The current 28th volume of Scripta Instituti Donneriani Aboensis is based on a symposium arranged by the Donner Institute, the Migration Institute of Finland and the Åbo Akademi University in June 2017, under the title: ‘The Ethnic and Religious Future of Europe’. All the articles published in this volume were initially presented as papers at this conference and have, through a double-blind peer-review process, been selected for this volume.