Elizabeth Annesley, Countess of Anglesey (1620–1698) was the wife of Arthur Annesley, 1st Earl of Anglesey. They were married on 24 April 1638 in London. At the time of their marriage, her husband's title was The Hon. Arthur Annesley. In 1660 he inherited his father's title of Viscount Valentia, making Elizabeth a viscountess, and in the following year he was created Earl of Anglesey, making her a countess.
Elizabeth was the daughter and co-heiress of Sir James Altham of Oxhey, Hertfordshire, and his wife Elizabeth Sutton. The countess's sister, Frances, married Richard Vaughan, 2nd Earl of Carbery.
Elizabeth and her husband had seven sons and six daughters, including:
The countess died some time in January 1697/8, and was buried at St Anne's Church, Soho.