Brazil participated in the 2010 Summer Youth Olympics in Singapore.
Zimbabwe participated in the 2010 Summer Youth Olympics in Singapore.
Austria competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Montenegro participated in the 2010 Summer Youth Olympics in Singapore.
Somalia competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010. The nation was represented by the Somali Olympic Committee, which sent a total of two athletes to compete in one sport, athletics. The flagbearer at the opening ceremony for the nation was athlete Abdulahi Kulow. Somalia's Olympic team was one of the 106 that did not win a single medal at the Games.
Bolivia competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Benin competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Bermuda competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
The British Virgin Islands competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Burundi competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Chad competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Dominica competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Central African Republic competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
The Democratic Republic of the Congo competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Madagascar competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Sierra Leone competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010. The nation was represented by the National Olympic Committee of Sierra Leone, which sent a total of three athletes to compete in one sport, athletics. The flagbearer at the opening ceremony for the nation was athlete Nenneh Barrie. Sierra Leone's Olympic team was one of the 106 that did not win a single medal at the Games.
Syria competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
East Timor competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Yemen competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Zambia competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
