The European Coal and Steel Community (ECSC), was founded in 1951 by the six founding members: Belgium, the Netherlands and Luxembourg (the Benelux countries) and West Germany, France and Italy. Its purpose was to pool the steel and coal resources of the member states, and to support the economies of the participating countries. As a side effect, the ECSC helped defuse tensions between countries which had recently been fighting each other during the war. In time, this economic merger grew, adding members and broadening in scope, to become the European Economic Community, and later the European Union (EU).

The Netherlands is a founding member of the EU, NATO, OECD and WTO. Together with Belgium and Luxembourg it forms the Benelux economic union. The country is host to the Organisation for the Prohibition of Chemical Weapons and five international courts: the Permanent Court of Arbitration, the International Court of Justice, the International Criminal Tribunal for the Former Yugoslavia, the International Criminal Court and the Special Tribunal for Lebanon. The first four are situated in The Hague, as is the EU's criminal intelligence agency Europol and judicial co-operation agency Eurojust. This has led to the city being dubbed "the world's legal capital".