Isabel of Beaumont

Isabel de Beaumont, Duchess of Lancaster
Bornc.1318
Died1361
Leicester Castle, England
Noble familyBrienne
Spouse(s)Henry of Grosmont, 1st Duke of Lancaster
IssueMaud, Countess of Leicester
Blanche of Lancaster
FatherHenry de Beaumont, Earl of Buchan
MotherAlice Comyn

Isabel de Beaumont, Duchess of Lancaster, of the House of Brienne (c.1318 1361) was an English-French noblewoman. She was the youngest daughter and child of Henry de Beaumont, Earl of Buchan and Alice Comyn, Countess of Buchan.