The Philippines competed at the 2004 Summer Olympics in Athens, from 13 to 29 August 2004. This was the nation's eighteenth appearance at the Olympics, except the 1980 Summer Olympics in Moscow because of its partial support to the United States boycott.
Laos competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's sixth appearance at the Olympics, having attended every edition of the Olympiad since 1980 except the 1984 Summer Olympics in Los Angeles, because of the Soviet boycott.
Mauritius competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's sixth consecutive appearance at the Olympics.
El Salvador competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's eighth appearance at the Olympics.
Guatemala competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's eleventh appearance at the Summer Olympics, excluding three occasions after its national debut at the 1952 Summer Olympics in Helsinki.
Kyrgyzstan competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's third appearance at the Olympics in the post-Soviet era.
Barbados competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This nation marked its ninth appearance at the Olympics, except the 1980 Summer Olympics in Moscow because of the United States boycott.
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.
Senegal competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's eleventh appearance at the Olympics.
Grenada competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's sixth consecutive appearance at the Olympics.
Bosnia and Herzegovina competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's fourth appearance at the Summer Olympics since the post-Yugoslav era.
Panama 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 since its debut in 1920. Panama did not compete on four occasions, including the 1980 Summer Olympics in Moscow, because of its partial support of the United States boycott.
Uganda 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, except the 1976 Summer Olympics in Montreal, because of the African boycott. The Ugandan Olympic Committee sent a total of eleven athletes to the Games, nine men and two women, to compete in four different sports. Half of these athletes had been participating in boxing, including Joseph Lubega, who later became the nation's flag bearer in the opening ceremony. There was only a single competitor in swimming and weightlifting.
Macedonia 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 Summer Olympics in the post-Yugoslav era.
Zambia competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.
Moldova competed at the 2004 Summer Olympics in Athens, from 13 to 29 August 2004. This was the nation's third consecutive appearance at the Summer Olympics in the post-Soviet era.
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.
East Timor (Timor-Leste) competed at the 2004 Summer Olympics in Athens, Greece, which was held from 13 to 29 August. The nation's appearance at the 2004 Athens Games marked its official debut in any Olympic event and also the Summer Olympics.
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.
