Barbara Villiers

Barbara (left) playing cards with her closest friend, Sarah, Duchess of Marlborough, by Sir Godfrey Kneller, c. 1702

Barbara Berkeley, Viscountess Fitzhardinge (; c. 165419 September 1708) was a lady-in-waiting to Queen Anne of Great Britain and governess to Prince William, Duke of Gloucester. Her sister Elizabeth Villiers (later Countess of Orkney) was the acknowledged mistress of William III of England from 1680 to 1695.

Born to Colonel Sir Edward Villiers of Richmond and Lady Frances Howard (a descendant of John Howard, 1st Duke of Norfolk), Barbara became a maid of honour to the princesses of York before Mary married William in 1677. Instead of accompanying her sisters Anne, Katherine and Elizabeth to The Hague, Barbara remained in England to join Anne's household, attracting the companionship of Sarah Churchill, Duchess of Marlborough, and invoking a sense of jealousy and rage within their royal mistress, Queen Anne. Hon. Mary Berkeley (bef. 1671 – 3 June 1741), married Walter Chetwynd, 1st Viscount Chetwynd of Bearhaven on 27 May 1703 in St. Martin-in-the-Fields in Church, Covent Garden, London. She was a maid of honor to Queen Anne. No issue.