The emergence of geopolitical changes in Iran's security environment, along with the consolidation of the Shah in the late 1960s, led to an increase in the regional role of the Pahlavi regime. It was on this basis that the Pahlavi regime, exerting itself as a regional power, expanded its influence in the Persian Gulf, trying to maintain regional stability and security, sometimes through coercion and sometimes through diplomacy and the expansion of relations with neighbors. Acted as a gendarmerie. The purpose of this article is to answer the question of what factors and how has the role of the Pahlavi regime as a regional power been influenced? Initial findings show that at the international level, the structural pressure of the international system is reduced by factors such as Cold War tensions, Britain's withdrawal from the Persian Gulf, and Nixon's doctrine coupled with the development of domestic capabilities leading to a triple role of leadership, Custodianship And regional protection for the Pahlavi Regime. In fact, given the Persian Gulf's blockade of the West and the Shah's relations with Washington, the Pahlavi regime succeeded in securing the region from the United States.