Unaccompanied children are one of the most vulnerable groups of migrants. The population is characterized by being under-age, separation from parents which results in a lack of adequate care and leaving the country of origin. The above leads to the need to protect their best interests, which is ensured by international documents and domestic legislation. One of the most important documents of our legislation is the Protocol on Treatment of Unaccompanied Children, which provides detailed instructions to the participants in the procedure of the following obligations and children's rights. After a child is found on the territory of the state, Croatian legislation stipulates the obligation to appoint a special guardian for unaccompanied children, who is then responsible for representing his rights and interests. This is followed by an initial health examination and placement of child in an appropriate social welfare institution, and in situation when it is possible the child is included in the education system. The goal of this research is to gain insight into the realization of the rights of unaccompanied children in public services. The research results indicate certain deficiencies in several systems. In the social care system, we encounter the challenge of inadequate accommodation and lack of capacity in alternative accommodation, as well as the appointment of special guardians, establishing contact between children and guardians, workload and education in general. Furthermore, in the education system, there is the question of the level of education of unaccompanied children and the organization of preparatory classes, apropos the readiness of schools for reception, while challenge in the health system is the superficial performance of the initial examination. Finally, experts explain the daily challenges in the practice of working with unaccompanied children.