The European Union is traditionally seen as a new and partly separate legal order within the global legal system. At the same time, the EU is an important player in the global governance network. The strong and explicit link between the EU and a large number of other international organisations raises questions concerning the impact of decisions taken by those organisations and of international agreements concluded with those organisations (either by the EU itself or by its Member States) on the autonomy of the EU legal order. This book addresses the relationship between the EU and other international organisations by looking at the increasing influence of norms enacted by international organisations on the shaping of EU law.