Denmark competed at the 2000 Summer Olympics in Sydney, Australia.
The Czech Republic competed at the 2000 Summer Olympics in Sydney, Australia.
Austria competed at the 2000 Summer Olympics in Sydney, Australia. 92 competitors, 55 men and 37 women, took part in 68 events in 17 sports.
Belarus competed at the 2000 Summer Olympics in Sydney, Australia. 139 competitors, 72 men and 67 women, took part in 109 events in 20 sports.
Mexico competed at the 2000 Summer Olympics in Sydney, Australia.
Slovenia competed at the 2000 Summer Olympics in Sydney, Australia. Slovenia won their first two summer Olympic gold medals at these games.
Indonesia competed at the 2000 Summer Olympics in Sydney, Australia.
Bulgaria competed at the 2000 Summer Olympics in Sydney, Australia.
Hong Kong competed at the 2000 Summer Olympics in Sydney, Australia under the name Hong Kong, China for the first time, as these were the first Games after the territory's handover from the United Kingdom to China in 1997.
Latvia competed at the 2000 Summer Olympics in Sydney, Australia. Latvia won their first summer Olympic gold medal at these games. 45 competitors, 30 men and 15 women, took part in 47 events in 13 sports.
Lithuania competed at the 2000 Summer Olympics in Sydney, Australia.
Azerbaijan competed at the 2000 Summer Olympics in Sydney, Australia. They won their first gold medal during these games. 31 competitors, 25 men and 6 women, took part in 14 events in 8 sports.
Romania competed at the 2000 Summer Olympics in Sydney, Australia. 145 competitors, 71 men and 74 women, took part in 116 events in 16 sports. At the Games, there was some controversy when gymnast Andreea Răducan was stripped of her individual all-around gold medal after testing positive for a stimulant. Răducan had taken cold medicine containing pseudoephedrine given to her by a team doctor.
Mozambique competed at the 2000 Summer Olympics in Sydney, Australia. Mozambique won their first Olympic gold medal at these games in the women's 800m, their only medal at the games.
Algeria competed at the 2000 Summer Olympics in Sydney, Australia. 47 competitors, 37 men and 10 women, took part in 42 events across 10 sports.
Ethiopia competed at the 2000 Summer Olympics in Sydney, Australia. These Games were the most successful for Ethiopia, as the country claimed four gold medals and eight overall.
Zambia competed at the 2000 Summer Olympics in Sydney, Australia. None of the competitors from Zambia won medals in the 2000 Olympic games.
Togo competed at the 2000 Summer Olympics in Sydney, Australia. They were awarded no medals.
Athletes from the Federal Republic of Yugoslavia competed at the 2000 Summer Olympics in Sydney, Australia. 109 competitors, 92 men and 17 women, took part in 50 events in 14 sports. These would be the last Summer Games in which athletes from Montenegro and Serbia participated under the name of Yugoslavia. They would compete as Serbia and Montenegro at the 2004 Summer Olympics.
The former State Union of Serbia and Montenegro was represented at the Olympic Games on six occasions between 1996 and 2006, when the union was dissolved and Montenegro and Serbia each declared full independence.
Yugoslavia (1920–1988)
Independent Olympic Participants (1992)
