Purpose: This study aimed to examine the relationship between Organizational culture and change management in Public libraries of Tehran City using the components of the Denison Model. Achieving this goal, the study seeked to identify the relationship between the mission, adaptability, and alignment components. Ultimately, the research investigated the connection between the involvement in the participatory work component and change management in Tehran Public Libraries Foundation.Methods: This research was a quantitative and correlational one. The entire population included all employees of Public libraries in the Tehran City institution, totaling about 360 individuals. The sample size, based on Morgan's table, is 186 individuals who were randomly selected using cluster sampling. The data collection tool was a researcher-made questionnaire consisting of 28 questions designed to assess the relationship between Organizational culture components and change management in Iran Public Libraries Foundation.Findings: The Organizational culture dimention, based on the Denison Model components, is deemed acceptable with an average of 3.84. Additionally, there is a significant relationship between the Denison model components (mission, adaptability, alignment, involvement in participatory work) and change management in Public library institutions. According to Friedman's ranking test, engage in work has the highest impact on change management with 2.69, surpassing other model components, while mission has the minimal impact on change management with 2.40.Conclusion: The components of involvement in work, adaptability, alignment, and mission of Organizational culture, according to the Denison model, have scored higher than average and demonstrated a desirable status in employee change management. So it seems the dominant Organizational culture in the studied libraries aligns with Denison's components. Considering the average scores of Organizational culture components and change management, and their direct correlation, the results shows Organizational culture is a crucial factor in the change process in the studied libraries. To enhance readiness for change in these libraries, it is recommended that Organizational culture be prepared for acceptance and alignment with changes through training and the support of senior managers.