<p>Improved food systems literacy is needed to address complex food systems issues. The term food systems literacy has been increasingly used in the last decade; however, it is sparsely and inconsistently defined in the literature, under various terms. Thus, the aim of this study was to unpack food systems literacy with experts and develop a fulsome definition. To do this, a 3-Round modified Delphi study that engaged experts from academic, non-profit, education, government and agri-food sectors across Canada was conducted. Findings demonstrate that food systems literacy needs to be comprehensively defined, that it is distinct from food literacy, unique to individuals and varies based on context. While food systems literacy is conceptualized at the individual level, it also exists at different scales (e.g., national networks, businesses). The resulting definition reflected participants’ identified need for a holistic definition that is distinct from food literacy, and reflects food systems literacy as a tool to empower citizens to be agents of change at different scales, (i.e., individual, institutional, etc.): “Food systems literacy is an understanding of food systems and the interrelationship between people food and other socio-ecological systems that is developed across one’s lifespan. This includes understanding one’s own role and skills to participate within diverse food systems, including thinking critically about their advantages and disadvantages, and the environmental, economic, social, historical, political, and cultural components in ways that contribute to personal, collective, and environmental health and well-being.” This definition can holistically guide policy and program development for food literacies.</p>