The men's 800 metres at the 2004 Summer Olympics as part of the athletics program was held at the Athens Olympic Stadium from August 25 to 28. Seventy-two athletes from 58 nations competed. The event was won by 0.16 seconds by Yuriy Borzakovskiy of Russia, the first medal for the nation in the event. Wilson Kipketer of Denmark became the 10th man to win a second medal in the 800 metres.
The women's 800 metres at the 2004 Summer Olympics as part of the athletics program were held at the Athens Olympic Stadium from August 20 to 23.
Palau competed in the Olympic Games for the first time at the 2000 Summer Olympics in Sydney, Australia.
Geena Gall, is an Olympic American mid-distance runner who ran for the University of Michigan. Gall's achievements include back to back NCAA Outdoor Championships in the 800m in 2008 and 2009, representing the USA at the 2012 Olympic Games in London and 2009 World Championships in Athletics in Berlin, Germany in the 800m. She also competed at the North American Central American Caribbean Championships in San Salvador, El Salvador in 2007 and Toluca, Mexico in 2008. Gall was a member of the "Fab Four" who set two collegiate records at the 2007 Penn Relays, a ten-time NCAA All-American, owning two Big Ten 800 meter records and two DMR records, 10 Big Ten championships, numerous U of M school records, and at Grand Blanc High School she was a three-time national champion.
Grenada competed in the 2008 Summer Olympics, held in Beijing, People's Republic of China from 8 to 24 August 2008. Nine athletes represented the country, eight track and field athletes and one boxer. Of the eight track and field competitors, five were women, and three were men. Although none of the athletes would win a medal, runners Allison George and Neisha Bernard-Thomas progressed past the qualification rounds, and participated on behalf of Grenada in the quarterfinals of their events. Grenada's Beijing delegation was their biggest at nine athletes, and marked the seventh consecutive appearance of Grenada at the Olympics.
Guyana sent a team to compete at the 2008 Summer Olympics in Beijing, China. Four representatives of Guyana qualified to take part in the Beijing Games–Adam Harris, Marian Burnett, and Aliann Pompey in track, and Niall Roberts in swimming–and Pompey advanced past the first round in her event, progressing to semifinals. Meanwhile, Alika Morgan and Geron Williams (cycling) took part in the Games' Youth Olympics camp, held in Beijing at the same time as the Olympics. Along with coaches and administrative members, Guyana sent a total of ten people to Beijing. The appearance of Guyana's delegation in Beijing marked the fifteenth Guyanese Olympic delegation to appear at an Olympic games, which started with their participation as British Guiana in the 1948 Summer Olympics. There were no medalists from Guyana at the Beijing Olympics. Roberts was Guyana's flagbearer at the ceremonies in Beijing.
Alia Shanee Atkinson, СD is a Jamaican five-time Olympian and a former competitive swimmer whose international competition career spanned 19 years, 2003 to 2021 inclusive, at the senior level. At short course World Swimming Championships, she is a ten-time medalist in individual events, including four gold medals, four silver medals, and two bronze medals. She won a total of 124 medals, of which 74 were gold medals, at Swimming World Cup circuits over the course of her career. She won 14 total medals in individual events, 11 gold, 1 silver, and 2 bronze, from her first three Central American and Caribbean Games, in 2006, 2010, and 2018.
The Women's 800 metres competition at the 2012 Summer Olympics in London, United Kingdom. The event was held at the Olympic Stadium on 8–11 August. Mariya Savinova finished the race in first place, but she has since been stripped of the gold medal for doping.
Equatorial Guinea competed at the 2012 Summer Olympics in London, which was held from 27 July to 12 August 2012. The country's participation at London marked its eighth appearance in the Summer Olympics since its début at the 1984 Summer Olympics. The delegation included two track and field athletes, Benjamín Enzema and Bibiana Olama who both qualified for the Games via wildcard places because their fastest times did not meet the required qualification standards. Olama was selected as the flag bearer for both the opening and closing ceremonies. Both athletes did not advance beyond the first round of their respective events.
The United States' unincorporated territory of Guam competed at the 2012 Summer Olympics in London, held from July 27 to August 12, 2012. This was the territory's seventh consecutive appearance at the Olympics.
