A growing literature explores how global governance mechanisms can be made more effective and democratic to tackle trans-boundary development challenges like global epidemics, global poverty or climate change. The international system today is characterized by an increasing influence of non-state actors gradually undermining the prominent role of the state. Considering this new reality, the focus of analysis has increasingly shifted towards examining the fundamental role of non-state actors, in particular from civil society, in building democratic global governance mechanisms. The literature still says little about joint governance efforts of both state and non-state actors to promote democracy on the global level. This article examines two global governance mechanisms, UNITAID and the FAO Committee on World Food Security, which were created by the joint action of state and non-state actors to tackle trans-boundary development challenges. Departing from the ideal type of democratic polycentrism this article argues that both mechanisms can be seen as encouraging experiments in global democracy. This analysis attempts to show that democratic polycentrism may prove to be a useful theoretical blueprint for pursuing more democratic global governance mechanisms and that more democracy on the global level depends on the joint activities of democratic states and civil society actors.