The global landscape has changed profoundly over the past decades. As a result, the account of the making of international law based on the traditional theory of sources is increasingly challenged. This Handbook offers a comprehensive guide to the theory and practice of international law‐making today. It takes stock at both the conceptual and the empirical level of the instruments, processes, and actors involved in the making of international law. The book contains essays by leading scholars on key aspects of international law-making and on law-making in the main issue areas, with an interest in classic processes as well as new developments and shades of normativity.