The role of the clergy in the contemporary history of Iran has always been significant, especially during critical periods when there was a perceived need for spiritual and political leadership. This research examines the role of the clergy in four major arenas, including the Sacred Defense, seditions and socio-political incidents, and the defense of the Holy Shrines. The Sacred Defense is one of the most prominent periods in the history of the Islamic Revolution of Iran, during which the clergy, particularly Imam Khomeini (RA), played an effective role in guiding society and mobilizing the people. Furthermore, the clergy has had an active and influential presence in the political and social spheres, both in confronting internal seditions and crises, such as the 88 sedition, and in countering external threats, such as the defense of the Holy Shrines. The aim of this research is to analyze and examine the various dimensions of the role of the clergy in these arenas and its impact on Iran’s political, social, and defensive developments. This study utilizes a qualitative content analysis method to arrive at significant results in this field by examining various historical sources and analyzing data. The conclusion of this research shows that the clergy, in various crises—from the Sacred Defense to seditions and religious wars—has always played a pivotal role with its wise and religious leadership in strengthening national solidarity and defending Islamic and national principles.