The insurgency in Cabo Delgado province, northern Mozambique, by the Islamic State in Central Africa (ISCA), also known as ISIS-Mozambique, has emerged as a significant security concern not only for Mozambique but also for neighboring countries, including Tanzania. This analysis delves into the potential security challenges posed by ISIS-Mozambique for Tanzania, providing historical context, analyzing the group's capabilities and motivations, and exploring potential spillover effects and mitigation strategies.