John of Denmark or Hans of Denmark may refer to: John of Dacia, author of Summa Grammatica () Hans, King of Denmark (r. 1455–1513) Hans of Denmark (1518–1532), heir apparent to Christian II of Denmark Hans the Elder, Duke of Schleswig-Holstein-Haderslev (1521–1580) Hans the Younger, Duke of Schleswig-Holstein-Sonderburg (1545–1622) John, Prince of Schleswig-Holstein (1583–1602) Prince Johann of Schleswig-Holstein-Sonderburg-Glücksburg (1825–1911)