Language contact research is a vibrant discipline that is gaining in importance due to the increasing mobility of speakers and thus of languages. The essays in this volume present recent research on scenarios in which varieties of German confront one or more contact languages in different constellations. Varieties are also included which historically emerged from one or more German variety(ies), but which today are largely detached from the German diasystem. The contact languages or varieties belong predominantly to the Germanic (Frisian, Luxembourgish, English, Afrikaans) and Romance (Italian, Portuguese, Spanish) language families.