| John I, Duke of Opava | |
| Noble Family: | Přemyslids |
| Father: | Wenceslaus II, Duke of Opava |
| Mother: | Elisabeth of Kravař |
| Death Date: | 1454 |
John I of Opava (also known as John of Fulnek, Hanuš z Fulneka, Czech: Hanuš Hlubčický, German: Johann I. von Troppau-Leobschütz; – 1454) was a member of the Opava branch of the Bohemian Přemyslid dynasty. He was co-ruler of Opava and Głubczyce from his father's death (between 1445 and 1447) and his own death. He was also Lord of Fulnek.[1]
His parents were Duke Wenceslaus II of Opava and Głubczyce and Elisabeth of Kravař.
After his father's death (between 1445 and 1447) John I and his younger brother John II "the Pious" jointly inherited the Duchy of Głubczyce and one third of the Duchy of Opava.
John I died unmarried and childless in 1454. His brother inherited his possessions.