How is international criminal law adapted across time and space? Which actors are involved and how do those actors seek to prosecute atrocity crimes? States in Southeast Asia exhibit a range of adapted approaches toward prosecuting international crimes. By examining engagement with international criminal justice especially in Cambodia, the Philippines, Indonesia, and Myanmar, this book offers a fresh and comprehensive approach to the study of international criminal law in the region. It nuances categories of the 'global' and 'local' and demonstrates how norms can be adapted in multiple spatial and temporal directions beyond the International Criminal Court. It proposes a shift in the focus of those interested in international criminal justice toward recognising the opportunities and expertise presented by existing adaptive responses to international crimes. This book will appeal to scholars, practitioners and advocates interested in international criminal law, international relations, transitional justice, civil society, and law in Southeast Asia.