Where are the women in Canada’s international history? Breaking Barriers, Shaping Worlds answers this question in a comprehensive volume that explores the role of women in Canadian international affairs. Foreign policy historians have traditionally focused on powerful men. Though hidden, forgotten, or ignored, this book shows that women have also shaped Canada’s relations with the world over the past century – whether as activists, missionaries, aid workers, diplomats or diplomatic spouses. Breaking Barriers, Shaping Worlds examines the lives and careers of professional women working abroad as doctors, nurses, or economic development advisors; women fighting for change as anti-war, anti-nuclear, or Indigenous rights activists; and women engaged in traditional diplomacy. This 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.