olympics, was the nation's flag bearer at the opening ceremony.
Honduras sent a delegation to compete at the 2008 Summer Olympics in Beijing, China.
The United States of America (USA) competed at the 2004 Summer Olympics in Athens, Greece. 533 competitors, 279 men and 254 women, took part in 254 events in 31 sports.
The United States of America (USA), the previous host of the 1996 Olympics at Atlanta, competed at the 2000 Summer Olympics in Sydney, Australia. 586 competitors, 333 men and 253 women, took part in 265 events in 31 sports.
Austria (1908–1912)
Russian Empire (1912)
