Denmark competed at the 2000 Summer Olympics in Sydney, Australia.
Zimbabwe competed at the 2000 Summer Olympics in Sydney, Australia.
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.
El Salvador competed at the 2000 Summer Olympics in Sydney, Australia, from 15 September to 1 October 2000. This was the nation's seventh appearance at the Olympics.
Antigua and Barbuda competed at the 2000 Summer Olympics in Sydney, Australia.
Bermuda 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.
Israel competed at the 2000 Summer Olympics in Sydney, Australia. 39 competitors, 29 men and 10 women, took part in 43 events in 9 sports. The delegation of 39 athletes was the biggest at the time, and third-biggest in history, after 2008 with 40 and 2016 with 47.
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.
Puerto Rico competed at the 2000 Summer Olympics in Sydney, Australia. 29 competitors, 23 men and 6 women, took part in 31 events in 10 sports.
Armenia competed at the 2000 Summer Olympics in Sydney, Australia.
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.
Andorra competed at the 2000 Summer Olympics in Sydney, Australia.
Eritrea competed in the Olympic Games for the first time at the 2000 Summer Olympics in Sydney, Australia.
Aruba competed at the 2000 Summer Olympics in Sydney, Australia.
Kenya competed at the 2000 Summer Olympics in Sydney, Australia.
Sudan competed at the 2000 Summer Olympics in Sydney, Australia.
Suriname competed at the 2000 Summer Olympics in Sydney, Australia.
Haiti competed at the 2000 Summer Olympics in Sydney, Australia. The Haitian team consisted of five competitors: three track and field athletes, one judoka, and one tennis player.
Tanzania competed at the 2000 Summer Olympics in Sydney, Australia.
