Wenceslaus of Niemodlin (Polish:Wacław Niemodliński) (1336/46 – June 1369) was Duke ofNiemodlin from 1365 until his death (with his brothers as co-rulers), and Duke ofGliwice from 1364.

Wenceslaus
Duke of Niemodlin, Gliwice
Coat-of-arms of Upper Silesia (Opole, Niemodlin, Strzelce, Gliwice, etc)
Born	1336/46
Died	June 1369
Noble family	Silesian Piasts of Opole
Spouse(s)	Euphemia of Bytom
Father	Bolesław the Elder
Mother	Euphemia of Wrocław

He was the second son ofBolesław the Elder, Duke ofNiemodlin, by his wife Euphemia, daughter ofHenry VI the Good, Duke ofWrocław.

Little is known about his early years of life. In 1364 Wenceslaus married with Euphemia (b. 1350/52 – d. 26 August 1411), daughter of DukeBolesław of Bytom; by virtue of this union, he received the district ofGliwice, according to the inheritance treaty signed by his wife's grandfather, DukeWładysław of Bytom with theKingdom of Bohemia.

After the death of his father in 1365, Wenceslaus and his brothers inheritedNiemodlin andPrudnik as co-rulers, although the full government was exercised by the older brother,Bolesław II. Only after Bolesław II's death in 1368, Wenceslaus could take the full government over Niemodlin; however his reign was short-lived: he died just one year later.

Because he died without issue, his domains were divided: Niemodlin passed to his youngest and only surviving brother,Henry, and Gliwice was taken by the Dukes ofOleśnica.

• Genealogy of the Dukes of Opole