Abstract
This article argues that ethnic identity is to be understood and theorized as an example of social identity in general and that externally‐located processes of social categorization are enormously influential in the production and reproduction of social identities. However, much research concerned with ethnicity, particularly social anthropological research, inspired, whether directly or indirectly, by Barth's Ethnic Groups and Boundaries, has concentrated upon internal process of group identification, at the expense of categorization. To acknowledge the necessary role of categorization in the social construction of ethnic identity is also to recognize (a) the importance of power and authority relations (domination) in that process, and (b) a distinction, which is developed in this article, between the nominal and the virtual dimensions of ethnic and other social identities. Finally, the article offers an outline of a substantive research agenda concerned with contexts of social categorization.