<p>Behavioural dimensions of risk have often been overlooked in supply chain research, particularly in downstream contexts where human decisions directly shape demand responsiveness, coordination, and customer service. This study systematically reviews downstream supply chain risk management (D-SCRM) through a behavioural lens. It aims to develop a theory-driven taxonomy and explore its implications for risk mitigation, resilience, and performance. Drawing on a structured coding framework grounded in behavioural theory and industry practice, the review identifies key themes, classifies them across decision-making levels, and assesses their downstream performance impact. The analysis highlights that behavioural risks are central to downstream disruptions. A novel multi-level taxonomy is proposed, mapping risks across individual, relational, and organizational levels. The findings emphasize that integrating behavioural theories into D-SCRM significantly enhances decision-making under uncertainty. The study calls for a paradigm shift in research and practice by embedding behavioural insights into performance metrics, decision-support tools, and governance structures. It advocates for a holistic SCRM approach that combines cognitive, relational, organizational, and cultural dimensions. This review contributes to theory development and provides practical tools for managing behavioural risks, offering a foundational step toward more resilient and responsive downstream supply chains.</p>