Belgium competed at the 2000 Summer Olympics in Sydney, Australia.
The Czech Republic competed at the 2000 Summer Olympics in Sydney, Australia.
Ukraine competed at the 2000 Summer Olympics in Sydney, Australia. 230 competitors, 139 men and 91 women, took part in 185 events in 23 sports.
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.
Venezuela competed at the 2000 Summer Olympics in Sydney, Australia. 50 competitors, 36 men and 14 women, took part in 49 events in 17 sports.
Iceland competed at the 2000 Summer Olympics in Sydney, Australia.
Poland competed at the 2000 Summer Olympics in Sydney, Australia. 187 competitors, 129 men and 58 women, took part in 133 events in 20 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. Belarus had its best ever showing both in terms of gold and overall medals at these games. The gold medal result will be later matched in 2008.
Slovenia competed at the 2000 Summer Olympics in Sydney, Australia. Slovenia won their first two summer Olympic gold medals at these games.
Mauritius competed at the 2000 Summer Olympics in Sydney, Australia.
Croatia competed at the 2000 Summer Olympics in Sydney, Australia.
Estonia competed at the 2000 Summer Olympics in Sydney, Australia. 33 competitors, 31 men and 2 women, took part in 29 events in 11 sports.
Slovakia competed at the 2000 Summer Olympics in Sydney, Australia.
Uruguay 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.
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.
Bolivia competed at the 2000 Summer Olympics in Sydney, Australia.
Namibia competed at the 2000 Summer Olympics in Sydney, Australia. Four-time silver medalist sprinter Frankie Fredericks had to withdraw due to injury.
Ghana competed at the 2000 Summer Olympics in Sydney, Australia.
Russian Empire (1908–1912)
Soviet Union (1952–1988)
