Abstract: Volunteering is associated with health and well-being benefits in civilian populations. Although a positive role of volunteerism has been documented following civilian retirement, less is known in military and Veteran populations and how volunteerism may facilitate the military-to-civilian transition. Engagement in volunteering may address feelings of isolation, disconnection from community, and create a sense of purpose. In addition, volunteering may provide military and Veteran populations an additional opportunity to serve or continue serving their community. There are no existing syntheses of the scientific literature on the topic of military and Veteran volunteering to guide charitable organizations, the defence sector, as well as those formally or informally supporting the military-to-civilian transition in their development of volunteer-based programs and services.