Guyana at the 2008 Summer Olympics

The Beijing National Stadium, where Harris, Burnett, and Pompey competed in their events

Adam Harris, who was 21 at the time of the Beijing Olympics, was the sole male track athlete participating on Guyana's behalf in 2008. Born in the Chicago area, Harris previously participated as an athlete at the University of Michigan. In Beijing, Adam Harris participated in the men's 200 meters dash, marking the first time he ever participated in any Olympic event.[4] Harris participated in the first heat during the 17 August qualification round of his event, and finished the race in sixth place at 21.36 seconds. Harris placed ahead of Jordan's Khalil Al Hanahneh (21.55 seconds) and behind Botswana's Fanuel Kenosi (21.09 seconds). The leaders of Harris' heat included the United States' Shawn Crawford (20.61 seconds) and Poland's Marcin Jedrusinski (20.64 seconds).[5] Out of the 62 finishing athletes, Harris ranked 50th. He did not advance to later rounds.[5]

Marian Burnett participated on Guyana's behalf in the women's 800 meters race at the Beijing Olympics. Born in Linden, Burnett has been affiliated with the athletics program at Louisiana State University in Baton Rouge. His appearance at Beijing marked her second after her appearance in the same event at the 2004 Summer Olympics in Athens, where she also represented Guyana.[6] During the 14 August qualification round, Burnett was placed in the second heat. She completed the race in 2:02.02, placing fifth in a heat of seven people. Burnett placed ahead of the United States' Alice Schmidt (2:02.33) and behind Belarus' Sviatlana Usovich (2:00.42) in a heat led by the Ukraine's Yuliya Krevsun (2:00.21) and Russia's Tatiana Andrianova (2:00.31).[7] Out of the 40 finishing athletes, Burnett placed 23rd. She did not advance to later rounds.[7]

Manhattan College-affiliated athlete Aliann Pompey, (or Allann Pompey[8]) a runner who was born in the capital city of Georgetown and has trained with the Shore Aquatics Club in New Jersey, represented Guyana at the Beijing Olympics in the women's 400 meters race. Pompey had run this race for Guyana both in Athens and during the 2000 Summer Olympics in Sydney and had advanced past the first round each time.[9] During the 16 August qualification round, Pompey competed in the fifth heat and finished the race in 50.99 seconds, placing second behind the United States' Sanya Richards (50.43 seconds) and ahead of Nigeria's Folashade Abugan (51.45 seconds). Out of the 50 participating athletes, Pompey ranked sixth. She advanced to the semifinal round.[8]

At semifinals, which took place on 17 August, Pompey was placed in the first heat. She finished the race in 50.93 seconds and placed fourth out of the eight athletes in the heat, ahead of the United States' Mary Wineberg (51.13 seconds) but behind Russia's Tatiana Firova (50.31 seconds). The leaders of Pompey's semifinal heat were Great Britain's Christine Ohuruogu (50.14 seconds) and Jamaica's Shericka Williams (50.28 seconds).[8] Out of the 24 athletes who advanced to the semifinal round, Pompey ranked 11th. She did not advance to the final round.[8]