Establishment followed pattern of similar organizations such as Labour and Socialist International, adapted for various centrist parties.

First constituent meeting of the International Entente of Radical and Similar Democratic Parties were organized on 29 August 1924 in Geneva under leadership of later Nobel Peace Prize awardee Ferdinand Buisson, who later acted as the President of the executive committee.

[4] Objective of the organization were to connect various political parties associated with liberalism and classical radicalism to promote essential democracy.

Organizational seat were located at headquarters of the French Radical Party at Volois Palace, Rue de Valois, Paris.

After foundation of the International Entente, it included member or associate parties of Belgium, Bulgaria, Czechoslovakia, Finland, France, Denmark, Germany, Greece, Lithuania, Luxembourg, the Netherlands, New Zealand, Norway, Poland, Romania, Sweden, Switzerland, Turkey,[5] and the United Kingdom.