Rosslau (in German orthography: Roßlau) was until 30 June 2007 a town in Saxony-Anhalt, Germany, belonging to the district Anhalt-Zerbst. After a fusion with the town of Dessau it became eponym of the newly founded town of Dessau-Rosslau and a quarter of it. Rosslau is situated on the right bank of the Elbe, here crossed by two railway bridges, 3 m. by rail N. of Dessau and 35 m. S.E. of Magdeburg. It has a ducal residence, an old castle, a handsome parish church, and manufactures of machinery, paper, sealing-wax, wire goods, sugar, bricks and chemicals. Rosslau became a town in 1603.