Central Press/Hulton Archives/Getty Images Top Questions What is the League of Nations? The League of Nations was an organization for international cooperation. It was established on January 10, 1920, at the initiative of the victorious Allied powers at the end of World War I and was formally disbanded on April 19, 1946. Although ultimately it was unable to fulfill the hopes of its founders, its creation was an event of decisive importance in the history of international relations. When was the League of Nations established? The League of Nations was established on January 10, 1920. Where was the League of Nations located? Headquarters for the League of Nations were located in Geneva, Switzerland.