The article „Cyberspace in the military system of state security” presents the basic concepts related to security, which is nowadays considered to be a state of certainty, peace, security and lack of threat and protection against danger, and cyberspace, which is understood as a virtual environment of information and interaction between people. This article also shows the definitions of terms relating to the values most valued and protected by man, i.e. state security, which is an integral part of the state policy related to the creation and use of national defense potential to prevent and counteract various types of threats. The importance of important units of the Polish Armed Forces as the basic organ of shaping cyberspace in the military area has been shown. The role and place of bodies in the Polish Armed Forces ready to respond to threats to ICT systems and networks connected by cyberspace has been defined.