This Article illustrates the functional and conceptual variances of law in different contexts. Whereas legal actors on the international level might normatively aim for law to have a similar effect to that of domestic law, the way in which international and supranational law can fulfill these potential functions is different. Accordingly, this Article argues that an awareness of the particularities and challenges that the potential functions of law encounter in the international and supranational context is needed. Moreover, it suggests an analytical lens to conceptually frame and locate current developments, offering a broader perspective on—or even an element of explication for—the apparent crisis that law is currently facing on the international and supranational scale. After describing the potential functions of law on an abstract scale and grouping them into analytical categories, the Article uses these categories as a lens in order to assess in which way international law can fulfill these potential functions, where priorities regarding certain functions might differ, and where some aspects of these functions are challenged when law is made and applied in the international and supranational sphere.