Charles II de Croÿ (31 July 1522 – Quiévrain, 24 June 1551) was Seigneur de Croÿ, 2nd Duke of Aarschot, 3rd Prince of Chimay and 3rd Count of Beaumont.
[a] After his mother's death in 1539, he inherited the Principality of Chimay, and after his father's death in 1549, the Duchy of Aarschot, thus uniting for the first time the two great titles of the House of Croÿ.
[2] In 1541, Charles married Louise of Lorraine (1521–1542), daughter of Claude, Duke of Guise and Antoinette de Bourbon.
Because he had no children, all his titles and possessions went to his younger brother Philippe III de Croÿ.
His widow later married Jacques d’Anneux, Seigneur d'Aubencourt.