By the end of the 20th century, the ethnic question had resurfaced in public debate. Every country had been affected by what is commonly known as cultural pluralism, as a result of conflicts interpreted from an ethnic perspective, for instance, in the Balkans and central Africa; nationalist struggles, such as the Basque country, Quebec and Belgium; and demands for recognition and political representation by new ethnic minorities.This resurgence or extension of the salience of ethnicity in most of the societies around the world can now be found not only in public discourse, policy making, scientific literature and popular representation, but also in the pivotal realm of statistics. This volume explores the ethnic and racial classification in official statistics as a reflection of the representations of population, and as an interpretation of social dynamics through a different lens. Spanning all continents, a wide range of international authors discuss how ethnic and racial classifications are built, their (lack of) accuracy and their contribution to the representation of ethnic and racial diversity of multicultural societies. This book was originally published as a special issue of Ethnic and Racial Studies.