The Policy Brief and accompanying Guidance Note on utilizing online data to prevent violent extremism and hate speech apply the lessons learned from UNDP practitioners working on Preventing Violent Extremism (PVE) across seven country offices by undertaking pilot projects that collect, analyse and apply online data to their programming. The Policy Brief outlines the major structural, technical, and ethical challenges faced by the practitioners, analyses relevant existing policy frameworks, and explores the potential of human rights-compliant data driven methods to inform PVE programming by offering policy considerations and recommendations to decision-makers. The Guidance Note offers an overview of key processes, tools, and resources for practitioners to consider when utilizing online data for PVE and addressing hate speech. It promotes risk management as an inherently enabling process for enhancing the evidence base for PVE programming.