After briefly introducing the concepts of constitutionalisation and europeanisation of the Italian administrative law, the paper deals with the relationship between these two processes, stressing on the one hand their substantial convergences (i.e. the europeanisation partially steers the constitutionalisation of administrative law) and on the other hand underling some problematic aspects. Moreover, the effective role of the Constitution in the current situation of Italian administrative law is discussed, in order to verify whether a trend toward deconstitutionalisation is really afoot, what is its possible scope is and what are its possible causes and consequences. Due attention is obviously paid also to the advancing weight of the European Convention on Human Rights and the jurisprudence of its Court.