- Born: Abt 1556
- Marriage: Charles Stewart 1st Earl of Lennox
- Died: 1581 about age 25
Elizabeth Stuart, Countess of Lennox, née Elizabeth Cavendish (died 1581), was the mother of Arbella Stuart.
Elizabeth was the daughter of the redoubtable Bess of Hardwick by her second husband Sir William Cavendish. In 1574 she was secretly married to Charles Stuart, 1st Earl of Lennox, the younger brother of Henry Stuart, Lord Darnley, and thus a claimant to the English throne. Both sets of parents got into trouble with Queen Elizabeth I for having arranged such a controversial marriage without her permission, and Elizabeth's mother-in-law, Margaret Douglas, was sent to the Tower of London.
The following year, Elizabeth gave birth to her only child, Arbella Stuart. Her husband died in 1576.
Elizabeth married Charles Stewart 1st Earl of Lennox, son of Matthew Stewart 4th Earl of Lennox and Margaret Douglas. (Charles Stewart 1st Earl of Lennox was born in 1555 in Scotland and died in 1576.)