Bethau is a village and a former municipality in the Wittenberg district in Saxony-Anhalt, Germany. Since 1 January 2011, it is part of the town Annaburg. It lies right on the boundary with Saxony about 35 km southeast of the district seat at Wittenberg and 12 km north of Torgau. Bethau was part of the administrative municipality (Verwaltungsgemeinschaft) of Annaburg-Prettin.