 Johann Ernst III, Duke of Saxe-Weimar

Johann Ernst III, Duke of Saxe-Weimar (Weimar, 22 June 1664 – Weimar, 10 May 1707), was a duke of Saxe-Weimar.He was the second son of Johann Ernst II, Duke of Saxe-Weimar, and Christine Elisabeth of Schleswig-Holstein-Sonderburg.