The Salzburg Protestants were Protestant refugees who had lived in the Catholic Archbishopric of Salzburg until the 18th century. In a series of persecutions ending in 1731, over 20,000 Protestants were expelled from their homeland by the Prince-Archbishops. Their expulsion from Salzburg triggered protests from the Protestant states within the Holy Roman Empire and criticism across the rest of the Protestant world, and the King in Prussia offered to resettle them in his territory. The majority of the Salzburg Protestants accepted the Prussian offer and traveled the length of Germany to reach their new homes in Prussian Lithuania. The rest scattered to other Protestant states in Europe and the British colonies in America.

The Prince-Archbishopric of Salzburg was an ecclesiastical principality and state of the Holy Roman Empire. It comprised the secular territory ruled by the archbishops of Salzburg, as distinguished from the much larger Catholic diocese founded in 739 by Saint Boniface in the German stem duchy of Bavaria. The capital of the archbishopric was Salzburg, the former Roman city of Iuvavum.