This chapter draws on a collaborative study of language identity among Erasmus+ exchange students, carried out by members of the 2016–2020 COST Action “Study Abroad in European Perspective”. The particular focus is on development and change in plurilingual identity arising from stay study abroad (SA). Fourteen students of varying nationalities, sojourning in nine different countries, were interviewed before, during and/or immediately following SA. Drawing on the language identity framework proposed by Benson et al. (2013), the 34 interviews were analysed to explore changes in participants’ identity-related proficiency in different languages, linguistic self-concept, and language-related personal competence.