This article investigates the purpose and function of systematic sexual violence committed by the terrorist group ISIS (Daesh) in the occupied territories of Iraq and Syria between 2014 and 2019. Evidence suggests these crimes were not merely the result of wartime chaos or individual acts, but rather an integral part of an organized policy designed to instill terror, alter demographic composition, reward ISIS fighters, and humiliate religious and ethnic minorities.The core issue addressed is that ISIS's sexual crimes were not isolated individual acts or mere byproducts of war, but instead constituted an essential element of an organized strategy. The article’s central research question is: What was ISIS’s objective in raping women in its controlled territories, and how did this practice fit into the group’s overarching strategy?This study employs an explanatory research method, with data collected through a documentary review, analysis of reports from the United Nations and human rights organizations, and examination of other relevant academic articles.The findings reveal that sexual violence in ISIS’s strategy went far beyond an ordinary crime. Supported by religious edicts (fatwas) and the organization of slave markets, it functioned as a powerful ideological tool. These acts were simultaneously used to create widespread terror, alter the demographic structure, provide rewards for fighters, and systematically humiliate ethnic and religious minorities.Ultimately, the article concludes that these actions were rooted in the region's historical and cultural patriarchal norms, and that sexual violence served as a multi-purpose instrument in ISIS’s strategy for expanding its domination and control.