Selected legal aspects of the relations between the State and the Church in Poland. The Church is a community that enriches the state and particular nations. The legal regulation that concerns the community and whose aim is to ensure its freedom is also a kind of repayment of a “loan” that the state “takes out” in the Church, which in that very state is a guardian of morality and ethics. The Church acts in a given cultural, national, state reality, which is why it needs legal regulations in fulfilling its mission. In Poland, apart from The Constitution, the most important legal act regarding the coexistence between the State and the Church is the Concordat. The present study will discuss certain aspects of the Church’s mission within the latter legal regulation.