This Oxford Handbook is the definitive volume on the state of international security and the academic field of security studies. It provides a tour of the most innovative and exciting news areas of research as well as major developments in established lines of inquiry. Even as it presents a comprehensive portrait of an exciting field, it has a distinctively forward-looking theme, focusing on the question: what does it mean to think about the future ofinternational security? The topics covered in the Handbook range from conventional international security themes such as arms control, alliances and Great Power politics to "new security" issues such as globalhealth, cyber-security, the roles of non-state actors in the provision of security and insecurity, and the power of visual representations in international security.