The economic, legal and political integration of Europe is at the core of the process of European integration. However, in particular since the 1990s, European integration has given rise to a fundamental transformation of social relations and the living worlds of people. While in the post-war period, daily life took place primarily in the framework of nation-states, the opening of hitherto largely nationally regulated and limited social fields and spaces has fostered increasing cross-border contacts and a stronger transnationalisation of social interactions, attitudes and interpretations. This transnationalisation of social fields and spaces as a result of European integration is captured by the concept of horizontal Europeanization, which has been developed in relation to the supposedly vertical Europeanization of national political and administrative fields. The focus of this panel will lie on horizontal Europeanisation processes in academic, bureaucratic, professional and associational fields, as well as on the related conflicts and bargaining relations and their impact on patterns of social inequality. Complementary to the Europeanisation of social fields, the Europeanisation of social space (P. Bourdieu) will be discussed, taking the examples of the transnationalisation of everyday practices, solidarities and reference groups of social inequalities.