European Union citizenship is increasingly relevant in the context of both the refugee crisis and Brexit, yet the issue of citizenship is neither new nor unique to the EU. Using historical, political and sociological perspectives, the authors explore varied experiences of combining multiple identities into a single sense of citizenship. Cases are taken from Canada, Croatia, Czechia, Estonia, Spain, Switzerland and Turkey to assess the various experiences of communities being incorporated into one entity. The studies show that the EU has a comparatively large degree of diversity and complexity, with levels of integration achieved in a relatively short timeframe. Advisory models based on Canada and Switzerland allow for the EU integration processes to continue while protecting diversity and upholding common institutions. Citizenship in Segmented Societies will appeal to academics and students in the field of European and federalist studies with a focus on multiculturalism and linguistic pluralism, minority rights, and citizenship issues. It will also be of interest to those with a particular interest in historical and comparative analysis of the EU.