When contemplating the transnational futures of international labor law, it is worthwhile pausing to reflect on the origins of that body of law and its relationship to the idea of transnationalism itself. Seeking to establish the universality of human problems, Philip Jessup famously defined transnational law as “all law which regulates actions or events that transcend national frontiers,” including both public and private international law as well as “other rules which do not fully fit into such standard categories.” This concept has proven extraordinarily durable, impacting legal theory in a variety of fields, not least transnational labor law. It is noteworthy, however, that Jessup's foundational text makes only a handful of references to the International Labour Organization (ILO) and instead focusses to a much greater extent on problems involving other aspects of international economic relations. This short essay connects and compares Jessup's concept of transnationalism to another conceptual framework in international law, devised at around the same time, which has a more direct lineage in the practice of the ILO and, perhaps, a place in its future development.