The Gau Westphalia-South (German: Gau Westfalen-Süd) was an administrative division of Nazi Germany encompassing the Free State of Lippe, Free State of Schaumburg-Lippe and the northern half of the Prussian province of Westphalia between 1933 and 1945. From 1928 to 1933, it was the regional subdivision of the Nazi Party for these areas.