• Either of two plays by William Shakespeare (late 1590s)

  The First Part of Henry the Fourth

  The Second Part of Henry the Fourth

• "Henry IV," by William Hazlitt in Characters of Shakespear's Plays (1817)
• "Henry IV," in Dictionary of National Biography, 1885-1900, London: Smith, Elder, & Co. (1885–1900) in 63 vols.
• "Henry IV. (Roman emperor)," by Arthur William Holland in Encyclopædia Britannica (11th ed., 1911)
• "Henry IV. of Castile," in Encyclopædia Britannica (11th ed., 1911)
• "Henry IV. of England," by Charles Lethbridge Kingsford in Encyclopædia Britannica (11th ed., 1911)
• "Henry IV. of France," in Encyclopædia Britannica (11th ed., 1911)
• "Henry IV (French king)," by Georges Goyau in Catholic Encyclopedia, (ed.) by Charles G. Herbermann and others, New York: The Encyclopaedia Press (1913)
• "Henry IV (Roman emperor)," by Franz Kampers in Catholic Encyclopedia, (ed.) by Charles G. Herbermann and others, New York: The Encyclopaedia Press (1913)
• "Henry IV," in The New Student's Reference Work, Chicago: F.E. Compton and Co. (1914)
• "Henry IV (emperor of Germany)," in The New Student's Reference Work, Chicago: F.E. Compton and Co. (1914)

See also

• Henry IV (1050–1106), Holy Roman Emperor
• Henry IV (1367–1413), King of England
• Henry IV (1425–1474), King of Castile
• Henry IV (1553–1610), King of France