Regarding Iran’s presence in international organizations, it should be noted that since the Islamic Revolution, there has been a prevailing skepticism within the political system toward Western- and US-centered international organizations. Nevertheless, in line with its look to the east foreign policy, its competition with the West, and its desire to engage with the Global South and developing countries, Iran has consistently welcomed participation in regional and transregional organizations that are not viewed with suspicion by the political system and are not in conflict with the principles of the Islamic Revolution. This study, drawing on realist theories concerning the role, status, and purpose of international institutions and organizations, explores the structure, nature, and position of the transregional BRICS group and examines Iran’s membership in this alliance. The research question is: What implications and consequences does Iran’s membership in BRICS hold for the country? From a realist perspective, it is evident that BRICS serves as a balancing tool for China against US hegemony. Thus, the Islamic Republic of Iran, by joining BRICS and aligning with the hegemony of China (and Russia) as favorable partners against the dominant hegemony (the US), aims to challenge the narrative and norms of American hegemonic threats and promote a multipolar global order. Iran also seeks to benefit from this membership through expanded relations with the Global South—from East Asia to Africa and Latin America—enhanced regional trade, infrastructure and economic development, foreign investment attraction, energy exchange and oil sales, sanctions mitigation, and ultimately transforming into an international transit hub. Accordingly, from a realist viewpoint, cooperation is not impossible; rather, it can be leveraged when it aligns with national interests and power. This study employs a descriptive-analytical method and is based on library and online sources.