On 2 October 1997 in Amsterdam the Plenipotentiaries of the Kingdom of Belgium, the Kingdom of Denmark, the Federal Republicof Germany, the Hellenic Republic, the Kingdom of Spain, the French Republic, Ireland, the Italian Republic, the Grand Duchy of Luxembourg, the Kingdom of the Netherlands, the Republic of Austria, the Portuguese Republic, the Republic of Finland, the Kingdom of Sweden and the United Kingdom of Great Britain and Northern Ireland signed the Treaty of Amsterdam amending the Treaty on European Union, the Treaties establishing the European Communities and certain related acts.
Shínigh Lánchumhachtaigh Ríocht na Beilge, Ríocht na Danmhairge, Phoblacht Chónaidhme na Gearmáine, na Poblachta Heilléanaí, Ríocht na Spáinne, Phoblacht na Fraince, na hÉireann, Phoblacht na hIodáile, Ard-Diúcacht Lucsamburg, Ríocht na hÍsiltíre, Phoblacht na hOstaire, Phoblacht na Portaingéile,Phoblacht na Fionlainne, Ríocht na Sualainne agus Ríocht Aontaithena Breataine Móire agus Thuaisceart Éireann Conradh Amstardamag leasú an Chonartha ar an Aontas Eorpach, na gConarthaí agbunú na gComhphobal Eorpach agus ionstraimí gaolmhara áirithein Amstardam ar an 2 Deireadh Fómhair 1997.