The European Union has undergone a constitutional transformation in the past half century. It has evolved from its origins as the European Economic Community, promoting economic integration, into a supranational polity that has come to be perceived in constitutional and even federal terms. This paper will explore the extent to which the modern-day EU can be said to possess some sort of constitution. In doing this, it will be necessary to decouple such a constitution from the notion of state constitutionalism and instead define it as a unique transnational constitution. Despite this, useful comparisons can be drawn between state constitutions and that of the EU, in order to ascertain the form the latter may take. Particularly useful in this regard is the analogy between the British constitutional model and the EU constitution. This paper concludes that the EU possesses a composite constitution more akin to that of the United Kingdom rather than a formal written text, as is typical in continental Europe. As such, in the present writer’s view, the Lisbon Treaty would feature, along with the other treaties, as a constitutional document within the constitutional arrangements of the EU, without it becoming a formal constitution itsel
