Elizabeth Waller, Baroness Shelburne (c. 1636 – February 1708) was an Anglo-Irish peer.
After the Restoration of Charles II he was in his turn sentenced to death after being found guilty of regicide, but he was reprieved, and died in prison.
Her mother was noted for her spirited defence of the family home, Kilfinny Castle, during the Irish Rebellion of 1641.
On 23 October 1653 she married Sir Maurice Fenton, 1st Baronet (c. 1622–1664).
Lady Elizabeth and William Petty had four children: Lady Petty was created Baroness Shelburne on 13 December 1688 suo jure by James II.