How can international environmental governance promote security objectives in the Arctic - a region characterized by brisk environmental change, rising economic activity and a string of unsettled jurisdictional issues? In this chapter, I argue that international institutions for managing the resources, transport lanes and natural environment of the Arctic provide crucial means for enhancing the security of Arctic states and communities. They do so by clarifying regulatory and enforcement competence over regional activities and resources, by helping states to manage existing disputes, and by enmeshing key decision-makers in Arctic states in transnational networks that raise their stakes in cooperative relations.