The social doctrine of the Catholic Church is an indication of the active involvement of the Church in disseminating the ideas ofthe welfare state and it reflects its attempts to establish ideals of the welfare state through an external influence on the ideology of countriesthat belong to Christendom.Furthermore, one cannot ignore the fact that encyclicals had a direct or indirect influence on the adoption of the first social protectionacts in Catholic Europe where encyclicals played an important role.As a result, the Holy See aligned itself with the labour movement.Considering the fact that papal encyclicals covered the entire Catholic World, these documents can be viewed as an example ofinternational soft law.The first social rights, principles, and values in the area of social protection were enshrined in the encyclicals.Social rights belong to second-generation human rights the legal basis for which comprises international instruments adoptedafter the Second World War (the Universal Declaration of Human Rights (1948), the Convention for the Protection of Human Rightsand Fundamental Freedoms (1950), the International Covenant on Economic, Social and Cultural Rights (1966), the European SocialCharter (Revised) (1965–1996), the European Code of Social Security (1964), meaning 50 years after these rights were enshrined inpapal encyclicals.There is an indisputable fact that has still not been discussed in scientific research on social protection and according to whichthe social doctrine of the Catholic Church can be viewed as an inherent part of the process of occurrence, formation, and developmentof social protection, and it can be regarded as an ideological framework, a source of social rights and principles of social protection.Considering the above-mentioned findings, the social doctrine of the Catholic Church can be defined as the body of legislationadopted by the Holy See regarding the status and development of social and labour rights, their place in a person’s life and in publiclife. Papal encyclicals form the basis of that legislation and they are addressed to believers, bishops, and archbishops.