The World Bank Group's identification for development (ID4D) initiative estimates that 1 billion people are without an officially recognized means of ID - of these, the majority are women. ID4D undertook an in-depth qualitative study in Nigeria to build global knowledge on women and marginalized groups' access to and use of IDs, and to inform the country's Digital ID4D Project. This study draws on data from focus groups discussions and interviews with over 1,500 Nigerian participants that explored gender-based barriers in obtaining the national ID and the intersectionality of issues faced by women and persons with disabilities, internally displaced persons (IDPs), and pastoralists. A systematic analysis of this data reveals that universal issues which make it difficult for many Nigerians to register under the current system are compounded by gender-specific barriers and other barriers faced by marginalized groups. The study synthesizes solutions suggested by communities along with international good practices to provide evidence-based recommendations on how to improve access to ID for women and the public more broadly. This note provides a summary of the study and the insights.