Henry IX may refer to:
People Henry IX, Duke of Bavaria (1075–1126), also called the Black Henry IX of Lubin (1369 – between 1419 and 1420) Henryk IX Starszy (c. 1389 – 1467), Duke of Żagań-Głogó Heinrich IX, Count Reuss of Köstritz (1711–1780) Henry, Duke of Cornwall (1511), who would have been Henry IX Henry Frederick, Prince of Wales (1594–1612), the "would-be" King Henry IX Henry Benedict Stuart (1725–1807), Jacobite claimant to the throne of England, Scotland and Ireland as "Henry IX and I" Henry Dundas, 1st Viscount Melville (1742–1811), nicknamed "Henry IX" for his personal power in Scotland
Fictional characters Ruler of the United Kingdom in the 2003 Martin Amis novel Yellow Dog Son of Henry VIII and king of England in the 1976 Kingsley Amis novel The Alteration Ruling monarch of a Nazi-occupied Britain in the 2003 Harry Turtledove novel In the Presence of Mine Enemies An illegitimate son of Queen Elizabeth I in the Japanese anime television series Code Geass The titular monarch in the 2017 British television sitcom Henry IX