This article is concerned with cultural policy for diversity in contemporary European societies. What it argues for is the need now to move beyond the national frame within which diversity policy has been hitherto conceived. A key development comes from the global migrations that have been occurring through the last twenty years, and which have brought a new cultural complexity to the European space. What this article suggests is that this complexity might actually be a productive resource for European culture generally. And what it maintains is that, in order to realize this potential, there is a need to address cultural policy from a perspective that is both transnational and transcultural. Transcultural diversity policy is crucial to the elaboration of a new European cosmopolitanism.