The starting point of this article is an understanding of diversity as a global political norm, which is reflected, among other things, in the increasing multiplication of global societal self-descriptions. The adaptation of the diversity norm in the social sciences is evident in the increasingly intensive engagement with the (de-)construction processes of categories of people (e.g., gender, ethnicity, etc.) and the analysis of the interferences and social consequences of various categorical affiliations since the 1990s. Unlike most of these approaches, which focus on national or local contexts of categories of persons, the article applies a world-polity-approach for the analysis of global categories of people. A category has a global reach when similarities of people from all over the world are identified and deemed relevant against the backdrop of a global observation space—despite numerous other differences between them. Based on a qualitative analysis of UN documents, the global institutionalization of these three personal categories in the context of international politics and law is reconstructed using three case studies (race, gender, and disability). The aim of the article is both the deconstruction of the normative implications associated with diversity discourses and the initiation of a decidedly sociology of knowledge-oriented diversity research.