The Duchess of Hesse-Kassel refers to the title held by the wife of the Landgrave of Hesse-Kassel, a historical region in Germany. The title has been associated with various noblewomen throughout history, often linked to the House of Hesse, which played a significant role in European nobility. One notable Duchess of Hesse-Kassel was Wilhelmina of Denmark, who married William IX, Landgrave of Hesse-Kassel in the 18th century. The duchy was known for its cultural contributions and political significance, particularly during the Napoleonic Wars and the subsequent reshaping of European borders.