Elizabeth Sackville, Duchess of Dorset (c. 1689 – 12 June 1768), formerly Elizabeth Colyear, was a British court official and noble, the wife of Lionel Sackville, 1st Duke of Dorset. She was the daughter of Lieutenant-General Walter Colyear (who was a brother of the Earl of Portmore). In 1703, at the age of fourteen, Elizabeth came to court as a Maid of honour to Queen Anne, a position she inherited from her aunt Catherine Sedley, Countess of Dorchester.