Isabel de Verdun, Baroness Ferrers of Groby (21 March 1317 – 25 July 1349) was an heiress, who was related to the English royal family as the eldest daughter of Elizabeth de Clare, herself a granddaughter of King Edward I of England. When she was a child, Isabel was imprisoned in Barking Abbey, along with her mother and half-sister, after her stepfather had joined the Earl of Lancaster's ill-fated rebellion against King Edward II. Her husband was Henry Ferrers, 2nd Baron Ferrers of Groby.