From global tourism and free movement to refugees and climate-related displacement, human mobility is both a driver and an effect of what we think of as globalisation. Yet, the role of international law in constituting human mobility remains critically undervalued. In this contribution, we call for a radical rethinking of the role of international law in shaping our globe through the tenets of the mobilities paradigm in the social sciences. More specifically, we argue for the adoption of a mobile ontology of international law, which pits the constant flow of persons, goods and capital against dominant globalisation narratives predicting the end of place to take a focus on re-territorialisations of power. Taking human mobility as our starting point, we first show how mobility has been central to the foundation of key building blocks of international law. Second, we turn to the example of the global tourism regime to explore how law recursively disperses mobility around the world. Third and finally, we argue that the relationship between international law and human mobility is co-constitutive, as constant shifts in mobilities create unexpected effects, which in turn prompt further evolutions in law. We conclude by reflecting on the space for empirical and critical investigation that may open up by re-imaging (international) law as quintessentially mobile.