Th e article looks at issue of the “host nation support” as an element affecting national security, and makes an indication to the national economic and defense potential for use in the HNS. Th e importance of international cooperation, especially in the Allied system, is effective in adjusting of Polish defense system for the tasks of HNS. It shows the Polish way of integrating within NATO from the preparation of structures, normative documents including the Doctrine of the HNS, as well as practical exercises in problem solving of HNS. Th e article also recalls the “Catalogue of Possibilities” – showing the capabilities of Poland in HNS, a document submitted to the key institutions of NATO and of the National Representatives of NATO at SHAPE, showing scope, application and fundamental principles of program state support. It presents HNS planning tasks by its major participants and shows the responsibility of the state for the organization, as well as discusses the specific tasks in the preparation of the military structures to perform the tasks. It shows HNS as being essential in complementing the opportunity to strengthen the alliance forces in operational planning and contingency plans, and specific support implemented for NATO forces and institutions based in Poland. Finally, the article stresses the importance of support functions of the host nation as part of national security.