Isabel of Beaumont

Isabel de Beaumont
Bornc. 1318
Died1361
Leicester Castle, England
SpouseHenry of Grosmont, 1st Duke of Lancaster
IssueMaud, Countess of Leicester
Blanche of Lancaster
HouseBrienne
FatherHenry de Beaumont
MotherAlice Comyn, Countess of Buchan

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.