Guatemala competed at the 2012 Summer Olympics in London from 27 July to 12 August 2012. This was the nation's thirteenth appearance at the Summer Olympics, having missed three Olympics after its debut at the 1952 Summer Olympics in Helsinki.
Portugal competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Portuguese athletes had appeared in every edition of the Summer Olympic Games since the nation's debut in 1912.
Sweden competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 3 to 20 August 2016. Swedish athletes have competed at every Summer Olympic Games in the modern era, except for the 1904 Summer Olympics in St. Louis. They extended their medal-winning streak to 47 straight Olympic Games by obtaining a silver in women's road race.
Croatia competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's seventh consecutive appearance at the Summer Olympics. The Croatian Olympic Committee confirmed a roster of 87 athletes, 68 men and 19 women, to compete across 18 sports at the Games.
Norway competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Since the nation's debut in 1900, Norwegian athletes have appeared in every edition of the Summer Olympic Games, except for two occasions: the 1904 Summer Olympics in St. Louis and the 1980 Summer Olympics in Moscow, due to the country's support for the United States-led boycott.
Slovenia competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's seventh consecutive appearance at the Summer Olympics as an independent nation.
Spain, represented by the Spanish Olympic Committee (COE), competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Since the nation's official debut in 1920, Spanish athletes have appeared in every edition of the Summer Olympic Games except for two; the 1936 Summer Olympics in Nazi Germany, and the 1956 Summer Olympics in Melbourne, as a protest against the Soviet invasion of Hungary. The Spanish Olympic Committee sent a total of 306 athletes, 163 men and 143 women, to compete in 25 sports.
Singapore competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's sixteenth appearance at the Summer Olympics, except for two different editions. Singapore was part of the Malaysian team at the 1964 Summer Olympics in Tokyo, but did not attend at the 1980 Summer Olympics in Moscow, because of its partial support to the United States boycott.
Cyprus competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's tenth consecutive appearance at the Summer Olympics.
Mexico competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's twenty-third appearance at the Summer Olympics. The Mexican Olympic Committee sent the nation's largest delegation to the Games since 1972, with a total of 124 athletes, 80 men and 44 women, competing across 26 sports.
Estonia competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. It was the nation's seventh consecutive appearance at the Games in the post-Soviet era and twelfth overall in Summer Olympic history.
Greece competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Greek athletes have competed in every Summer Olympic Games of the modern era, alongside Australia, France, Great Britain, and Switzerland. As the progenitor nation of the Olympic Games and in keeping with tradition, Greece entered first at the Maracanã Stadium during the opening ceremony.
El Salvador competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's eleventh appearance at the Summer Olympics, although it first competed in 1968.
Cuba competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's twentieth appearance at the Summer Olympics. The Cuban team consisted of 124 athletes, 89 men and 35 women, across eighteen sports.
Dominican Republic competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's fourteenth consecutive appearance at the Summer Olympics.
Peru competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Since the nation's official debut in 1936, Peruvian athletes have appeared in every edition of the Summer Olympic Games throughout the modern era. Peru failed to register any athletes at the 1952 Summer Olympics in Helsinki.
Chile competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Since the nation's debut in 1896, Chilean athletes have appeared in every Summer Olympic Games of the modern era, except for two different occasions. Chile did not attend the 1932 Summer Olympics in Los Angeles at the period of the worldwide Great Depression and was also part of the US-led boycott, when Moscow hosted the 1980 Summer Olympics.
Bolivia 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, since its debut in 1936.
Uruguay competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil from 5 to 21 August 2016. Since the nation's official debut in 1920, Uruguayan athletes have appeared in every edition of the Summer Olympic Games, with the exception of the 1980 Summer Olympics in Moscow, because of its partial support to the United States-led boycott.
Guatemala is expected to compete at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games have been postponed to 23 July to 8 August 2021, because of the 2019–20 coronavirus pandemic. It will be the nation's fifteenth appearance at the Summer Olympics since its debut in 1952, despite failing to register any athletes in three other editions.
