This thesis deals with the issue of non-working Sunday in Croatia with the main emphasis on the role of civil society organizations that strive to promote the culture of work-free Sunday in Croatia. The issue of non-working Sunday in Croatia is of great importance for various members of society, it is also a current topic that from time to time regains space in public discussion. Thesis tried to present important theoretical details from other relevant works that touch on the question of working on Sunday and connect them with the answers of the participants. Based on the interview method, by which the representatives of the three organizations were questioned, an effort was made to gain first-hand insight into their work in the direction of promoting the non-working Sunday. Specifically, an effort was made to question the participants about important details related to the non-working Sunday, which this paper considered important. In short, this was related to the importance of the non-working Sunday, cooperation with other actors in promoting the non-working Sunday, the relevance of civil society organizations in Croatia, the quality of life, the opinion of the participants about frequent objections related to the non-working Sunday, worldview aspects related to working on Sundays, consumer mentality, the legal framework of the non-working Sunday and the recommendations of the participants.