The Gau Baden, renamed Gau Baden–Elsass (Gau Baden-Elsaß) in 1941, was a de facto administrative division of Nazi Germany from 1933 to 1945 in the German state of Baden and, from 1940 onwards, in Alsace (German: Elsaß). The gau effectively supplanted the area's regional subdivision of the Nazi Party, which had been active from 1926–1933.