Nicholas V, Duke of Krnov

Nicholas V, Duke of Krnov (also known as Nicholas II of Opava-Ratibor; ; c. early 15th century – 1452) was a member of the Přemyslid dynasty. He was Duke of Racibórz, Krnov, Bruntál and Rybnik. All these duchies were situated in Silesia, then part of the Crown of Bohemia.

Nicholas was the elder son of John "the Iron" and Helena of Lithuania (a niece of King Władysław II Jagiełło of Poland). His exact date of birth is unknown, but historians place it in the early 15th century.

Nicholas and his younger brother Wenceslaus II were minors when their father died in 1424. Their mother, Helena of Lithuania, acted as regent until 1428. Until 1449, she styled herself Lady of Pszczyna, suggesting that she had received Pless as her jointure. Nicholas V and Wenceslaus II ruled their duchy jointly until 15 October 1437, when they divided their inheritance. Nicholas V received Krnov, Bruntál, Rybnik, Wodzisław Śląski, and Baborów, while Wenceslaus II received Racibórz, Żytna, and Pilchowice. Nicholas (died in infancy). Machna (d. 1508), married in 1482 to Duke Casimir II of Zator.

Since her stepsons John IV and Wenceslaus II were minors when Nicholas V died in 1452, Barbara was regent of Racibórz, Krnov, Bruntál and Rybnik from 1452 until 1462. She was also Lady of Pless, which was probably her jointure.