This book is the result of an academic project, funded by the Hercules Programme of the European Commission to study legislation dealing with crimes against the Financial Interest of the EU awarded to the Department of European and Comparative Law within the Faculty of Laws of the University of Malta. The study deals with the notion of criminal law at the European Union level as well as the relationship between the EU legal order and the national legal order. The focus of the study is on the development of EU criminal legislation aimed at protecting the financial interests of the EU, with a focus on cybercrime, fraud and public spending. It starts with the current legal basis in the TFEU, followed by the development of EU legislation in the area as well as the legislation of relevant bodies, such as EPO, OLAF and EUROPOL. The study tackles how this legislation is being received by the national legal orders, whereby eleven EU Member States are selected based on size, geography and legal systems. These Member States are France, Ireland, Croatia, Estonia, Germany, Italy, Malta, Spain, Latvia, Greece and Poland. A comparative study is made between those sections of EU criminal law dealing with the financial interests of the EU in these Member States to analyse the current legislation and propose future developments. The study, which is led by the editors based at the University of Malta, examines the subject from a European perspective. Besides the European perspective, the study focuses on national case-studies, followed by a comparative analysis.