Wenceslaus I of Zator
| Wenceslaus I | |
|---|---|
| Duke of Zator, Oświęcim | |
| Coat-of-arms of Upper Silesia (Opole, Oświęcim, Zator, etc). | |
| Born | c. 1418 | 
| Died | before 29 July 1468 | 
| Noble family | Silesian Piasts of Opole | 
| Spouse(s) | Maria Kopczowska | 
| Issue | Casimir II Wenceslaus II Jan V Władysław Sophie Katharina Agnes | 
| Father | Casimir I of Oświęcim | 
| Mother | Anna of Żagań | 
Wenceslaus I of Zator (Polish: Wacław I zatorski; c. 1418 – before 29 July 1468), was a Duke of Oświęcim during 1434–1445 (with his brothers as co-rulers) and Duke of Zator from 1445 until his death.
He was the eldest son of Duke Casimir I of Oświęcim by his first wife Anna, daughter of Duke Henry VIII of Żagań.