Abstract To the surprise of many, questions have recently arisen over the scope of inquiry, if any, that a national court may, consistent with Article 54 of the ICSID Convention, make in connection with the enforcement of an ICSID award. It has long been assumed in many, if not most, quarters that a national court is privileged to condition enforcement of an ICSID Convention award on a single simple requirement, viz. that the award be certified by the Secretary-General of ICSID. Until recently, doubts over whether that is so have been raised in a very small number of jurisdictions. But the Commission of the European Union has taken the view that an ICSID Convention award may be denied enforcement if it is contrary to a principle of “autonomy” of EU law and, based on its judgment in Achmea case in connection with non-ICSID awards, the European Court of Justice most likely takes the same view. This suggests that the European Union regards violation of EU public policy, more generally, as a defense to enforcement of an ICSID award. Based on text, object and purpose, legislative history, and predominant state practice, this position appears to run seriously afoul of the ICSID Convention. At the same time, some meaning must be given to the language in Article 54 according to which an ICSID award must be enforced by a national court “as if it were a final judgment of a court” of the enforcing State. The author finds that the understanding of Article 54 that best reflects all pertinent considerations is that it imposes on courts the modest requirement that they subject the enforcement of ICSID awards to no more restrictive or onerous procedures than they impose on the enforecement of national judgments.