Charles II (11 September 1365 – 25 January 1431), called the Bold (French: le Hardi) was the Duke of Lorraine from 1390 to his death and Constable of France from 1418 to 1425.

Born 11 September 1365,[a] Charles was the elder son of John I, Duke of Lorraine, and Sophie, daughter of Eberhard II, Count of Württemberg.

Charles was defiant of Louis I, Duke of Orléans, who had supported the citizens of Neufchâteau against his father and the Emperor Wenceslaus when the latter was accused by his subjects of weakness.

Charles did not, however, enter the Anglo-French conflict then raging—the Hundred Years' War—but his brother, Frederick I, Count of Vaudémont, got involved and died in the Battle of Agincourt in 1415.

John's successor, Philip III, had much territory in the Low Countries and only Lorraine and Champagne separated his Burgundian from his Belgian possessions.