Child marriage is far more than a harmful socio-cultural tradition; it is a profound socio-economic vulnerability multiplier that strips adolescent girls of education, physical autonomy, and economic resilience. When climate hazards and geodynamic shocks strike, child brides bear the disproportionate brunt of displacement, economic distress, and post-disaster exploitation. The United Nations General Assembly’s historic resolution declaring November 27 as the International Day for the Elimination of Child, Early and Forced Marriage marks a watershed moment in global development. Grounded in the momentum of grassroots campaigns and co-sponsored by 67 nations, this global mandate reinforces a core tenet of the Sendai Framework: genuine disaster resilience cannot be achieved until the systemic social vulnerabilities of women and children are dismantled at the root.