John Darcy, 2nd Baron Darcy de Knayth

John Darcy, 2nd Baron Darcy de Knayth (c. 1317–1356), was the eldest son of the first baron and a northern English landowner. In the opening phase of the Hundred Years' War he commanded a company, fighting at Crécy in 1346 and the siege of Calais.

In 1347 he inherited his father's estates and the constableship of the Tower of London, and sat regularly in Parliament from 1348. In 1344 he married the heiress Elizabeth Meynell. He died at Notton on 5 March 1356.