This article is a critical analysis of the pluralist legacy in modern political discourse. The article argues that this legacy imposes conceptual constraints on empirical and normative inquiry into current forms of human belonging and interaction, a predicament most evident today in the field of global political theory. It is argued that this is due to a lasting preoccupation in the pluralist legacy with the vexed question of unity in plurality. The article analyzes the pluralist legacy historically and conceptually, by (...) tracing influential varieties of group theory in modern political discourse, from early British pluralism to mid-century interest group theory, to theories of participatory democracy and group identity, to recent theories of global politics. This review hopes to show how the question of unity in plurality has informed theorizing within as well as across different contexts, and where this leaves us today. To conclude, the article offers some suggestions as to what might be needed in order to move beyond the pluralist legacy, arguing that this would involve a wholesale change of perspectives on the question of unity in plurality, for the benefit of empirical and normative inquiry into current conditions in world politics. (shrink)