Robert Hungerford, 3rd Baron Hungerford (1431–1464) was an English nobleman. He supported the Lancastrians cause in the War of the Roses. In the late 1440s and early 1450s he was a member of successive parliaments. He was a prisoner of the French for much of the 1450s until his mother arranged a payment of a 7,966l ransom. In 1460 after successive defeats on the battlefield he fled with Henry VI to Scotland. In 1461 he was attainted in Edward IV's first parliament, and executed in Newcastle soon after he was captured at the Battle of Hexham.
Hungerford was son and heir of Robert Hungerford, 2nd Baron Hungerford, and was grandson of Walter Hungerford, 1st Baron Hungerford (died 1449). Hungerford was summoned to parliament as Baron Moleyns in 1445, sui uxoris (in the right of his wife), Alianore or Eleanor, the great-great-granddaughter of John, baron de Molines or Moleyns (died 1371). Hungerford received a like summons until 1453.
In 1448 Hungerford began a fierce quarrel with John Paston regarding the ownership of the manor of Gresham in Norfolk. Hungerford, acting on the advice of John Heydon, a solicitor of Baconsthorpe, took forcible possession of the estate on 17 February 1448. William Waynflete, bishop of Winchester, made a vain attempt at arbitration. Paston obtained repossession, but on 28 January 1450 Hungerford sent a thousand men to dislodge him. After threatening to kill Paston, who was absent, Hungerford's adherents violently assaulted Paston's wife Margaret, but Hungerford finally had to surrender the manor to Paston.
In 1452 Hungerford accompanied John Talbot, 2nd Earl of Shrewsbury, to Aquitaine, and was taken prisoner while endeavouring to raise the siege of Chastillon. His ransom was fixed at 7,966l., and his mother sold her plate and mortgaged her estates to raise the money. His release was effected in 1459, after seven years and four months' imprisonment. In consideration of his misfortunes he was granted, in the year of his return to England, license to export fifteen hundred sacks of wool to foreign ports without paying duty, and received permission to travel abroad. He thereupon visited Florence.