The aim of this paper is to present the role of Sunday work in Croatian society, i.e. Sunday work as a civilizational and cultural achievement. Furthermore, the goal is to show some demographic trends, fertility and birth rate, and how working on Sunday might affect on them. Working on Sunday refers to the work of shopping malls, small and large shops, bakeries and everything that is not necessary for the normal functioning of society. The issue of Sunday work cannot and must not be reduced to the question of religion and the Church alone. It is first and foremost an economic, social, anthropological, cultural, and only then a religious issue. Throughout its history, the Church has advocated for workers' issues primarily through the social doctrine of the Church. On the other hand, demography, which has been prominent and present in public for the last few decades, appears to be a very important addition to Sunday work. The problem of demographic trends in Croatia, throughout Europe and most of the world is associated with falling birth rates and mass emigration due to unstable financial situations and a negative climate in society. Women who work mostly on Sundays in service industries are particularly affected in this segment.