This report explores the transformative potential of Digital Twin (DT) technology in enhancing risk, emergency, and crisis management across organisational, urban, and national contexts. It outlines the technical foundations of DT systems, integrating IoT, AI, cloud computing, extended reality, and reality-modelling tools, and synthesises current research demonstrating DT applications for mitigation, preparedness, response, and recovery. Two in-depth case studies, the Dublin Fire Brigade’s Digital Twin for Emergency Response (DTER) and the Smart DCU campus digital twin, illustrate practical implementations, benefits, and challenges, including improved situational awareness, training, interoperability, resource allocation, and data-driven decision-making. Findings from focus groups highlight stakeholder perspectives on future opportunities, while a technical review provides guidance for selecting DT platforms. The report concludes with strategic recommendations for developing a unified Digital Twin for Emergency Management (DT4EM), emphasising real-time data integration, multi-agency coordination, governance, scalability, and national significance.