The Unforgotten Women of the Islamic State explores the governance of the Islamic State (IS) terrorist organization through the lives and words of local Iraqi, Syrian, and Kurdish women. While the roles and activities of foreign (predominantly Western), pro-IS women have garnered significant attention, the experiences and insights of local civilian populations have been largely overlooked. Drawing on the testimonies of 63 local Sunni Muslim and Yazidi women, Gina Vale exposes the group's intra-gender stratified system of governance. Eligibility for the group's protection, security, 'citizenship', and entrance into the (semi-)public sphere were not universal, but required convergence with the gender norms of IS, through permanent erasure or at least temporary disguise of certain markers of difference. In some cases, this was directed by a pre-meditated 'divide and conquer' strategy, while in others, it manifested as unregulated violences at the hands of individual group members, including women. The structure follows the trajectory of IS's increasing control over its 'citizens' and captive populations: its militarization of society; imposition of law and order; provision of goods and services; and intervention in civilians' private lives. Analysis of diverse first-hand accounts and the group's documentation reveals that the presence, exclusion, and victimization of local civilian women were necessary to the functioning and legitimation of IS's 'caliphate' project, and the supremacy of affiliated men - and women. As a fledgling proto-state, IS needed local Iraqi, Syrian, and Kurdish women. Though far from represented or protected, they were by no means forgotten.