This Handbook addresses the role of women in communism as a global, social and political movement for the first time, exploring their lives, forms of activism, political strategies and transnational networks. Comprising twenty-five chapters, based on new and primary research, the book presents the lives of self-identified communist women from a truly international perspective and outlines their struggles against fascism and colonialism, and for women’s emancipation and national liberation. By using the lens of transnational political biography, the chapters capture the broader picture of these women’s lives, unpacking the links between the so-called public and private, the power structures and inequalities of their societies, the formal networks and politics in which they were involved, and the informal connections and friendships that supported their activism both at the national and international level. Challenging androcentric and Eurocentric narratives about communism, this Handbook reveals the active and significant roles of women in nineteenth- and twentieth-century communist movements and regimes, and highlights the importance of communist women in shaping the agenda for women’s rights worldwide.