This research examines the influence of the foreign policy of the twelfth government of the Islamic Republic of Iran towards Afghanistan, the special focus of the research will be on changing the approach of the twelfth government towards the Taliban and the role of Iran in the Afghan peace process. Also, Iran has tried to play a constructive role in the peace process of Afghanistan, which has also influenced the position of the Taliban. This research helps to better understand the dynamics of Iran's foreign policy in the region and the challenges facing it. The main question of the research is, what effect has the foreign policy of the 12th government of Iran had on the process of developments in Afghanistan, especially in relation to the Taliban? It seems that Iran's foreign policy in this period, while supporting the process of peace and stability in Afghanistan, has tried to maintain its national interests by adopting a pragmatic and realistic approach to the developments in this country and the re-emergence of the Taliban. The research method of this research is library, analytical and descriptive, which was done by using reliable domestic and foreign sources. To compile the research, the set of regional security theories and crisis management theories have been used in a consolidated manner. The research findings show that Iran's foreign policy in this period was formed based on the principles of constructive interaction, economic diplomacy and multilateralism.