Au-delà des réformes institutionnelles concernant la Commission, le Conseil et la Cour de Justice, les autres institutions telles que le Parlement européen, le Comité économique et social européen, le Comité des régions, la Cour des comptes et la Banque centrale européenne ont vu leur architecture institutionnelle modifiée par le traité de Nice.
As well as the institutional reforms affecting the Commission, the Council and the Court of Justice, the other institutions such as the European Parliament, the Economic and Social Committee, the Committee of the Regions, the Court of Auditors and the European Central Bank have also seen changes made to their institutional set-up by the Treaty of Nice.