The Gauliga Niedersachsen was the highest football league in the Prussian Province of Hanover and the German states of Bremen, Brunswick, Schaumburg-Lippe and Oldenburg from 1933 to 1945. Shortly after the formation of the league, the Nazis reorganised the administrative regions in Germany, and the Gaue Südhannover-Braunschweig, Ost-Hannover and Weser-Ems de facto replaced the Prussian province and the German states in the region of Lower Saxony (German:Niedersachsen), although de jure the old states continued to exist.
From 1942, the Gauliga Niedersachsen was split into two separate leagues, the Gauliga Südhannover-Braunschweig and the Gauliga Weser-Ems. In turn, the Gauliga Osthannover was separated from the Gauliga Südhannover-Braunschweig in 1943.
Read more about Gauliga Niedersachsen: Founding Members of The League