Водзислав-Слёнски
John IV, Duke of Krnov (also known as "John IV of Opava-Racibórz" or "John the Elder"; ; or ; –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.