This article addresses the character and potential of the radical cosmo-politanism that is currently flourishing within the social sciences. I explore how cosmopolitanism is articulated in a number of disciplines – including international law, international relations, sociology and political philosophy – and how it conceives of its own age. I focus first of all on the time-consciousness that informs the cosmopolitan representation of modernity, in particular its projection of a rupture between the old ‘Westphalian ’ order of nation states and the advancing cosmopolitan order of the present, and, second, on the nature of cosmopolitan critiques of nationalism, socialism and ‘modernist ’ social and political thought in general. Behind this foc...