Once limited to issues in maritime and trade law, today the most recognizable examples of international law govern issues such as human rights, intellectual property, crimes against humanity and international armed conflicts. In many ways, this proliferation has been a welcomed development. However, when coupled with international law’s decentralized structure, this rapid proliferation has also posed problems for how we (and in particular judges) identify if, when, and where international law exists. This article puts forward a novel, dignity-based account for (...) how we answer this question: arguing that an international law exists if and only if it is consistent with respecting dignity. The upshot of this account is two-fold. First, it explains many features of international law that other theories leave unaccounted for or under-explained. And second, my dignity-based account provides for a mechanism through which the system can continue to be developed and improved. (shrink)