The paper analyzes the functions and responsibilities of the European Ombudsman, the central body in protecting the rights of European Union (EU) citizens and supporting transparency and accountability within European institutions. The historical development of the ombudsman's function is explained, from its beginning with the Maastricht Treaty in 1992 until today. Acting as an intermediary between citizens and EU institutions, the European Ombudsman is tasked with investigating complaints related to bad governance and advocating fair and transparent administrative procedures. The European Ombudsman can also conduct investigations on its own initiative in case of suspicion of "bad" governance. The scope and principles of the European Ombudsman's work are defined by the Statute and the European Code of Good Administrative Behavior of the European Ombudsman, which establish the legal basis for ensuring the effectiveness and autonomy of the Ombudsman institution in the EU. The paper analyzes the annual reports of the Ombudsman for the period from 2020 to 2023, with a focus on key topics including transparency, ethical standards, and the protection of fundamental rights. Quantitative data on the number of complaints received and the rate of compliance with the ombudsman's recommendations indicate the efficiency of the ombudsman's institution in improving administrative procedures and protecting the rights of European Union citizens.