Taking ownership of their menstrual health and hygiene management (MHHM) continues to challenge women and girls in Bangladesh. The limited purchasing power of menstrual products, the lack of adequate sanitary facilities in schools and other public spaces, as well as taboos and stigmas surrounding menstruation, limit the ability of women and girls to fully participate in society. The problem is particularly difficult for the most vulnerable girls and in the most left behind districts in Bangladesh, such as Cox’s Bazar. In this context, UNFPA, with the support of KOICA, conducted a study to increase the evidence that informs solutions to improve MHHM and support vulnerable women and adolescent girls to fulfill their potential. This study focused on knowledge, attitudes, practices, and experiences around menstruation.