Over the years, jürgen Habermas and Andrew Moravcsik have both written an impressive collection of academic works and public literature, dealing with one of the most contentious issues in the socio-political field, namely the process of European integration. Despite their shared interest in subjects as the European constitution, the democratic deficit and a common European identity, little of their work has been examined from a comparative and interdisciplinary perspective. Therefore, this study confronts their main arguments through an intellectual dialogue. The aim is not to reconcile their views, it is rather an attempt to juxtapose their analyses, in order to make a critical assessment of the current challenges to the EU.