Joseph, Duke of Saxe-Altenburg (1826-1907), was a German nobleman and a member of the House of Saxe-Altenburg. He ruled from 1888 until his death in 1907, overseeing a period of relative stability in his duchy. His reign was marked by efforts to modernize the administration and improve the welfare of his subjects. As a duke, Joseph was part of the larger context of the German states during the 19th century, which included significant political changes leading to the unification of Germany. His lineage is connected to other notable figures in German history, including Saxe-Coburg and Gotha and the House of Wettin.