Prussian districts (German: Kreise, lit. 'circles') were administrative units in the former Kingdom of Prussia, part of the German Empire from 1871 to 1918, and its successor state, the Free State of Prussia, similar to a county or a shire. They were established in the course of the Stein-Hardenberg Reforms from 1815 to 1818 at an intermediate level, between the higher provinces and the government districts (Regierungsbezirke), and the lower municipal governments (Gemeinden). Then part of a modern and highly effective public administration structure, they served as a model for the present-day districts of Germany
In the aftermath of World War I, the Prussian districts of Eupen and Malmedy (Belgium) were annexed by Belgium in 1925, thereby causing the presence of a German-speaking minority.