This paper is devoted to the role of the State Inspectorate in the implementation of inspection supervision in the state administration system of the Republic of Croatia. The State Inspectorate is a centralized and preventive mechanism of inspection supervision. According to the Act on the State Inspectorate, there are 16 different inspections. State inspectors as civil servants (selected according to professional criteria) carry out inspections, are independent in their work and act according to the Act on the State Inspectorate, the Act on General Administrative Procedure as well as a wide range of other laws and regulations depending on the scope of a particular inspection. The work of the State Inspectorate is managed by the Chief State Inspector, who is a state official (selected on the basis of political criteria). State inspectors have the right to legal protection, organizational and technical working conditions and protection of moral and physical integrity. The Republic of Croatia is responsible for any damage inspectors may cause to third parties, which has the right of recourse against the inspector. The procedure is initiated ex offo or at the proposal of the proposer. During the procedure, a record is kept as evidence of the actions taken and the course of the administrative procedure. The most important stage of the procedure is making the administrative act, which is made in written form. An appeal can be filed against the decision. In accordance with the permitted exception under the Constitution of the Republic of Croatia, that the right to appeal against individual acts of the court, state and other bodies can be limited if another way of legal protection is determined by the Act on the State Inspectorate stipulates that against the administrative act of the construction inspector, an administrative dispute can be initiated by a lawsuit.