The Federal Civil Code of Mexico stands as a cornerstone of the nation's legal system, governing the fundamental rights and obligations of individuals and legal entities within its jurisdiction. Published in the Official Journal of the Federation in four parts throughout 1928, this comprehensive code has undergone various reforms, with the last significant update published on January 28, 2010. Its provisions extend across the Republic, addressing matters of federal law and establishing the framework for civil relations. This article delves into the initial, crucial sections of the Code, exploring its preliminary provisions that lay down general legal principles, followed by an examination of the legal definitions and capacities of individuals and legal persons. Furthermore, we will analyze the regulations pertaining to domicile and the vital functions of the Civil Registry, which meticulously records the civil status of citizens and residents. The Federal Civil Code serves ...