Winner, International Communication Book Award, International Studies AssociationShortlisted, 2023 Susan Strange Best Book PrizeHonorable Mention, 2023 Information Technology and Politics Best Book AwardTransnational Advocacy in the Digital Era explores the role of digital advocacy organizations, a major new addition to the international arena. These organizations derive power and influence from their ability to rapidly mobilize members on-line and off-line, and are shaping public opinion on many issues including climate change, trade, and refugees. Research in international relations (IR) has highlighted the influence of non-governmental organizations, which wield power through their expertise and long-term, moral commitment to an issue. However, no IR scholars have explored the spread and power of digital advocacy organizations. Nina Hall provides a detailed investigation of how these organizations have harnessed digitally networked power and established new advocacy strategies. They can quickly respond to the most salient issues of the day, and mobilize large memberships, to put pressure on politicians. She finds that these organizations operate in a globalized world but tackle transnational problems by focusing on national targets. This new generation of activists have formed a strong transnational network, but still see the state as the locus of power.