The 2011 Special Olympics World Summer Games (, ), was a sporting event in Athens, Greece. The opening ceremony of the games took place on 25 June 2011 at the Panathenaic Stadium and the closing ceremony was held on 4 July 2011.
Over 7,500 athletes, from 185 countries, competed in a total of 22 sports.
This is a list of countries participating in the 2011 Special Olympics World Summer Games ():