Eleanor of Lancaster (sometimes called Eleanor Plantagenet1) (about 1315 – 11 January 1372) was born in Arundel, West Sussex, England, the fifth daughter of Henry, Earl of Lancaster (c. 1281-1345) and his wife Maud Chaworth (1282-1322).

On 5 February 1344 at Ditton Church, Stoke Poges, Buckinghamshire, she married Richard Fitzalan, 10th Earl of Arundel, 4th Earl of Surrey, known by the soubriquet of "Copped Hat", Justiciar of North Wales, Governor of Carnarvon Castle, Admiral of the West.

Eleanor died at Arundel and was buried at Lewes Priory in Lewes, Sussex, England. Her husband was buried beside her; in his will Richard requests to be buried "near to the tomb of Eleanor de Lancaster, my wife; and I desire that my tomb be no higher than hers, that no men at arms, horses, hearse, or other pomp, be used at my funeral, but only five torches...as was about the corpse of my wife, be allowed."