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.
Dominican Republic competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's fourteenth consecutive appearance at the Summer Olympics.
Tanzania competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Seven athletes, five men and two women, competed in five events across three sports, but did not win any medals. Hilal Hemed Hilal, however, set a new national record in the men's 50 m freestyle event. Four athletes took part in track and field athletics, all in marathons, while two participated in the swimming tournament's 50 m freestyle category. The flagbearer for the opening ceremony was Andrew Thomas Mlugu, who was Tanzania's first Olympic judoka. His counterpart in the closing ceremony was Alphonce Felix Simbu, who had earned the nation's best finish at the Games by placing fifth in the men's marathon. Prior to these Games, Tanzania had sent athletes to twelve editions of the Summer Olympics.
Aruba competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's eighth consecutive appearance at the Summer Olympics.
Georgia competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's sixth consecutive appearance at the Summer Olympics in the post-Soviet era.
Ghana competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's fourteenth appearance at the Summer Olympics, having taken part in all but three editions since its debut at the 1952 Summer Olympics. Ghana did not attend the 1976 Olympics because of the African boycott and did not attend the 1980 Olympics because of the United States boycott.
Niger competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Since the nation made its debut in 1964, Nigerien athletes had participated in every edition of the Summer Olympic Games, except for two rare occasions, the 1976 Summer Olympics in Montreal, and the 1980 Summer Olympics in Moscow because of the African and the US-led boycotts, respectively.
Mali competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. Since the nation made its debut in 1964, Malian athletes had appeared in every edition of the Summer Olympic Games, with the exception of the 1976 Summer Olympics in Montreal because of the African boycott.
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.
American Samoa competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016. This was the nation's eighth consecutive appearance at the Summer Olympics.
Mohammad Tawfiq Bakhshi is an Afghan judoka. He competed at the 2016 Summer Olympics in the men's 100 kg event, in which he was eliminated in the first round by Jorge Fonseca. He was also the flag bearer for Afghanistan at the 2016 Summer Olympics Parade of Nations.
Sulaiman Hamad is a Saudi judoka. He competed at the 2016 Summer Olympics in the men's 66 kg, in which he was eliminated in the second round by Davaadorjiin Tömörkhüleg. He was the flag bearer for Saudi Arabia at the Parade of Nations.
Rachid Sidibé is a Burkinabé judoka. He competed at the 2016 Summer Olympics in the men's +100 kg event, in which he was eliminated in the first round by Iakiv Khammo. He was the flag bearer for Burkina Faso at the Parade of Nations.
Zeyad Mater is a Yemeni judoka. He competed at the 2016 Summer Olympics in the men's 73 kg event, in which he was eliminated in the second round by Victor Scvortov. He was the flag bearer for Yemen at the Parade of Nations.
Battulgyn Temüülen is a Mongolian judoka. He competed at the 2016 Summer Olympics in the men's +100 kg event, in which he was eliminated in the first round by Mohamed-Amine Tayeb. He was the flag bearer for Mongolia at the Parade of Nations.
Denis Nikolayevich Iartsev is a Russian judoka. He competed at the 2016 Summer Olympics in the men's 73 kg event, in which he was eliminated by Lasha Shavdatuashvili in the repechage.
Victor Scvortov is a Moldovan-born Emirati judoka. He originally represented his birth nation in international events, but he moved to the United Arab Emirates along with two other Moldovan judoka in 2013. He competed at the 2016 Summer Olympics in the men's 73 kg event, in which he was eliminated in the third round by Shohei Ono.
Magdiel Estrada is a Cuban judoka. He competed at the 2016 Summer Olympics in the men's 73 kg event, in which he was eliminated in the second round by Lasha Shavdatuashvili.
Chamara Repiyallage also known as Chamara Dharmawardana is a Sri Lankan judoka. He is also attached with Sri Lanka Air Force.
Ganbaataryn Odbayar is a Mongolian judoka. He competed at the 2016 Summer Olympics in the men's 73 kg event, in which he was eliminated in the third round by Nicholas Delpopolo. He won a bronze medal at the 2017 World Judo Championships in Budapest.
Tanzania 
