Margaret Longespée, 4th Countess of Salisbury (died 1309) was an English noblewoman.
Margaret was the only child of William III Longespée[1] and Maud de Clifford.
[2] After her father was badly wounded at a tournament at Blyth, Nottinghamshire on 4 July 1256, he began negotiations for Margaret's marriage to Henry, the heir by Edmund de Lacy of Pontefract.
The marriage was confirmed by King Henry III of England on 23 December 1256.
After Margaret's father died, the king appointed her father-in-law Edmund, as her guardian.