Purpose: In this paper, we begin to set out language defining sustainable food systems (SFS) in Canada, through the voices of dietitians, and identify leverage points where dietitians can affect change. Methods: Dietitians of Canada members were invited to a Delphi Inquiry process; questions explored a vision of SFS in Canada, barriers to that vision, and actions. Results were independently analysed by 2 members of the research team who used the Framework for Strategic Sustainable Development to structure the data. Results: Fifty-eight members participated. The resultant vision describes a future food system in 15 thematic areas of the social and ecological systems. Barriers are described according to how they undermine sustainability. High-leverage actions areas included: (i) facilitating knowledge development within the profession and public, (ii) influencing organizational policy to support SFS, and (iii) and influencing public policy. Approaches to such action included: (i) facilitating cross-sectoral collaboration and (ii) applying reflexive approaches. Conclusions: This research suggests a multidimensional understanding of food systems sustainability among dietitians. The vision provides some language to describe what dietitians mean by SFS and can be used as a compass point to orient action. Action areas and approaches have the potential to drive systemic change while avoiding unintended consequences.