Indonesia competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's twelfth appearance at the Olympics, excluding the 1964 Summer Olympics in Tokyo, and the 1980 Summer Olympics in Moscow because of the United States boycott. Krisna Bayu was originally the flag bearer, however the role was later done by Christian Hadinata because Bayu was suffering from flu at the eve of opening ceremony.
Malaysia competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's twelfth appearance at the Olympics, although it had previously competed in two other games under the name Malaya. Malaysia, however, did not participate at the 1980 Summer Olympics in Moscow, because of its partial support to the United States boycott.
Israel competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's thirteenth appearance at the Summer Olympics.
Singapore competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's thirteenth appearance at the 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.
Malta competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's thirteenth appearance at the Olympics since its debut in 1928.
Maldives competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.
The United States Virgin Islands competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.
The Federated States of Micronesia competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.
Cyprus competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.
Benin competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.
Nicaragua competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.
Bermuda competed at the 2004 Summer Olympics in Athens, Greece from 13 to 29 August 2004. This was the nation's fifteenth appearance at the Olympics, except the 1980 Summer Olympics in Moscow.
Switzerland competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. Swiss athletes competed at every Summer Olympic Games in the modern era, except when they boycotted the 1956 Summer Olympics in Melbourne as a protest to the Soviet invasion of Hungary. The Swiss Olympic Association sent a total of 98 athletes to the Games, 59 men and 39 women, to compete in 18 sports.
Turkmenistan competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.
Eritrea competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. The nation won its first Olympic medal ever at these Games, in its second appearance.
Nepal competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.
Iceland competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. Icelandic athletes have competed at every Summer Olympic Games in the modern era since 1912, except for four occasions.
Lebanon competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.
Guyana competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's fourteenth appearance at the Olympics as an independent nation, although it had previously competed in five other games as British Guiana. Guyana did not compete in the 1976 Summer Olympics in Montreal because of its partial support to the African boycott.
Bahrain competed at the 2012 Summer Olympics in London, United Kingdom from 27 July to 12 August 2012. This nation marked its eighth appearance in the Summer Olympics. However, there were concerns about the nation's participation to the games due to its recent political uprising.
