Legally and historically speaking, marriage as the basis of the social order, as well as because of its moral status, was the subject of special interest of both the state and the Church. This led to the existence of two relevant sources of marriage law: civil law and canon law. After the introduction of OGZ in Croatia and Slavonia in 1853, the sources of marriage law for Catholics, who made up by far the largest part of the population, were: Art. The X Concordat from 1855, which was considered to have remained in force in Croatia and Slavonia, the Law on Catholic Marriages and the Instructions from 1856, as well as canon law. Therefore, the paper will present and analyze the provisions of the OGZ and the mentioned sources of marriage law for Catholics, which related to personal marriage law. The state's interest in regulating the institution of marriage under civil law arose from the fact that by entering into marriage, spouses acquired significant rights, for example, the wife the husband's surname and the rights of his caste (§ 92 of the OGZ), children the legal inheritance right behind their parents (§§ 730.-731 of the OGZ) so it was understood that the state authority can define the conditions under which these rights will be distributed to spouses. Therefore, the state has the right to issue regulations that people must follow if they want to achieve the civil consequences of marriage. Likewise, she has the right to deny those civil consequences to those who enter into marriage without respecting civil regulations. On the other hand, the question arises as to what was the attitude of the Church towards civil marriage.