Durkheim and national identity in Ireland uses the classical sociology of Durkheim, in association with established theories of nation formation, to explore the development of opposed national identities in Ireland and Northern Ireland. James Dingley looks at Catholicism, the core of Irish nationalist identity, and draws upon its established sociological association of pre-industrial, rural peasant society and culture. By contrast, Dingley reviews Protestantism as the core of Ulster identity, with the equal association of industrial, scientific society, as the key elements in explaining why Ulster Unionists evolved an opposed and incompatible culture and identity to Irish nationalism. These underlying religious philosophies of Catholicism and Protestantism illustrate how religion acted as a symbolic representation of socio-economic separate development, and examine a Durkheimian analysis as an alternative approach to conflict resolution in Northern Ireland.