Underage marriage of girls is a serious legal issue in Indonesia that affects the protection of children's civil rights. Although Law Number 16 of 2019 has set the minimum marriage age at 19 years for both men and women, the practice of child marriage remains high through marriage dispensation mechanisms, with 64,211 cases in 2020. This study aims to analyze forms of civil rights protection in underage marriage of girls from the perspective of applicable legislation in Indonesia. The research employs a qualitative approach using library research method, utilizing primary legal materials in the form of legislation and secondary legal materials including books, legal journals, and scientific articles analyzed descriptively- qualitatively. The findings identify three-layered dysfunctions in legal protection: vertical normative dysfunction between Law Number 16 of 2019 and Article 28B paragraph (2) of the 1945 Constitution; horizontal normative dysfunction between the Marriage Law and Law Number 35 of 2014 creating a legal grey zone for children aged 18-19 years; and implementative dysfunction in the form of inconsistent application of Supreme Court Regulation Number 5 of 2019 and weak inter-agency coordination. Protection of girls' civil rights, particularly the rights to maintenance (nafkah) and education, requires synergy between law enforcement, social protection, and changes in community mindset to ensure the best interests of the child.
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