Eleanor Grey, (d. by December 1503), was an English noblewoman, and the first wife of Sir John Arundell of Lanherne in Cornwall, "the most important man in the county", being Receiver-General of the Duchy of Cornwall. Their monumental brass in the church at St Columb Major in Cornwall was described by Dunkin (1882) as "perhaps the most elaborate and interesting brass to be found in Cornwall" Her father was Thomas Grey, 1st Marquess of Dorset. Lady Eleanor, and was an ancestor of the later Barons Arundell of Wardour.

Lady Eleanor Grey was born in about 1480, a daughter of Thomas Grey 1st Marquess of Dorset, and Cecily Bonville, Baroness Harington and Bonville, one of the wealthiest heiresses in England in the latter half of the 15th-century. Elizabeth's paternal grandmother was Elizabeth Woodville, Queen consort of King Edward IV of England.

Eleanor had 13 siblings, including her eldest brother , Thomas Grey, 2nd Marquess of Dorset (the grandfather of Lady Jane Grey, briefly Queen of England), who succeeded their father when he died in September 1501, when she was about four years old. Two years later, their mother, Cecily married Henry Stafford, 1st Earl of Wiltshire, which caused many quarrels over their inheritance.

Eleanor was married to Sir John Arundell.
Her children were as follows.
1. Sir John Arundell (c.1500-1557), eldest son and heir, MP for Cornwall in 1554[3]
2. Sir Thomas Arundell(c.1502-1552), of Shaftesbury, Dorset and Wardour Castle, Wiltshire, MP for Dorset 1545 and 1547. He married Margaret Howard, daughter and coheiress of Lord Edmund Howard, and sister of Queen Katherine Howard, fifth wife of King Henry VIII;
3. Elizabeth Arundel, who married Sir Richard Edgecombe

Other Royal connections
Eleanor was niece of the the 'Princes in the Tower'
Edward V
Richard Plantagenet

She was also niece to
Elizabeth of York
Who married King Henry VII

She was a 1st Cousin to King Henry VIII
∼Third daughter of Thomas, Marquess of Dorset.