Introduction -- Why Criminal Law? : The Question of and Models for the Legitimacy of Criminal Law -- Why EU Criminal Law? : The Question of and the Models for the Legitimacy of Supranational Criminal Law -- Rationales for the Harmonisation and Legitimacy of EU Criminal Law -- EU Competences on Securitised Criminalisation : From a Utilitarian to an Integrated Approach to EU Criminal Law -- EU Competences on Functional Criminalisation : The Route to Utilitarian EU Criminal Law -- From Tampere to Stockholm : The Path towards Integrated Legitimacy -- Legitimating EU Criminal Law in Practice : The Case of Racism and Xenophobia, Market Abuse and PIF -- Conclusions.