Wenceslaus I of Opava (Czech: Václav I. Opavský; German: Wenzel I. von Troppau; c. 1361 – 1381) was a member of the Opava branch of the Přemyslid dynasty.
His parents were Duke Nicholas II of Opava and his third wife, Judith (born: before 1346; died: after October 1378), daughter of Duke Bolesław the Elder of Niemodlin (German: Falkenberg).
After their father's death in 1365 Wenceslaus I and his younger brother Przemko I at first stood under the guardianship of their elder brother John I, who was the sole heir of the Duchy of Racibórz from his mother, as well as a joint heir of the Duchy of Opava (from his father).
Wenceslaus and Přemysl jointly ruled the rest of Opava.
This article about a member of the German nobility is a stub.