John IV Duke of Krnov (also known as John IV of Opava-Racibórz or John the Elder; Czech: Jan IV. Krnovský; German: Johann IV. von Jägerndorf or Johann III. von Troppau-Ratibor; c. 1440 – 1483 in Wodzisław Śląski) was a member of the Opavian branch of the Bohemian Přemyslid dynasty. He was Duke of Krnov from 1452 to 1474 and Duke of Wodzisław Śląski from 1464 until his death.
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