This chapter is about the level of tolerance of dual citizenship and its determinants in Poland, an emigration country. Public debate on dual citizenship is marginal, barely present and rarely verbalized in the Polish press, or in the context of Polish legislation. That makes the subject of argumentative structures and belief systems related to dual citizenship in Poland particularly difficult to research. Ethnic Germans are the largest group of dual citizens in Poland. Under the terms of the Yalta agreement, Poland acquired the so-called Regained Territories that had been under German rule. In the future, it may become a political and/or public concern by reason of increased immigration to Poland and the establishment of immigrant minorities, a likely scenario in view of Poland's accession to the European Union. In Poland, not only political but also institutional actors are important to the debate on dual citizenship. Historically, dual citizenship was not accepted under Polish law.