Brazil participated in the 2010 Summer Youth Olympics in Singapore.
France competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Hungary competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Italy competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Japan competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Austria competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Fiji participated in the 2010 Summer Youth Olympics in Singapore.
Cuba competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
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.
Haiti competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Comoros competed at the 2010 Summer Youth Olympics in Singapore, from 14 to 26 August 2010. This marked the first time Comoros has competed at the Summer Youth Olympics.
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.
Libya competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Myanmar competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Papua New Guinea competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Senegal competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from 14 August to 26 August 2010.
Seychelles competed at the 2010 Summer Youth Olympics, the inaugural Youth Olympic Games, held in Singapore from August 14 to August 26, 2010. The nation was represented by the Seychelles Olympic and Commonwealth Games Association, which sent a total of four athletes to compete in four sports. The flagbearer at the opening ceremony for the nation was badminton player Kervin Ghislain. Seychelles' Olympic team was one of the 106 that did not win a single medal at the Games.
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.
Tunisia 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.
