Bulgaria competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's seventeenth appearance at the Summer Olympics, except for three occasions, including the 1948 Summer Olympics in London due to the nation's role in World War II and 1984 Summer Olympics in Los Angeles because of the Soviet boycott. The Bulgarian Olympic Committee sent 95 athletes, 49 men and 46 women, to compete in 19 sports. Shooting champion and four-time Olympian Mariya Grozdeva became the nation's first ever female flag bearer in 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.
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.
Kazakhstan competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's fifth appearance at the Summer Olympics in the post-Soviet era.
Austria competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. The nation has competed at every edition of Summer Olympic Games, except the 1920 Summer Olympics in Antwerp. The Österreichisches Olympisches Comité sent a total of 70 athletes to the Games, 39 men and 31 women, to compete in 17 sports. This was approximately the same size as the previous Games, with the difference of one male athlete, the addition of one female athlete and three sporting events participated in. There was only a single competitor in eventing, fencing, rhythmic gymnastics, modern pentathlon, and Greco-Roman wrestling.
Chile competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This nation has competed at every Olympic Games, except the 1932 Summer Olympics in Los Angeles, and the 1980 Summer Olympics in Moscow because of the United States boycott.
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.
Algeria competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. This was the nation's twelfth consecutive appearance at the Summer Olympics, except for the 1976 Summer Olympics in Montreal because of the African boycott.
Morocco competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. It was the nation's thirteenth appearance at the Olympics, having not participated at the 1980 Summer Olympics in Moscow because of its support of the United States boycott.
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.
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 World War II, the worldwide Great Depression and the Soviet boycott, respectively.
Ukraine 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.
Ecuador competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. It was the nation's fourteenth appearance at the Summer Olympics since its debut in 1924.
Iran competed at the 2016 Summer Olympics in Rio de Janeiro, from 5 to 21 August 2016. Since the nation's return in 1948 after having made their debut in 1900, Iranian athletes had attended in every Summer Olympic Games of the modern era, with the exception of the 1980 and 1984 Summer Olympics.
Mongolia competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Since the nation made its debut in 1964, Mongolian athletes had appeared in every edition of the Summer Olympic Games, with the exception of the 1984 Summer Olympics in Los Angeles, because of its partial support to the Soviet boycott.
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.
Morocco competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's fourteenth appearance at the Summer Olympics.
Algeria competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Since the nation's debut in 1964, Algerian athletes had appeared in every edition of the Summer Olympic Games, but did not attend the 1976 Summer Olympics in Montreal, Quebec, Canada, because of the African boycott.
Uzbekistan 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.
