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John I, Duke of Opava-Ratibor | |
|---|---|
 Coat-of-arms of Racibórz (Ratibor) | |
| Born | c. 1322 |
| Died | c. 1380–1382 |
| Noble family | Premyslids |
| Spouse(s) | Anna of Głogów-Żagań |
| Issue | John II "the Iron" Nicholas IV Margareta |
| Father | Nicholas II, Duke of Opava |
| Mother | Anna of Ratiboř |
John I of Opava-Ratibor (Czech: Jan I. Ratibořský; German: Johann I. von Troppau-Ratibor; c. 1322 – c. 1380-1382) was the founder the Opava branch of the Bohemian Přemyslid dynasty, which lasted until 1521. In 1365, he became the sole heir of the Duchy of Racibórz. From 1367 to 1377 he ruled the Duchy of Opava (German: Troppau) jointly with his brothers, Nicholas III, Wenceslaus I and Przemko I. From 1377 until his death, he was also Duke of Krnov and Bruntál.