The purpose of this article is to consider the effect of the draft Treaty establishing a Constitution for Europe on the European Court of Justice (ECJ). At the time of writing, the future of the draft Constitution is somewhat uncertain. Having been finalised by the Convention on the Future of Europe in the summer of 2003 and submitted to the then President of the European Council, it formed the basis for discussion at an intergovernmental conference (IGC) which opened in October 2003. Hopes that the text might be finalised by the end of the year were dashed when a meeting of the IGC in Brussels in December 2003 ended prematurely amid disagreement over the weighting of votes in the Council. However, it seems likely that a treaty equipping the European Union with a Constitution based on the Convention’s draft will in due course be adopted and that the provisions of the draft dealing with the ECJ will not be changed significantly. Even if either assumption proves misplaced, those provisions will remain of interest as reflecting one view of the position the ECJ might occupy in a constitutional order of the Union.