Where are the women? Breaking Barriers, Shaping Worlds answers this question in a comprehensive exploration of the role of women in twentieth-century Canadian international affairs. Foreign policy historians have traditionally focused on powerful men. Though hidden, forgotten, or ignored, women – in paid or unpaid positions, in public or private spheres – have also shaped Canada’s relations with the world over the past century. They can be found not only on the margins of traditional diplomacy, as political and community activists, missionaries, or aid workers, but also at its centre, as diplomatic spouses or as diplomats themselves. Bringing together contributors ranging from new scholars to a former prime minister, Breaking Barriers, Shaping Worlds examines the lives and careers of women who have made an impact: professional women working abroad in the so-called helping fields as doctors, nurses, or economic development advisors; women who fought for change as anti-war, anti-nuclear, or Indigenous rights activists; and women with careers in traditional diplomacy. 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.