Belarus competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's fifth appearance at the Summer Olympics in the post-Soviet era. The Belarus Olympic Committee sent a total of 151 athletes to the Games, 82 men and 69 women, to compete in 22 sports.
Uzbekistan competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's third consecutive appearance at the Olympics. The National Olympic Committee of the Republic of Uzbekistan sent a total of 70 athletes to the Games, 52 men and 18 women, to compete in 13 different sports, tying its delegation record with Sydney four years earlier. There was only a single competitor in road cycling, artistic and trampoline gymnastics, and table tennis.
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.
Bulgaria was represented by 72 athletes at the 2008 Summer Olympics, held in Beijing, People's Republic of China.
Poland competed at the Beijing 2008 Summer Olympics. The country's delegation included 268 athletes.
Belarus attended the 2008 Summer Olympics in Beijing, China. A team of 181 athletes competed in 28 different sports.
Colombia competed at the 2008 Summer Olympics. The country sent 68 athletes to compete in 15 sports, making this Colombia's largest ever delegation to the Olympics.
Cuba competed in the 2008 Summer Olympics in Beijing, People's Republic of China. As of 8 August 2008, 165 Cuban athletes had qualified to compete in 16 sports. The country's flagbearer at the opening ceremony was wrestler Mijaín López.
Lithuania competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's eighth appearance at the Summer Olympics. The National Olympic Committee of Lithuania sent a total of 62 athletes to the Games, 39 men and 23 women, to compete in 14 sports. Men's basketball was the only team-based sport in which Lithuania had its representation in these Olympic games.
Iran competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. 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 the nation's second-largest delegation to the Games, one less than it sent to Beijing. A total of 53 athletes, 45 men and 8 women, competed in 14 sports. This was also the youngest delegation in Iran's Olympic history, with half the team under the age of 25, and many of them are expected to reach their peak in time for the 2016 Summer Olympics in Rio de Janeiro. Heavyweight boxer Ali Mazaheri was the nation's flag bearer at the opening ceremony.
Uzbekistan competed at the 2012 Summer Olympics in London, from July 27 to August 12, 2012. This was the nation's fifth consecutive appearance at the Olympics. The National Olympic Committee of the Republic of Uzbekistan sent the nation's smallest delegation to the Games in the post-Soviet era. A total of 54 athletes, 36 men and 18 women, competed in 13 sports. There was only a single competitor in fencing, rhythmic and trampoline gymnastics, shooting and tennis.
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.
Ukraine competed at the 2012 Summer Olympics in London, from July 27 to August 12, 2012. This was the nation's fifth consecutive appearance at the Summer Olympics in the post-Soviet era. The National Olympic Committee of Ukraine sent a total of 238 athletes, split equally between men and women, to compete in 21 sports.
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.
Cuba competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's nineteenth appearance in the Olympics. With baseball's removal from the Olympic program and the absence of the nation's volleyball team for the first time, the Cuban Olympic Committee sent the nation's smallest delegation to the Games since 1964. A total of 111 athletes, 66 men and 45 women, competed in 13 sports. There was only a single competitor in archery and table tennis.
Romania competed at the 2012 Summer Olympics in London from 27 July to 12 August 2012. This nation has competed at the Summer Olympic Games since its official debut in 1924, missing only two editions, including the 1948 Summer Olympics. Despite being London's third Olympic Games, this is the first time the Romanian team has competed in London. The Romanian Olympic and Sports Committee sent a total of 103 athletes to the Games, 54 men and 49 women, to compete in 14 sports.
Vietnam competed at the 2012 Summer Olympics in London, from July 27 to August 12, 2012. This was the nation's eighth appearance at the Olympics, having missed the 1984 Summer Olympics in Los Angeles, because of the Soviet boycott.
Cameroon competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. This was the nation's thirteenth appearance at the Olympics.
Bulgaria competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Bulgaria made their official debut at the 1896 Summer Olympics in Athens. Bulgarian athletes had appeared in every edition of the Summer Olympics since 1924, except for three occasions: the 1948 Summer Olympics in London, and the 1932 and 1984 Summer Olympics in Los Angeles because of Bulgaria's actions in WW2, the worldwide Great Depression and the Soviet boycott, respectively.
Azerbaijan competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's sixth consecutive appearance at the Summer Olympics in the post-Soviet era.
Russian Empire (1900–1912)
Soviet Union (1952–1988)
Unified Team (1992)
