In this article, we argue that transnational citizens – those international migrants who maintainconnections to their country of origin and its diaspora – can be moderate cosmopolitans. We holdthe primarily normative idea of cosmopolitanism up against the empirical literature ontransnationalism, and show how cosmopolitanism can develop from the migration process itself andthe subsequent connection to a diversity of places. We claim that studying migrants who leadtransnational lives can increase our knowledge about the compatibility of attachments to particularplaces or people on the one hand, and cosmopolitan outlooks on the other. It can also correct thenarrow focus in European politics as well as in migration studies on ethnic or national values andidentities, encouraging a more intersectional approach. We thus aim to contribute to a reconceptualisationof the relationships between polity, territory and civic responsibility in culturallyand religiously diverse societies in Europe today.