The aim of the article is to discuss how and to what extent co-creation has the capacity to strengthen democratic legitimacy. By distinguishing between output-based and input-based co-creation, and by discussing types of legitimacy in relation to deliberative, participatory, and representative conceptions of democracy, the article points to potentials and pitfalls inherent in the idea of co-creation. Four examples from Denmark and Norway are used to illustrate the argument. In conclusion, the article points to main challenges associated with co-creation which deserves more research—particularly inequality of individual resources and the clash with the party-political system.