This volume aims to provide an overview of East Asian religiosities in the European Union, with the aim of shedding light on their increasingly significant presence, revolving around the informal or structured practices of several million Europeans and East Asians (Chinese, Korean, Japanese, and Vietnamese people) living in Europe. In this introductory chapter we address some of the main scholarly issues concerning the study of these religiosities, paying attention to the reasons why this topic is relevant to Religious Studies and other related disciplines, to the methodological challenges inherent to this field, and to some conceptual questions emerging from the countryrelated and thematic chapters.