This chapter explores some of the tensions between cosmopolitanism and nationalism, from above, and ethnic identity and nationalism, from below, in the light of some of the other chapters in this book. To do so, it sketches a general account of identity, with its three components: criteria of membership, psychological identification, and the treatment of members by others as members of the group, and argues that all are standardly contested. It then incorporates the insights of some of the earlier chapters that show that identification can involve (a) feelings of warmth for the nation, or (b) celebrating national culture and achievements, or (c) conceiving of one’s nation as superior to others, and it discusses the different effects of these on redistributive solidarity with minorities and migrants. Finally, it urges attention to the role of national honour in thinking about national identity and suggests that there is scope for more work on the political psychology of nationalism.