Melissa Breen is an Australian 100 metres and 200 metres runner. Breen broke the Australian record for the women's 100 m sprint, when she clocked 11.11 seconds at the ACT Championships, held on 9 Feb 2014 at the Australian Institute of Sport track in Canberra under ideal conditions with a 1.9 mps following wind, warm conditions and 600+ metres elevation. This broke a record previously held by Melinda Gainsford-Taylor, which had stood for more than 20 years.
Pilar Shimizu is a Guamanian breaststroke swimmer. While qualifying for the 2012 Summer Olympics she broke the 20-year-old national record set by Tammie Kaae, another Olympian from Guam. At these Olympics she became the youngest Olympian ever from Guam at age 16. She finished 42nd in the 100 meter breaststroke event and did not advance to the semifinals. Shimizu also competed in the 2016 Summer Olympics. Internationally, Shimizu has earned three bronze medals at the Oceania Games and two silver medals at the Pacific Games.
Derek Mandell is a Guamanian middle-distance runner. He took part in the 2008 Oceania Athletics Championships, winning bronze, and 2008 Summer Olympics, where he broke a personal men's 800m record even though Mandell was eliminated in the first round.
Celma da Graça Soares Bonfim is a Santomean long-distance runner. Da Graça represented São Tomé and Príncipe at the 2008 Summer Olympics in Beijing, where she carried the nation's flag for her team during the opening ceremony. She ran in the first heat of the women's 5000 metres, against fifteen other athletes, including Ethiopia's Tirunesh Dibaba, who eventually won the gold medal in this event. She finished the race in last place by more than forty seconds behind Malawi's Lucia Chandamale, with her personal best and national record-breaking time of 17:25.99. Da Graça, however, failed to advance into the semi-finals, as she placed thirtieth overall, and was ranked farther below six mandatory slots for the next round. At the 2016 Summer Olympics, da Graça competed in the Women's 1500 metres, but finished 14th, last in her heat, with a time of 4:38.86, failing to advance to the semifinals.
Nicole Teter is an American middle distance runner, who specialized in the 800 metres. She is a three-time U.S. indoor champion, and a two-time Olympian. She also won a gold medal in the same category at the 2002 U.S. Outdoor Championships.
Winnie Nanyondo is a Ugandan middle- and long-distance runner. She has represented her native country in several important international events, including both the 2016 Rio Olympics and 2020 Tokyo Olympics, the 2014 World University Cross Country Championships, the 2014 Commonwealth Games, the 2013 Summer Universiade, and the 2012 World Junior Championships in Athletics.
Regine Tugade-Watson is a Guamanian sprinter. She competed in the women's 100 metres event at the 2015 World Championships in Athletics in Beijing, China, as well as the girl's 200 m event at the 2015 World Youth Championships in Cali, Colombia. She competed in the women's 100 m preliminary round of the 2016 Summer Olympics. Tugade finished third place in her heat but did not progress further. She also competed in her second World Championships in 2017, competing in the 200 m. She holds seven Guamanian national records in athletics. In July 2021 she was a flag bearer in the Parade of Nations at the Tokyo Olympics opening ceremony.
Guam competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from August 5 to 21, 2016. This was the territory's eighth consecutive appearance at the Summer Olympics.
Halimah Nakaayi is a Ugandan middle-distance runner who specialises in the 800 metres. She is the 2019 World Champion at the event and won the bronze medal at the 2022 World Indoor Championships. Nakaayi is the current Ugandan record holder for the 800 m both outdoors and indoors, and also for the 1000 metres.
Nimali Waliwarsha Konda Liyanarachchi is a Sri Lankan 800 m runner and current national record holder in women's 1500m event. She is also believed to be the first Sri Lankan woman to have competed in steeplechase events. She became the first Sri Lankan woman to complete the distance of 3000 metres in steeplechase event under 11 minutes. She won the best athlete award twice at the Presidential award ceremonies by the Sports Ministry including the Most Outstanding Sportswoman of the Year in 2015. She is currently attached to Sri Lanka Air Force.
Guam 
