This chapter explores the passport both as an object of concern for international law and as an object that has been shaped through international action and institutions. It unpacks this dynamic relationship along four registers: first, as a historical object that functions as a technology of statecraft and emerged with the consolidation of the modern territorial nation-state; second, as an object of government that works towards the control of individuals, the construction of border regimes, and the global segregation of populations; third, as a jurisprudential object that crafts a particular juridical human; and finally, as an object of resistance taken up in political struggles to challenge the nation-state’s asserted monopoly on territorial authority. Along each of these registers, the passport reveals how the deeply state-centric order produced through international law shapes and regulates human mobility and identity.