The Hague Congress was held in the Congress of Europe in Hague from 7th to 11th of May 1948 with 800 delegates participating from around Europe as well as observers from Canada and the United States.

Organised by the International Committee of the Movements for European Unity and presided over by Winston Churchill, the Congress brought together representatives from across a broad political spectrum, providing them with the opportunity to discuss ideas about the development of European Union. Important political figures such as Konrad Adenauer, Winston Churchill, Harold Macmillan, François Mitterrand, Paul-Henry Spaak, Albert Coppé and Altiero Spinelli took an active role in the congress and a call was launched for a political, economic and monetary Union of Europe. This landmark conference was to have a profound influence on the shape of the European Movement, which was created soon afterwards.