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 II, Duke of Schleswig-Holstein-Haderslev (1521–1580)
- John II, Duke of Schleswig-Holstein-Sonderburg (1545–1622)
- John, Prince of Schleswig-Holstein (1583–1602)
- Prince Johann of Schleswig-Holstein-Sonderburg-Glücksburg (1825–1911)
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