Critical infrastructure plays a key role in ensuring the national security of a state, due to important functions thereof in military, economic, and public administration sectors. The destruction, damage, failure or other deprivation of critical infrastructure of its operational capabilities constitutes a direct threat to the structural and personal security of the state. The research methods and techniques implemented in the research process itself primarily hinge on critical analysis of acts of law and organisational and competence-related documents, subject-matter literature, synthesis and inference in order to reach the formulated objectives based on efficiency criteria. The main findings indicate that critical infrastructure is perceived as a set of systems which exerts a substantial impact on the security of the state and, obviously, its inhabitants. The results advocate for a reflection that critical infrastructure embraces a number of facilities which appear to be remarkably diverse. They are buildings, structures, installations, equipment and services which, integrally, form cohesive systems which allow the proper functioning of a given state. It is the state whose role is just to supervise and coordinate, whereas the operators of critical infrastructure are the ones who are to protect it. The overall findings of this paper present the notion that safeguarding critical infrastructure is a task of crucial importance to the national security of a state and, therefore, it would be worth reconsidering the intensification of rules which apply to the infrastructure of national security and its efficient functioning.