Merger Treaty 

Merger Treaty of the three Communities establishing a Single Council and a Single Commission of the European Communities 


The Merger Treaty of 1965 merged the executive bodies of the existing European Communities into a single Commission and established a single Council of the European Communities.

As agreed in the Convention on certain institutions common to the European Communities, signed in Rome in 1957, there was already a single Parliamentary Assembly and a single Court of Justice.

Following the merger of the institutions, the three communities - the European Coal and Steel Community, the European Economic Community and the European Atomic Energy Community (Euratom) – became collectively known as the European Communities.

  • Signed in: Brussels (Belgium) 8 April 1965
  • Entry into force: 1 July 1967