Abstract Feeding into current debates on ethnic identities in colonial South Asia, this article questions to what extent Dutch institutions articulated and impacted social categories of people living in coastal Sri Lanka during the eighteenth century. A thorough analysis of three spheres of Dutch bureaucracy (reporting, registering, and litigating) makes it clear that there was no uniform ideology that steered categorisation practices top-down throughout the studied colonial institutions. Rather, the rationale of the organisation as such affected the way people were classified, depending to a large extent on what level of bureaucracy individuals were dealing with, and what the possible negotiation strategies were for the people recorded. Future research should perhaps not ask “when” certain ethnicities were “made up,” but strive to understand the process in which they were created, the institutional contexts in which they were recorded, and how changing bureaucratic practices not only articulated, but also transformed, social categories in the long run.