Abstract Between the second half of the eighteenth and the beginning of the nineteenth century, the Indian Ocean became a theatre of the global war waged by European imperial states. This article compares how three colonial powers, in French, Danish, and British colonial territories, dealt with interconnected political threats, in a region where the limits of imperial sovereignty and jurisdictions were often blurred and frequently renegotiated. Rather than a formally sanctioned doctrine and legal category, deportation should be understood as a crude tool for solving a variety of problems. Although the forced removal of criminals, religious minorities or political opponents was not a new instrument to the late eighteenth century, it is often ignored that political deportation was also a widely used legal practice in the Indian Ocean during the ‘age of revolutions’. In this region, deportation was used by imperial centres to get rid of political enemies, but also by regional authorities, without referring to metropolitan orders. It was usually not a judicial punishment, but an administrative measure justified in the name of political necessity. This article focuses on three small colonial enclaves, French Reunion, Danish Tranquebar, and British Pondicherry, where a siege mentality and fear of political sedition were omnipresent in this period. Contemporaries believed, with some justifications, that a single conspiracy linked these three colonial theatres, involving the same set of protagonists, who redeployed their projects as they were removed from one place to the next. But in these three sites and societies, deportation raises different issues. Dumping radicals on a foreign shore might have been a short-term fix, but it rarely solved problems in the long term: deportees often returned after some time, which was a direct consequence of the colonial authorities’ reluctance to take irreparable decisions, and of the entanglement of empires and polities in the Indian Ocean.