Prince Ernst Heinrich of Saxony, Duke of Saxony (Ernst Heinrich Ferdinand Franz Joseph Otto Maria Melchiades; 9 December 1896 – 14 June 1971), was a member of the House of Wettin and the youngest son of the last King of Saxony, Frederick Augustus III, and his wife, Archduchess Luise of Austria, Princess of Tuscany. From 1923 to 1945, Ernst Heinrich served as the Administrative Chief of the association Haus Wettin – Albertinische Linie e.V.