Cosmopolitanism & its Role in International Law Transitions History, Focusing on Article 154 of the Constitution of the Islamic Republic of Iran

Cosmopolitanism is an idea according to which human beings, regardless of racial, national, religious, cultural, etc. are all citizens of a single community. On the other hand, the concept of the Islamic United Ummah also refers to the unity of human beings but is based on ideological and Islamic unity between them. From this point of view, perhaps the idea can be interpreted as a kind of Islamic cosmopolitanism. The main questions of this research are “Which of the mentioned ideas has influenced the constitution and the practical procedure of the Islamic Republic of Iran?” and “To what extent does the ideal view of the ruling Islamic system on the issue of unity among Muslims and the establishment of a single world government, comply with international law standards?” The research findings, which are based on descriptive-analytical research methods and based on library and documentary studies, indicate that theoretically and practically, the Islamic Republic of Iran, while striving for the realization of a society based on the idea of a single nation and the establishment of a world Islamic government, has always considered itself committed to the principles accepted in international law, including the principle of non-interference. The importance of this research is enlightening the thoughts towards the adaptation of our country's approach to cosmopolitanism based on the united ummah with international law.