This report, "Water Security and Climate Change: Insights from Country Climate and Development Reports," examines the crucial role of water in addressing climate change, drawing insights from the World Bank's Country Climate and Development Reports (CCDRs). The report highlights the significant impacts of climate change on water resources, including increased droughts, floods, and sea level rise, that threaten agricultural production, human health, and economic growth. It emphasizes the importance of water sector actions for both climate mitigation and adaptation, including investments in water infrastructure, demand-side management, and nature-based solutions. The report also addresses the challenges of financing water sector investments, the need for private sector participation, and the importance of strong governance and policy frameworks. Finally, it provides recommendations for future CCDRs, including the need for more comprehensive assessments of investment needs, improved modeling approaches, and a stronger focus on the water-jobs nexus and transboundary water management.