Nauru at the 2004 Summer Olympics

Saudi Arabia competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.

Botswana competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.

Kuwait competed at the 2004 Summer Olympics in Athens, Greece, held between 13 and 29 August 2004.

Belize sent a delegation to compete at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the Central American country's ninth appearance at a Summer Olympic Games. The delegation consisted of two track and field athletes: Michael Aguilar and Emma Wade; neither advanced beyond the first round of their events.

Saint Vincent and the Grenadines competed at the 2004 Summer Olympics in Athens, Greece from 13 to 29 August 2004.

Nepal competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.

Lebanon competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.

The island nation of Kiribati first participated in the 2004 Summer Olympics. It has competed at every Summer Games since then but has not yet entered the Winter Olympics.

The Pacific island nation Nauru first competed at the Summer Olympic Games in the 1996 games in Atlanta. It is the least populated nation in the 206-member International Olympic Committee. The nation is mainly known for its weightlifting tradition and all seven athletes that had competed for Nauru at the Olympics before 2012 were weightlifters.

Marcus Ajemada Stephen is a Nauruan politician and former sportsperson who previously was a member of the Cabinet of Nauru, and who served as President of Nauru from December 2007 to November 2011. The son of Nauruan parliamentarian Lawrence Stephen, Stephen was educated at St Bedes College and RMIT University in Victoria, Australia. Initially playing Australian rules football, he opted to pursue the sport of weightlifting, in which he represented Nauru at the Summer Olympics and Commonwealth Games between 1990 and 2002, winning seven Commonwealth gold medals.

Nauru competed at the 2000 Summer Olympics in Sydney, Australia.

Nauru competed at the 2008 Summer Olympics, that were celebrated in Beijing, China, from August 8 to August 24, 2008. Nauru was represented by the Nauru Olympic Committee, and was the only nation out of 204 participating nations and territories that sent only a single athlete, and was one of 117 that won no medals at the Games. The sole athlete to represent the nation was Itte Detenamo, who participated in the weightlifting, and was the flag bearer in both the opening and closing ceremonies. This was the same number of athletes as at the 1996 Olympics, when Marcus Stephen represented the country in the same sport, but was a decrease from the nation's last appearance at the Games when three athletes were sent to Athens. Nauru earned a berth for the weightlifting event in the Oceania and South Pacific Olympic Weightlifting Championships in 2008 and a chance to send participants in swimming and athletics events, but chose to send only a weightlifter. Itte Detenamo competed in the Group B of heavyweight class, fifteenth and last event of the weightlifting. He did not earn a medal, but finished with a personal best.

Reanna Solomon was a Nauruan weightlifter. She was the first female Nauruan athlete to win a Commonwealth Games gold medal, and remains one of the only three Nauruans ever to have won a Commonwealth Games gold, the others being Marcus Stephen and Yukio Peter.

Nauru Olympic Committee is the National Olympic Committee representing Nauru. It represents and organises the Olympic movement on the island. The NNOC was founded in 1991 and was recognised by the International Olympic Committee in 1994. It is also the body responsible for Nauru's representation at the Commonwealth Games.

Liechtenstein made its Paralympic Games début at the 1984 Summer Paralympics in Stoke Mandeville and New York City, entering just one athlete in athletics. The country competed again at the 1988 and 1992 Summer Games, and at the 1992 and 1994 Winter Games. It was then absent from the Paralympics until the 2004 Summer Games in Athens, where it sent just one table tennis player, Peter Frommelt. Liechtenstein was absent from the 2006 and 2010 Winter Games and the 2008 Summer Games.

Nauru 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 fifth appearance in the Summer Olympics since its debut at the 1996 Summer Olympics. The delegation consisted of two participants: Sled Dowabobo in the men's lightweight judo contest and Itte Detenamo in the men's super-heavyweight weightlifting competition. Dowabobo qualified as one of Oceania's highest ranked judo competitors while Detenamo made the Games based on his qualifying performance. Detenamo was the flag bearer for both the opening and closing ceremonies. Dowabobo was eliminated by his opponent Navruz Jurakobilov in the round of 64 and Detemano was 14th in his event.

Nauru competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. The country's participation in Brazil was its sixth consecutive appearance at the Summer Olympics since its debut at the 1996 Summer Olympics. Nauru's delegation included two participants: Ovini Uera, a judoka in the men's middleweight judo category; and Elson Brechtefeld in the men's 56 kg weightlifting competition. Uera qualified as Nauru's top-ranked judoka, in the IJF World Ranking List through a quota slot from the Oceania Judo Union. Brechtefeld qualified by grant from the International Weightlifting Federation of an unused quota place. Uera was eliminated by Varlam Liparteliani in the round of 16 and Brechtefeld finished 15th in his event.

Nauru competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, due to the COVID-19 pandemic. The country's participation in Tokyo marked its seventh appearance at the Summer Olympics since its debut in 1996.