Joseph Frederick, Duke of Saxe-Altenburg (1804-1890), was a German nobleman and a member of the House of Saxe-Altenburg. He became the Duke in 1822 after the death of his father, Joseph, Duke of Saxe-Altenburg. His reign was marked by efforts to modernize the duchy and improve the welfare of his subjects. The duchy of Saxe-Altenburg was a small territory in central Germany, part of the larger Saxe region. Joseph Frederick was known for his interest in education and the arts, promoting cultural initiatives during his rule. He also played a role in the political landscape of the German states during the 19th century.