This book advances a holistic conceptualisation of maritime security, under the term 'Blue Security', and situates it in states across the Indo-Pacific. The Indo-Pacific encompasses a vast space, incorporating two of the planet's biggest oceans, the Indian Ocean and Pacific Ocean, as well as littoral and hinterland states home to half the world's population. Security challenges abound across the maritime Indo-Pacific, ranging from the risk of inter-state war at sea to so-called blue crimes, like piracy, smuggling, and illegal fishing. Climate change and marine pollution, as well as the over-exploitation of scarce and sometimes fragile resources, also pose threats to human security, sustainability, and biodiversity. Using the concept of 'Blue Security', this book assesses these various challenges and analyses the approaches to their management used by Indo-Pacific states. It argues that we should embrace a holistic understanding of maritime security, incorporating national, regional, international, human, and environmental dimensions. To that end, it explores the Blue Security strategies of 18 Indo-Pacific states, examining their changing perceptions of threat, their approaches to managing those challenges, and their capabilities. The volume makes an innovative contribution to our knowledge of a region crucial to global security and prosperity. This book will be of interest to students of maritime strategy, security studies, Asian politics and International Relations. The Open Access version of this book, available at http://www.taylorfrancis.com, has been made available under a Creative Commons Attribution (CC-BY) 4.0 license.