The Gauliga Schlesien was the highest football league in the region of Silesia (German:Schlesien), which consisted of the Prussian provinces of Lower Silesia and Upper Silesia from 1933 to 1945. Shortly after the formation of the league, the Nazis reorganised the administrative regions in Germany, and the Gaue Niederschlesien and Oberschlesien replaced the Prussian provinces.
After the Polish defeat in 1939, the parts of Upper Silesia awarded to Poland after the First World War were reoccupied by Nazi Germany and added to the Gau Oberschlesien.
From 1941, the Gauliga Schlesien was split into two separate leagues, the Gauliga Niederschlesien and the Gauliga Oberschlesien.
Read more about Gauliga Schlesien: Founding Members of The League, Clubs From Poland in The Gauliga Schlesien