Wenceslaus of Krosno (Polish: Wacław; c. 1391 – before 4 February 1431) was a Duke of Żagań-Głogów during 1397–1412 (as co-ruler with his brother), ruler over Głogów (with his brothers as co-rulers) during 1412–17, and ruler over Krosno Odrzańskie, Świebodzin and Bytnica after 1417.
After his father's early death in 1397, Wenceslaus and his older brothers succeeded him as co-rulers of the lands, but remained under the care of their mother and settled their residence in Kożuchów, which, together with Zielona Góra, was her dower.
The official guardianship of the young princes and the regency of the Duchy were held by Duke Rupert I of Legnica until 1401, when Wenceslaus's older brother Jan I attained his majority and assumed the government of the Duchy and the custody of his younger brothers by himself.
Wenceslaus was a vassal of the Emperor Sigismund, taking part in his coronation as King of Bohemia in Prague on 28 July 1420, three years later in the congress of Pressburg (now Bratislava), and finally in the war against the Hussites.
Wenceslaus died around 1431, after accidentally shooting himself while handling a gun without precaution.