In the Constitution of the Islamic Republic of Iran, the term "government" has been used to express five distinct concepts. Each of these concepts places the state in a special legal status, which, in order to identify the rights and duties of the state and the people in the constitution, should be taken into account in the particular concept of government in each principle. If we do not define the government correctly in principles of the Constitution, it is possible that the principle in question is devoid of content or incompatible with the purposes of the constitution. Therefore, the concept of government in each principle must be derived from the general principles and evidences used for regulating the said Principle. In this study, the term "government" in Principles 3, 8, 9, 11, 14, 17, 21, 28, 30, 31, 41, 49, 53 and 55 refers to the terms, state or ruling class. The method used in this article for understanding this definition of the term Government, would be analytical, and should the Principle require a study from the standing point of history, literature and wording shall also be used.