The growth of global public-private partnerships for health has opened up new spaces for civil society participation in global health governance. Such participation is often justified by the claim that civil society organizations, because of their independence and links to communities, can help address democratic deficits in global-level decision-making processes. This article examines the notion of ‘civil society engagement’ within major public–private partnerships for health, where civil society is often said to play a particularly important role in mediating between public and private spheres.