This thesis provides an overview of research on organizational culture within the Tax Administration and is based on a study of organizational culture using an online questionnaire conducted by Ivan Rimac during the academic year 2022/2023, under the mentorship of Associate Professor Dr. Teo Giljević. Organizational culture is a "hot topic in contemporary organizational theory" and a fundamental subject of recent research. A precise and concrete definition of organizational culture is not easy to determine. The organizational culture of the Tax Administration is shaped by its employees, their customs, patterns of behavior, and their attitudes towards work and the organization itself. Understanding the organizational culture is essential for successful operations and implementing changes. The effectiveness of organizational culture largely depends on whether the organization's goals are achieved, as well as the overall scope of work of its employees. As an employee of the Tax Administration and a student of the Specialist Graduate Program in Public Administration, I decided to analyze the organizational culture of the organization in which I work through this thesis. The organizational culture of the Tax Administration represents a set of values, norms, and beliefs that characterize how the organization functions and how its employees behave and work together. The significance of this paper lies in the fact that culture plays a crucial role in shaping the behavior and work processes within the Tax Administration. A good organizational culture could contribute to better tax collection, greater tax discipline, and a reduction in the possibility of corruption among tax officials. This suggests that the existing framework of values and norms within the Tax Administration may impact these aspects of its work. Evaluating and considering organizational culture can help identify weaknesses and strengths and provide guidance for necessary changes. Furthermore, the participation of Tax Administration officials in the research project on organizational culture demonstrates their willingness to address this issue and contribute to improvements. The examination and analysis of organizational culture can serve as a foundation for the development of strategies and initiatives aimed at enhancing the work of the Tax Administration and achieving better results in tax collection, tax discipline, and the reduction of corruption. In the preparation of this thesis, the methods of induction and deduction were used, along with statistical methods within the research framework. Data for the research were collected through a survey questionnaire, using a random selection of participants. The results indicate a dominant, hierarchical, and strong reactive culture within the tax administration.