3–4 April: Second Europe-Asia summit, held in London.
28 April: The European Court of Justice rules that EU nationals may obtain medical treatment in any state and be reimbursed according to the state in which they are insured (the Kohll vs "Union des Caisses de Maladie" and Decker vs "Caisse de Maladie des Employés Privés" ruling).
3 May: The European Council, meeting in Brussels, approves the 11 member states outlined in the Commission report which will adopt the euro in 1999. Following this, they agree to regulations on technical issues regarding the coins and the central bank governors. The Commission and Monetary Institute set the conditions for irrevocable conversion rates for the euro.
26 May: The member states adopting the euro appoint the first president, vice president and executive board members of the European Central Bank.
1 June: The European Central Bank is established, succeeding the Monetary Institute.
15–16 June: European Council in Cardiff (UK) on economic growth.
11–12 December: European Council in Vienna (Austria) adopts employment guidelines, agrees external representation for the euro and adopts an action plan for the establishment of an area of freedom, security and justice.