Supreme audit institutions play a key role in the preservation of the environment, which has become one of the most important topics today. The role of supreme audit institutions has expanded beyond traditional financial audits, performance audits and compliance audits and now includes assessing the impact and effectiveness of measures taken to conserve natural resources. Through environmental audits, supreme audit institutions contribute to strengthening accountability and transparency in the public sector. These institutions also encourage cooperation in the environmental audit process, which contributes to better monitoring and implementation of legal frameworks. Also, Supreme Audit Institutions assist countries in improving their environmental practices and reducing the risks associated with environmental degradation. Their work includes monitoring international standards such as the Sustainable Development Goals, which are also presented in the thesis, thereby ensuring that the institutions' policies are in line with global goals. The aim of this thesis is to analyze the strategies and guidelines that have been developed for the integration of environmental issues into audit processes and to assess the impact of audits focused on the environment on sustainable development policies. The activities that supreme audit institutions can undertake in their offices, which contribute to the preservation of the environment, are presented in more detail. The paper emphasizes the importance of supreme audit institutions for achieving better results in the field of ecological sustainability and responsible management of natural resources.