Leading experts and rising stars in the field explore whether cosmopolitanism becomes impossible in the theoretical framework that assumed the absence of a final ground. The questions that the volume addresses refer exactly to the foundational predicament that characterizes cosmopolitanism: How is it possible to think cosmopolitanism after the critique of foundations? Can cosmopolitanism be conceived without an ‘ultimate’ ground? Can we construct theories of cosmopolitanism without some certainties about the entire world or about the cosmos? Should we continue to look for foundations of cosmopolitan rights, norms and values? Alternatively, should we aim towards cosmopolitanism without foundations or towards cosmopolitanism with ‘contingent foundations’? Could cosmopolitanism be the very attempt to come to terms with the failure of ultimate grounds? Written accessibly and contributing to key debates on political philosophy, and social and political thought, this volume advances the concept of post-foundational cosmopolitanism by bridging the polarised approaches to the concept.