The world is experiencing an era of immigration, in which, in the course of the last four decades, the global number of people living outside their heritage country has more than doubled to a number higher than at any time in history. One result of this massive immigration is societies becoming ethnically more plural and culturally more diverse. One question arising out of this reality is: How do, or should, people of different cultural backgrounds live together? This question has become very urgent in the face of recent economic crises and social and political stratifications that have the potential of creating tensions among different ethnic and cultural groups. While competition between ethnic majority and minority groups is difficult, competition among ethnic minority groups is also prevalent as these groups serve to safeguard and improve their position. This state of affairs may lead to further fragmentation of society and to the alienation and disengagement of ethnic and cultural group members. Both majority and minority group members may deal with the underlying tensions with individual and collective responses such as antisocial behavior (e.g., riots, racism, and bigotry) and collective movements in an attempt to rectify inequalities and negative intergroup images. Research on intergroup relations typically takes a majority-minority perspective, adopting a single-level analytical approach (i.e., focusing either on individual or society-level determinants). As the world is becoming increasingly ethnically diverse, there is a need to expand this perspective by understanding how cooperation, contact, fears, and conflict take shape on individual, intergroup, and societal levels among different ethnic minority groups. It is against this background that we invite papers to this topical issue of the Zeitschrift fur Psychologie to examine issues of immigration and integration by focusing on ethnic majority-minority, as well as ethnic minority-minority relationships in all areas of society (e.g., school, labor market, neighborhoods) and all spheres of life (conflict, love, health, learning). In addition to suggestions for full original or review articles, shorter research notes and opinion papers are also welcome. We invite scholars from various areas of psychology including acculturation, cognitive, developmental, economic, personality, political, and social psychology to submit their abstracts on potential papers electronically to any of the guest editors: David L. Sam (david.sam@psysp.uib.no) Paul Vedder (vedder@fsw.leidenuniv.nl) Gabriel Horenczyk (gabriel@vms.huji.ac.il) Inga Jasinskaja-Lahti (inga.jasinskaja@helsinki.fi) How to Submit: Interested authors should submit a letter of intent including: (1) a working title for the manuscript, (2) names, affiliations, and contact information for all authors, and (3) an abstract of no more than 500 words detailing the content of the proposed manuscript. There is a two-stage submissions process. Initially, interested authors are requested to submit only abstracts of their proposed papers. Authors of the selected abstracts will then be invited to submit full papers. All papers will undergo blind peer review.