Many countries are fighting against corruption and illegal activities in government bodies, public agencies or the private sector. In order to establish the best possible system for the protection of persons reporting irregularities and the implementation of Directive (EU) 2019/1937 of the European Parliament and the Council of October 23, 2019, on the protection of persons who report violations of the rights of the Union, in April 2022 the Republic of Croatia adopted a new Act for the Protection of Persons Reporting Irregularities, which regulates the legal area of protecting those who report irregularities. A key role in the promotion and protection of rights at the local, national, and international levels is played by the Ombudsman, whose institution is responsible for external reporting of irregularities. This paper analyzes the institution of the Ombudsman, its powers, and its role in the protection of persons reporting irregularities. The ombudsman is independent in her work, protects the constitutional and legal rights of citizens, and is a representative of the Croatian Parliament, to which she submits an annual report containing the information obtained from her actions in the past year. Membership in the European Network of Ombudsmen strengthens the institution by exchanging information on the laws and policies of the European Union and best practices. In this context, the subject of this paper is to clarify and bring closer to the persons reporting irregularities the ways and conditions of reporting irregularities, and through the analysis of reports and the use of channels for reporting irregularities, to provide guidelines for possible reforms and strengthening the role of the Ombudsman. Researching this topic helps to better understand the mechanisms available to employees when reporting irregularities they have encountered in the work environment.