Where are the women in Canada's international history? Breaking Barriers, Shaping Worlds gathers scholars to explore the role of women in twentieth-century Canadian international affairs. They examine the lives and careers of professionals employed abroad as doctors, nurses, or economic development advisors; those fighting for change as anti-war, anti-nuclear, or Indigenous rights activists; and women working as diplomatic spouses or as diplomats themselves. This lively, wide-ranging collection reveals the vital contribution of women to the search for global order that has been a hallmark of Canada's international history.