The topic of this graduate thesis is cross-border support with reference to the practice of Croatian courts in this area. Retention is the duty and right of parents, children, spouses and extramarital partners, and close relatives, and the relationship of support is based primarily on solidarity and helping family members. The problem arises when maintenance is not voluntary and enforced by law, and an even greater problem arises if there is a cross-border element in such a relationship. In this paper, it is precisely about this phenomenon and its legal repercussions. Therefore, the aim of this paper is to explain and simplify the concepts and institutes of cross-border support and to refer to existing solutions and procedures as well as to approximate the status of Croatian courts through relevant and accessible subjects. The paper begins with a description of the resources that have been made over the years to address these situations with the presentation of the unification of the right to maintenance. Reliance on cross-border or international elements comes from the movement of the population and the creation of family relationships with citizens of other states. For this reason, the institutes necessary for maintenance are described in detail, such as international jurisdiction, applicable law, recognition and enforcement, and central bodies. Such relationships sometimes result in disagreements or interruptions, and frequent involvement of such relationships are also children. Therefore, the paper emphasized the importance of regulating the maintenance of children as a particularly vulnerable group. The paper was finally rounded to the relevant statistical data of the Croatian Courts' practice in the period from 2016 to 2018.