In this paper, the concept of corruption will be determined and defined, although a unique definition does not exist and every social science tries to give its definition of the term. In addition to the definition, it briefly analyses what types of corruption exist and what are the causes or consequences of corruption. Emphasis is placed on corruption in the public administration system, the ways in which corruption occurs in the first place through the presentation of selected examples. In this part, we particularly refer to conflicts of interest as the most classical example of corruption and there will be talk of corruption in public procurement. Furthermore, the paper highlights selected competent authorities relevant in the fight against corruption and the exercise of supervision of the work and acts of bodies belonging to the public administration system. The paper analyses the Conflict of Interest Decision-Making Commission and its role in preventing corruption in public authorities. Through the Institute of the Information commissioner and the right to access information, control and public administration must be public and accessible to all. The State Audit Office is an important institution in the Republic of Croatia that operates in accordance with the financial and reporting and legal framework. The selected examples of corruption in public administration are briefly presented. Finally, conclusive reflections on the selected topic of work are given.