Supervision is one of the key concepts of modern public law, and in Iran, since the establishment and the acceptance of constitutionalism, this concept has gained serious legal relevance. As such, in the research literature of this discipline, various works have dealt with it, from different aspects. However, by consider iranian the public law literature, we realize that the concept of supervision is facing “Serious” ambiguity and confusion. Therefore, in this research, in order to address the reasons for this confusion and express the characteristics of the concept of supervision, we raised the question of how supervision should be understood as a concept in public law? And with the method of analytical critique, which is a more focused form of critical analysis, while critically examining the relevant research literature, we taken the concept of supervision as a Essentially Contested, Clustered, and Functional Concept. In this study, emphasizing that part of the ambiguity of the concept of supervision is natural, the diversity of application and equivalent institutions, the duality of legal-jurisprudential literature, the social and institutional nature of the concept of supervision, the lack of recognition of the relationship between term-meaning, and the lack of attention to the conceptual characteristics of supervision were raised as reasons for the confusion of this concept in the Iranian public law literature.