Cosmopolitanism has a long and cyclic history. Often referred to as “neo cosmopolitanism”, its use in the current context raises a number of difficulties, both conceptual and methodological. However, by rephrasing ancient philosophical frames in sociological terms, this perspective offers a new evaluation grid for specific globalization processes, that avoids mere economistic views, providing insights regarding changes in the political, ethical, cultural and aesthetical dimensions of the link to otherness in a global world. Taking part in the “cosmopolitan turn” – which supposes new concepts and methodological tools – we propose a theoretical frame based on three scales of analysis: the dynamics of cosmopolitan culture, the institutions of cosmopolitan governance, the processes of cosmopolitan socialization.