Although the process of nation-building had begun in Iran decades ago, the Islamic Revolution created a paradigmatic shift in Iran's political structure, causing the nation to continue its life and development in a different ideological context and redefine itself in a new framework. From this perspective, the way and process of the formation of the social phenomenon of the nation in the modern sense in the form of the concepts and values ​​of Iranian society has become one of the most important concerns of thinkers, policymakers, and administrators. In order to explain this issue and achieve this goal, this article has attempted to present a precise and comprehensive understanding of the process of the maturation or lack of development of the nation in Iran after the Islamic Revolution, relying on Karl Deutsch's theory of nation-building. The main question: Why has nation-building, despite its relatively long history in Iran, still remained incomplete? Hypothesis: Nation-building in Iran, despite its relatively long history, has been considered merely within the framework of a process and has not been given careful and serious attention as a project by either the government or the nation. From this perspective, regarding the results of this research, it must be acknowledged that what has emerged in Iranian society so far is an echo of the nation and is far from its ideal model. It should be noted that the research method in this article is qualitative and causal.