Wolfenbüttel is a district in southeastern Lower Saxony, Germany. Neighboring districts are (clockwise from the north) the district-free City of Braunschweig, the district of Helmstedt, the district of Harz in Saxony-Anhalt, and the districts of Goslar, Hildesheim and Peine. The district-free city of Salzgitter cuts through the district of Wolfenbüttel in the southwest.