Brunei, as Brunei Darussalam, competed at the 2004 Summer Olympics in Athens, Greece, which took place between 13 and 29 August 2004. The country's participation in Athens marked its fourth appearance at the Summer Olympics since its debut in the 1988 Summer Olympics.
Samuel Hernanz Obrador is a French-born Spanish slalom canoeist who has competed at the international level since 2004 He represented France in his first international season.
Allan Francisco Segura Medina is a Costa Rican race walker. He represented Costa Rica at the 2008 Summer Olympics in Beijing, where he became the nation's flag bearer at the opening ceremony. He competed in the men's 20 km race walk, where he finished only in thirty-ninth place, with a time of 1:27:10. Segura also achieved his best result in race walking, when he finished thirty-second at the 2008 IAAF World Race Walking Cup in Cheboksary, Russia, with the fastest possible time of 1:23:12.
Serhiy Mykolaiovych Advena is a Ukrainian former swimmer who specializes in the freestyle and butterfly swimming styles. He is a two-time Olympian, and a multiple-time Ukrainian record holder in both 100 and 200 m butterfly. He also helped out the Ukrainian team to upset their American rivals and claim the medley relay title (3:38.49) at the 2005 Summer Universiade in Izmir, Turkey.
Khalid Yahya Rushaka was the first Tanzanian to participate in the Olympics as a swimmer. His countrymen know Rushaka as the "Tanzanian Dolphin," for his legendary abilities in the water. "The remarkable story of how he learnt to swim and rose to fame is legendary. His father, Yahya Rushaka, was one of the sole survivors of the Mv Bukoba ferry disaster on Lake Victoria in 1996 that claimed a thousand lives. It was his father who encouraged Khalid to learn to swim from the stories he used to tell of the brave men who saved many lives because they could swim. His father inspired him to pursue a career in swimming. Rushaka coached himself with the help of youtube videos. He progressed quickly through the ranks and the Tanzianian Olympic Committee chose him to represent the nation. He specialized in sprint freestyle events. Rushaka represented Tanzania at the 2008 Summer Olympics in Beijing, where he competed for the men's 50 m freestyle. He finished third in the third heat by forty-five hundredths of a second (0.45) ahead of 13-year-old Seychellois swimmer Dwayne Didon, with a time of 28.50 seconds. Rushaka, however, failed to advance into the semi-finals by 6.37 seconds.
Mohamed Ikoki Msandeki is a Tanzanian marathon runner. He set his personal best time of 2:11:01, at the 2010 Gutenberg Marathon in Mainz, Germany Msandeki represented Tanzania at the 2012 Summer Olympics in London, where he competed for the men's marathon, along with his compatriots Samson Ramadhani and Faustine Mussa. However, he withdrew from the games on the day before the marathon event, because of illness.
Alexandru Roșu is a Romanian weightlifter. Rosu represented Romania at the 2008 Summer Olympics in Beijing, where he competed for the men's lightweight class (69 kg). Unfortunately, Rosu did not finish the event, as he successfully lifted 136 kg (300 lb) in the single-motion snatch, but failed to hoist 165 kg (364 lb) in the two-part, shoulder-to-overhead clean and jerk.
Virgil Munteanu is an amateur Romanian Greco-Roman wrestler, who played for the men's featherweight category. He won the bronze medal for his division at the 2008 European Wrestling Championships in Tampere, Finland. He is also a member of CS Alro Slatina, and is coached and trained by Dinu Obrucea.
Ion Iulian Panait is an amateur Romanian Greco-Roman wrestler, who played for the men's welterweight category. He won two silver medals for his division at the 2008 European Wrestling Championships in Tampere, Finland, and at the 2010 European Wrestling Championships in Baku, Azerbaijan. He is also a member of Dinamo București, and is coached and trained by Carare Petrica.
Eusebiu Iancu Diaconu is an amateur Romanian Greco-Roman wrestler, who played for the men's lightweight category. He is a two-time Olympian, a three-time medalist at the European Championships, and a three-time bronze medalist for his division at the World Championships. He is also a member of CCS Bacau Wrestling, and is coached and trained by Gheorghe Mocanu.
Luis Felipe Vivénes Urbanesa is an amateur Venezuelan freestyle wrestler, who played for the men's heavyweight category. He won two medals each for his division at the Pan American Games, and at the Central American and Caribbean Games.
Wolfgang Eduardo Mejías is a Venezuelan épée fencer. Mejias represented Venezuela at the 2008 Summer Olympics in Beijing, where he competed in two épée events.
Arkadiusz Rafał Sowa is a Polish marathon runner. He set a personal best time of 2:12:00, by finishing seventh at the 2007 Berlin Marathon.
Ndabili Bashingili is a Botswana marathon runner. Bashingili made his official debut for the 2004 Summer Olympics in Athens, where he placed twenty-fifth out of a hundred runners in the men's marathon, with a time of 2:18:09.
Roman Kejžar is a Slovenian long-distance and marathon runner. He is a three-time Olympian, and a 2004 national marathon champion. He also set both a national record and a personal best time of 2:11:50 at the 2000 Turin Marathon, earning him a spot on the Slovenian team for the Olympics.
Roman Romanovych Bondaruk is a Ukrainian sport shooter.
Yang Wang is a New Zealand sport shooter of Chinese origin. Yang represented his adopted nation New Zealand at the 2008 Summer Olympics in Beijing, where he competed in the men's 10 m air pistol. He finished only in thirty-ninth place by two points behind Germany's Florian Schmidt from the final attempt, for a total score of 571 targets.
Mark Spooner is a New Zealand weightlifter. Spooner represented New Zealand at the 2008 Summer Olympics in Beijing, where he competed for the men's lightweight category (69 kg). Spooner placed 21st in this event, as he successfully lifted 123 kg in the single-motion snatch, and hoisted 158 kg in the two-part, shoulder-to-overhead clean and jerk, for a total of 281 kg.
Kou Lei is a Ukrainian table tennis player of Chinese origin.
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.
Tanzania 
