The Pennsylvania Dutch (Pennsylvania German: Pennsylvanisch Deitsche), also referred to as Pennsylvania Germans, are an ethnic group in Pennsylvania in the United States, Ontario in Canada, and other regions of both nations. They largely originate from the Palatinate region of Germany, and settled in Pennsylvania during the 17th, 18th, and 19th centuries. While most were from the Palatinate region of Germany, a lesser number were from other German-speaking areas of Germany and Europe, including Baden-Württemberg, Hesse, Saxony, and Rhineland in Germany, Switzerland, and the Alsace–Lorraine region of France.
The Pennsylvania Dutch are either monolingual English speakers or bilingual speakers of both English and the Pennsylvania Dutch language, which is also commonly referred to as Pennsylvania German. Linguistically it consists of a mix of German dialects which have been significantly influenced by English, primarily in terms of vocabulary. Based on dialect features, Pennsylvania Dutch can be classified as a variety of Rhine Franconian, with the Palatine German dialects being most closely related.