In a ‘demoi-cracy’, separate statespeoples enter into a political arrangement and jointly exercise political authority. Its proper domain is a polity of democratic states with hierarchical, majoritarian features of policy-making, especially in value-laden redistributive and coercive policy areas, but without a unified political community (demos). In its vertical dimension, demoi-cracy is based on the equality and interaction of citizens’ and statespeoples’ representatives in the making of common policies. Horizontally, it seeks to balance equal transna- tional rights of citizens with national policy-making autonomy. The EU belongs to the domain of demoi-cracy and has established many of its features. We argue that both vertical and horizontal demoi-cratization have been triggered by processes of supranational integration in the European Union (EU). They differ, however, in the origins and the outcomes. Vertical demoi-cratization has initially been a reaction of parliamentary institutional actors to majoritarian decision-making in regulatory policy-areas, resulting in the empowerment of the European Parliament (EP) and the strengthening of parliamentary oversight at the national level. By contrast, hori- zontal demoi-cratization has been promoted by governments as an alternative to majoritarian and legally binding policy-making in core areas of statehood, as well as coercive and redistributive policy-areas; it has resulted in soft, co-ordinative forms of policy-making, seeking to protect national autonomy. The extent to which these developments actually meet the normative standards of demoi-cracy in practice, however, is mixed.