The Province of Silesia was a province of Prussia from 1815 to 1919. The Silesia region was part of the Prussian realm since 1742 and established as an official province in 1815, then became part of the German Empire in 1871. In 1919, as part of the Free State of Prussia within Weimar Germany, Silesia was divided into the provinces of Upper Silesia and Lower Silesia. Silesia was reunified briefly from 1 April 1938 to 27 January 1941 as a province of Nazi Germany before being divided back into Upper Silesia and Lower Silesia.

Silesian, occasionally called Upper Silesian, is an ethnolect of the Lechitic group spoken by part of people in Upper Silesia. Its vocabulary was significantly influenced by Central German due to the existence of numerous Silesian German speakers in the area prior to World War II and after. The first mentions of Silesian as a distinct lect date back to the 16th century, and the first literature with Silesian characteristics to the 17th century.