The article studies the legal basis for providing civil protection and protection of critical infrastructure in Ukraine under martial law. In particular, the authors draw attention to the fact that, as of today, the issue of providing civil protection and protection of critical infrastructure in Ukraine is crucial due to the Russian Federation’s encroachment on its territorial integrity and inviolability, starting in 2014. This problem has gained particular urgency since the open military full-scale invasion of the Russian Federation on the territory of Ukraine, which took place on February 24, 2022. Summarizing the conclusions of the conducted scientific research, based on the analysis of the levels of formation and implementation of the state policy of Ukraine in the field of civil protection and protection of critical infrastructure, in the system of its subject composition, the author considers it appropriate to single out: subjects of the policy of civil defense and protection of critical infrastructure at the national level; issues of the policy of civil security and safety of critical infrastructure at the industry (sectoral) level; civil protection and essential infrastructure protection policy subjects at the local level; issues of the policy of civil security and safety of critical infrastructure at the object level (at the enterprise, institution, organization).