Nikolaos MILIONIS was born in Menidi (Amfilohia), Greece, in 1959.
He is a Member of the European Court of Auditors since the 1st of January 2014. As long-standing Member of Chamber I, he was responsible for numerous audits in the area of the EU’s climate and environment policies. He was in charge of special report 29/2023 (The EU’s support for sustainable biofuels in transport – An unclear route ahead) and special report 06/2025 (EU actions tackling sea pollution by ships – Not yet out of troubled waters). He graduated from the Hellenic National School of Public Administration and entered the Hellenic Court of Audit as a First Instance Judge (Auditor) in 1989. He was appointed Appellate Judge (Conseiller Référendaire) in 1997, Councillor (Conseiller-Maître) in 2004 and Section President in 2011.
He acquired a PhD in Public Finance Law in 1998 (University of Athens), writing his thesis on ‘The Institutional Role of the Hellenic Court of Audit’. He has taught at the Hellenic National School of Public Administration (1997-1998) and at the Hellenic National School for the Judiciary (1998-2012). He is the author of the book “Accountability and the European Union, The Financial Dimension” (Nomiki Vivliothiki, 2021, in Greek).