Margaret de Newburg, Countess of Warwick

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Margaret de Newburg, Countess of Warwick (? – 3 June 1253), was the daughter of Henry de Beaumont, 5th Earl of Warwick and Margaret D'Oili. She was sister and heiress of Thomas de Beaumont, 6th Earl of Warwick.

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She married first John Marshal, Earl of Pembroke, and secondly John du Plessis. The latter was a great favourite with Henry III and in 1247, he created him the seventh Earl of Warwick and subsequently Count of Warwick; he died 20 February 1263. There was no issue by either of these marriages and at Margaret's death the estates passed to her cousin William Maudit.