Afghanistan sent a delegation to compete at the 2004 Summer Olympics in Athens, Greece, which were held from 13 to 29 August 2004. This was the eleventh appearance of the nation in the Summer Olympics and their first since their reinstatement to the International Olympic Committee in 2003 following a four-year ban due to the Taliban government's discrimination against women and their opposition to them playing sports. The delegation consisted of five athletes: sprinters Masoud Azizi and Robina Muqimyar, boxer Basharmal Sultani, judoka Friba Rezayee and wrestler Bashir Ahmad Rahmati. Muqimayar and Rezayee's inclusion in the Afghan delegation marked the first time the country sent a woman athlete to a Summer Olympics. All five failed to progress any further than the preliminary round of their respective sports and Afghanistan's best performance at the Games was by Muqimayar who set a new national women's 100 metre record in her heat.
Georgia competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. Georgian National Olympic Committee (GNOC) sent the nation's smallest delegation to the Games since the post-Soviet era. A total of 32 athletes, 26 men and 6 women, competed in 10 different sports.
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.
Sierra Leone competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's eighth appearance at the Summer Olympics since its debut in the 1968 Summer Olympics. The Sierra Leone delegation included two track and field athletes; Lamin Tucker and Hawanatu Bangura, both of whom were sprinters that were selected via winning an event in Freetown, as the nation had no athletes that met the "A" or "B" standards in any event. Bangura was selected as flag bearer for the opening ceremony. Neither of the two athletes progressed beyond the heats.
Uzbekistan 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 Olympics. The National Olympic Committee of the Republic of Uzbekistan sent a total of 70 athletes to the Games, 52 men and 18 women, to compete in 13 different sports, tying its delegation record with Sydney four years earlier. There was only a single competitor in road cycling, artistic and trampoline gymnastics, and table tennis.
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.
Equatorial Guinea competed at the 2004 Summer Olympics in Athens, which was held from 13 to 29 August 2004. The country's participation at Athens marked its sixth appearance in the Summer Olympics since its début at the 1984 Summer Olympics. The delegation included two athletics competitors: Roberto Mandje and Emilia Mikue Ondo in the long and middle distance disciplines respectively. Mikue Ondo was selected as the flag bearer for the opening ceremony. Both athletes did not advance further than the first round of their respective events with Mandje failing to make the start of the men's 3000 metres steeplechase.
Equatorial Guinea participated in the 2000 Summer Olympics in Sydney, Australia, which was held from 15 September to 1 October 2000. The country's participation in Sydney marked its fifth appearance in the Summer Olympics since its debut at the 1984 Summer Olympics. The delegation included one middle-distance runner, one short-distance sprinter and two swimmers: José Luis Ebatela Nvo, Mari Paz Mosanga Motanga, Eric Moussambani and Paula Barila Bolopa respectively. All four athletes qualified for the games through wildcard places. Moussambani was selected as the flag bearer for the opening ceremony. The four athletes were unable to advance beyond the first rounds of their respective events, with Moussambani and Bolopa attracting attention for their poor performances, but were applauded by the crowds.
Kyoko Hamaguchi is a Japanese freestyle wrestler. She has won five FILA Wrestling World Championships and two Olympic Bronze medals in the 72 kg weight class.
Augusto Midana is a freestyle wrestler from Guinea-Bissau who competes in the men's middleweight (-74 kg) category. He represented Guinea-Bissau in the 2008 Summer Olympics in Beijing, China, and was the flagbearer for his nation during the opening ceremonies of those games. He competed again at the 2012 Summer Olympics, finishing in 7th place.
Guinea-Bissau competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's fifth consecutive appearance at the Olympics.
Tsogtbazaryn Enkhjargal is an amateur Mongolian freestyle wrestler, who competed in the women's flyweight category. Between 2001 and 2011, Enkhjargal had won a total of six medals for the 46, 48, and 51 kg classes at the Asian Wrestling Championships. She also captured three bronze medals in the same division at the Asian Games, and at the 2005 World Wrestling Championships in Budapest, Hungary.
Roshendra Julienne Mercedes Vrolijk is an Aruban former swimmer, who specialized in sprint freestyle events. She is one of Aruba's first Olympic swimmers, alongside Davy Bisslik, and also a two-time Olympian.
Angélique Berthenet-Hidalgo is a French retired amateur freestyle wrestler, who competed in the women's flyweight category. Considering one of the world's top female freestyle wrestlers in her decade, Berthenet has claimed a silver medal in the 47-kg division at the 1996 World Wrestling Championships in Sofia, Bulgaria, produced a staggering tally of five medals at the European Championships, and offered a chance to represent her country France at the 2004 Summer Olympics. Throughout her sporting career, Berthenet trained full-time for Dammarie Sport Wrestling Club, under her personal coach Ryszard Chelmowski.
Brigitte Wagner is a retired amateur German freestyle wrestler, who competed in the women's flyweight category. Considering one of the world's top female freestyle wrestlers in her decade, Wagner has claimed a gold and a silver medal in the 48-kg division at the World Championships, and seized an opportunity to compete for Germany at the 2004 Summer Olympics. Throughout her sporting career, Wagner trained full-time as a member of the wrestling squad for Siegfried Sports Club in Hallbergmoos, under her coach and four-time Olympian Jürgen Scheibe.
Lyndsay Belisle is a retired amateur Canadian freestyle wrestler, who competed in the women's flyweight category. Considering one of the world's top female freestyle wrestlers in her decade, Belisle has claimed two silver medals each in the 48 and 51-kg division at the 2003 Pan American Games in Santo Domingo, Dominican Republic, and at the 2006 World Wrestling Championships in Guangzhou, China, and seized an opportunity to compete for Canada at the 2004 Summer Olympics. Throughout her sporting career, Belisle trained full-time for the Burnaby Mountain Wrestling Club in Burnaby, British Columbia under her personal coach Mike Jones.
Lidiya Karamchakova is a retired amateur Russian-Tajikistani freestyle wrestler, who competed in the women's flyweight category. Karamchakova's wrestling career emerged with two career medals at the European Championships, before acquiring a dual citizenship to compete for Tajikistan in 2002. Since then, she scored a silver in the 48-kg division at the 2002 Asian Games in Busan, South Korea, and also finished seventh at the 2004 Summer Olympics. Karamchakova is also a member of the Viktor Wrestling Club in Krasnoyarsk, under her personal coach Viktor Raiko.
Fadhila Louati is a retired amateur Tunisian freestyle wrestler, who competed in the women's flyweight category. Considered one of the nation's top wrestlers in her decade, Louati has yielded a record of three gold medals in her career at the All-Africa Games, and at the 2001 Mediterranean Games in Tunis. She also had an opportunity to represent her nation Tunisia in the 48-kg division at the 2004 Summer Olympics, finishing fourteenth in the process. Louati is also a member of the wrestling squad for Centre Intégré de Radès in her native Tunis, under her personal coach Noureddine Mefri.
Fani Psatha is a retired amateur Greek freestyle wrestler, who competed in the women's flyweight category. Psatha has produced a full set of three career medals in different color, including her prestigious gold from the 2005 Mediterranean Games in Almería, Spain, and also finished tenth in the 48-kg division in Athens, when Greece hosted the 2004 Summer Olympics. Psatha trained throughout her sporting career for Psachna Evia Wrestling Club in Chalcis, under her personal coach Ioannis Tabounidis.
Guinea-Bissau competed at the 2016 Summer Olympics in Rio de Janeiro, from August 5 to 21, 2016. It was the nation's sixth consecutive appearance at the Summer Olympics.
Guinea-Bissau 
