In the past century, tens of millions of women and girls have disappeared in China, Hong Kong, and Taiwan. There are many reasons behind this phenomenon: some were sold as "foreign spouses", imprisoned for their political beliefs, taken to night clubs or massage parlors to work as "escorts", provided as "comfort women" to soldiers, or murdered by female corpse dealers and sold as "ghost brides" to families looking to give their deceased sons wives in the afterlife. The youngest girls fell victim to infanticide, the tragic result of a "one child" law in a male-dominated society. As a result of the gender imbalance these disappearances created, countless young males now suffer from the "marriage squeeze, " remaining single without families of their own. This sociological study explores the institutional factors contributing to the phenomenon of missing females, develops a typology for these populations, and lays a foundation for social scientists to examine lost populations in the future.