John of Denmark
John of Denmark or Hans of Denmark may refer to:
- John of Dacia, author of Summa Grammatica (c. 1280)
 - John, King of Denmark (r. 1455–1513)
 - John of Denmark (1518–1532), heir apparent to Christian II of Denmark
 - John the Elder, Duke of Schleswig-Holstein-Haderslev (1521–1580)
 - John 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)