Widespread displacement of persons domiciled in northeastern Nigeria is one of the most profound aftermaths of the Boko Haram insurgency. This study investigates the challenges of internally displaced persons (IDPs), particularly women and girls, in northeastern Nigeria. The focus is primarily on the United Nations’ (UN) interventions and reintegration policies as the “government of the world,” the implementation of these policies in the Nigerian context, and their effectiveness for women and girls. The study asks the following questions: What are the general and gender-specific challenges of IDPs in northeastern Nigeria? How have the UN intervention and reintegration processes responded to those challenges? How gender-sensitive are the UN’s intervention and reintegration processes for Nigeria’s female IDPs in that part of the country? The researcher applied internationalism and a feminist perspective on human security as the conceptual framework for this study.