In this impressive Commentary, Pierre Hauck analyzes the provisions of Regulation (EU, Euratom) No 883/2013 of the European Parliament and of the Council of 11 September 2013 concerning investigations conducted by the European Anti-Fraud Office (OLAF). For the first time since the authority was established in 1999, this pioneering work offers a comprehensive evaluation and systematization of the relevant case law and literature. Key Features: Explains the wording of all individual provisions of the OLAF Regulation Answers questions concerning the external and internal financial investigations of the European Anti-Fraud Office Provides a comparative examination of EU law from the perspective of the legislation of the individual Member States Outlines offences affecting the financial interests of the European Union such as fraud, including VAT and subsidy fraud, and corruption The OLAF Regulation is an indispensable reference for all those who work with this legal framework, including practitioners at the supranational EU level and at the national level. In addition, the work will also be of great interest to all academics in the fields of criminal law and justice, European law, corruption and economic crime, and finance and economics.