Kazakhstan competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's third appearance at the Summer Olympics in the post-Soviet era.
Belarus competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. This was the nation's fifth appearance at the Summer Olympics in the post-Soviet era. The Belarus Olympic Committee sent a total of 166 athletes to the Games, 90 men and 76 women, to compete in 20 sports.
Republic of Cyprus competed at the 2012 Summer Olympics in London, United Kingdom from 27 July to 12 August 2012. This was the nation's ninth consecutive appearance at the Olympics.
Czech Republic competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. This was the nation's fifth appearance at the Summer Olympics after gaining its independence from the former Czechoslovakia. The Czech Olympic Committee sent a total of 133 athletes to the Games, 68 men and 65 women, to compete in 19 sports.
Finland 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 1908. The Finnish Olympic Committee sent a total of 56 athletes to the Games, 29 men and 27 women, to compete in 14 sports. There was only a single competitor in artistic gymnastics, taekwondo, weightlifting and tennis.
Germany competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's sixth consecutive appearance at the Summer Olympics after its reunification in 1990. The German Olympic Sports Confederation sent the nation's smallest delegation to the Games since its reunification. A total of 392 athletes, 218 men and 174 women, competed in 23 sports, and were nominated by DOSB on four occasions.
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.
Estonia competed at the 2012 Summer Olympics in London, United Kingdom from 27 July to 12 August 2012. This was the nation's eleventh appearance at the Summer Olympics.
The Netherlands competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. Dutch athletes have competed in every Summer Olympic Games since their official debut in 1908, with the exception of the 1956 Summer Olympics in Melbourne, which the Netherlands boycotted because of the Soviet invasion of Hungary. The Netherlands National Olympic Committee sent the nation's smallest delegation to the Games since 1988. A total of 175 athletes, 95 men and 80 women, competed in 18 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.
Poland competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's twentieth appearance at the Summer Olympics, having missed the 1984 Summer Olympics in Los Angeles because of the Soviet boycott. The Polish Olympic Committee sent a total of 218 athletes to the Games, 130 men and 88 women, to compete in 22 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.
Bulgaria competed at the 2012 Summer Olympics in London, United Kingdom from 27 July to 12 August 2012. It was the nation's nineteenth appearance at the Summer Olympics, having missed the Olympics on three occasions, including the 1984 Summer Olympics in Los Angeles because of the Soviet boycott. Despite this being London's third Olympic Games, this was the first time a Bulgarian team appeared at a London Olympics. The Bulgarian Olympic Committee sent the nation's smallest delegation to the Games, tying the record with Helsinki in 1952, and with Tokyo in 1964. A total of 63 athletes, 36 men and 27 women, competed in 16 sports. Men's volleyball was the only team event in which Bulgaria was represented in these Olympic games. There was only a single competitor in badminton, sprint canoeing, fencing, and judo.
Colombia competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's eighteenth appearance at the Olympics, having not competed at the 1952 Summer Olympics in Helsinki.
Slovakia competed in the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's fifth consecutive appearance at the Summer Olympics. The Slovak Olympic Committee sent a total of 47 athletes to the Games, 26 men and 21 women, to compete in 11 sports. There was only a single competitor in badminton, judo, triathlon, and weightlifting.
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.
Colombia competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's nineteenth appearance at the Summer Olympics. The Colombian Olympic Committee sent the nation's largest ever delegation to the Games, with 147 athletes, 74 men and 73 women, competing across 23 sports.
Kazakhstan competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. It was the nation's sixth consecutive appearance at the Summer Olympics in the post-Soviet era. The National Olympic Committee of the Republic of Kazakhstan fielded a roster of 104 athletes, 55 men and 49 women, to compete across seventeen different sports at these Games, the smallest Summer Olympic team since the nation's debut in Atlanta 1996. Moreover, Kazakhstan did not send teams in any of the team sports for the first time in twenty years. Track and field accounted for the largest number of athletes on the Kazakh squad, with 25 entries. There was a single competitor each in slalom canoeing, track cycling, fencing, and table tennis.
Slovenia 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. This was the nation's eighth consecutive appearance at the Summer Olympics as an independent nation. Slovenian athletes won five medals, including three gold, won by canoeist Benjamin Savšek, road racing cyclist Primož Roglič, and sport climber Janja Garnbret. Three gold medals is an all-time record for Slovenia at the Summer Olympics, having previously won two gold in 2000. The Olympics saw the debut of the men's basketball team who finished fourth in the tournament.
Kazakhstan 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 seventh consecutive appearance at the Summer Olympics in the post-Soviet era.
Russian Empire (1900–1912)
Soviet Union (1952–1988)
Unified Team (1992)
