The development of citizenship in the framework of European integration has been marked by conceptual innovations. This article concentrates on three of its elements: antidiscrimination rights, the concept of Union Citizenship, and the right to free movement. In these cases, either concepts were newly coined, or already-established concepts were newly interpreted in the context of the European Union by the European Commission or by the Council. In a second step, they were then incorporated into new EU citizenship laws and then transferred into national legislation and national political and administrative practice. During the implementation phase in the member states, the innovations often led to conflicts related to the interpretation of the new concepts in political and administrative practice. The article discusses the related processes as a pattern of conceptual innovation by law making that is typical for the EU.