This chapter examines how IOs can contribute to the development of representative practices that strengthen global institutional legitimacy. More specifically, it argues that global representative practice can contribute to democratic legitimacy through a distinct set of constitutive representative activities, which function to cultivate – within socially and institutionally emergent groups holding democratic representative claims – those ties of political recognition, integration, and commitment required to constitute them as active and legitimizing democratic constituencies. IOs can engage in this constitutive representation through the orchestration of represented constituencies: intervening in relationships among representatives and their emergent constituents in ways that cultivate their collective legitimating qualities of political recognition, integration, and commitment. These claims are illustrated through an examination of the roles of the UN High Commission for Refugees (UNHCR) and the UN General Assembly (UNGA) as orchestrators of a transnational represented constituency of refugees, via their work in supporting a range of democratic commitments within the Global Compact on Refugees. Overall, this analysis shows how concepts of representation can be brought into closer alignment with the functional demands of democratic legitimation in the complex and dynamic political circumstances of contemporary global politics.