John Devereux, 2nd Baron Devereux, KG, was an English peer during the reign of King Richard II.
He was the son of William Devereux and a companion-in-arms of the Edward, the Black Prince. Under the prince's service he served in Aquitaine and sought at the siege of Limoges in 1370. He married Margaret de Vere, daughter of John de Vere, 7th Earl of Oxford and his wife Maud de Badlesmere. Margaret was married previously to Henry Beaumont, 3rd Baron Beaumont and was mother by him of John Beaumont, 4th Baron Beaumont.
From 1384 he was summoned frequently to Parliament, and in 1377 he was appointed to the continual council of Richard II during his minority, in 1378 he was made Constable of Leeds Castle for life, and from 1380 the Captain of Calais. In 1387 he succeeded Simon de Burley as Constable of Dover Castle and made a Lord Warden of the Cinque Ports, also having been with the lords appellant at Waltham Cross.
In 1386 he was one of the Council of 11 appointed to govern England. From 1386 to 1390 (and perhaps longer) he was Steward of the King's Household. In 1394 John Devereux died in possession, by the right of his wife, of the manor of Penshurst, Kent. He was also lord of the manor of Donnington in Berkshire.
| Preceded by Sir Simon de Burley |
Lord Warden of the Cinque Ports 1387–1392 |
Succeeded by John Beaumont, 4th Baron Beaumont |