Latin American transnational social movements (TSMs) are key actors in debates about the future of global governance. Since the 1990s, they have played an important role in creating new organizational fora to bring together civil society actors from around the globe. In spite of this relevance, the literature on social movements from the region focuses primarily—and often exclusively—on the domestic arena. Nevertheless, there is an increasingly influential body of scholarship from the region, which has contributed to relevant theoretical debates on how actors overcome collective action problems in constructing transnational social movements and how they articulate mobilization efforts at the local, national and international scales. The use of new digital technologies has further blurred the distinction among scales of activism. It has become harder to tell where interpretative frames originate, to trace diffusion paths across national borders, and to determine the boundaries of movements. At the same time, there are important gaps in the literature, chief among them the study of right-wing transnational networks.