In this article, we explore intra-ethnic aspects of co-ethnic migration by members of the Slovak community from Serbia to Slovakia, both at the institutional level and at the level of intra-ethnic relations, and the boundaries between migrants and the established population. In the first part, we focus on the institutional framework of co-ethnic migration: the politicization of diaspora issues in Slovakia, the Slovak community in Serbia in the hierarchy of Slovakia’s diaspora policy, and co-ethnic relations as a subject of negotiations. In the second part, we investigate the role of language in co-ethnic migration, the situation of nonrecognition by co-ethnics in Slovakia, intra-ethnic boundary-making in everyday interactions, and the consequences of migration on intra-ethnic relations among those members of the community who did not migrate. We thus analyze the ongoing migration of the Slovaks of Vojvodina from Serbia into Slovakia, from the early 1990s onward, through a blend of perspectives “from above” and “from below.” This article is based on extensive fieldwork conducted among members of the Vojvodina Slovak community, both migrants and non-migrants who have remained in Vojvodina. Thus, the sending country (Serbia) and the receiving country (Slovakia) represent one research field. The data collected in the field have been complemented by legal documents and statistical data to gain an overview of the wider social and political structures within which the migration is taking place.