On July 1, 2022, the International Criminal Court (ICC) will mark the twentieth anniversary of the entry into force of its constitutive treaty, the Rome Statute. Since the Court’s establishment, scholars and practitioners have extensively debated its effectiveness in achieving its core missions of ending impunity for atrocity crimes, providing justice for victims, and contributing to the prevention of mass violence. The twentieth anniversary of the Rome Statute’s entry into force provides an opportune time to re-engage these debates and take stock of the Court’s record. To this end, we are proposing a special journal issue focusing on the ICC’s performance, broadly construed. We welcome theoretical and empirical contributions from diverse scholars and practitioners examining issues relating to the Court’s performance, including, but not limited to, questions such as: How should we assess the ICC’s performance? What are the theoretical and practical challenges associated with evaluating the ICC’s performance? To what extent has the ICC been effective in achieving the core missions the Rome Statute envisions for the Court? More specifically, to what extent has the ICC been effective in ending impunity for atrocity crimes under its jurisdiction? To what extent has it, across various stages of the legal process and in different contexts, succeeded or failed in deterring these crimes (including crimes that have not yet been explored in the deterrence literature, such as torture, wartime sexual violence, and forcible deportation, inter alia)? How effective has the ICC been in delivering a sense of justice—retributive, reparative, or otherwise—to victims and communities where it has investigated crimes? We also invite contributions examining factors that may contribute to, or undermine, the Court’s performance, such as popular perceptions of its legitimacy across different contexts; relations with great powers, the United Nations, and regional blocs such as the African Union; and cooperation from state parties and others. We hope to compile 10-12 abstracts (of no more than 5,000 characters) to submit as part of a proposal to leading political science and/or international studies journals by March 1, 2021. If you are interested in contributing, please contact M.P. Broache (firstname.lastname@example.org) and Jacqueline R. McAllister (email@example.com).