Inaction on child marriage within humanitarian contexts threatens to leave some of the most vulnerable girls behind and could hold progress back on ending child marriage globally. Of the 10 countries with the highest child marriage rates, nine are considered fragile or extremely fragile; 17 of the top 20 have required an international humanitarian response to crises within the last five years. This report includes recommendations for a range of actors interested in encouraging and driving greater action to address child marriage in humanitarian settings.