| Honorific Prefix: | The Right Honourable |
| The Countess of Loudoun | |
| Birth Date: | 3 July 1919 |
| Office: | Countess of Loudoun |
| Term Start: | 24 February 1960 |
| Term End: | 1 November 2002 |
| Predecessor: | Edith Abney-Hastings |
| Successor: | Michael Abney-Hastings |
| Spouse: | Walter Strickland Lord Gilbert Frederick Greenwood Peter Griffiths |
| Children: | 6, including Michael Abney-Hastings, 14th Earl of Loudoun |
| Parents: | Edith Abney-Hastings, 12th Countess of Loudoun Reginald Huddleston |
| Relatives: | Elizabeth Philipps, Viscountess St Davids (maternal aunt) Norrie MacLaren (nephew) |
Barbara Huddleston Abney-Hastings, 13th Countess of Loudoun (3 July 19191 November 2002),[1] was a Scottish countess in her own right, and a member of the House of Lords. Lady Loudoun was the oldest daughter of Reginald Mowbray Chichester Huddleston and Edith Abney-Hastings, 12th Countess of Loudoun. Her father took her mother's last name. Her only brother, Ian Huddleston Abney-Hastings, styled Lord Mauchline (1918–1944), was killed in Italy in World War II, so as the eldest sister, Barbara succeeded to the earldom in 1960.
Lady Loudoun was a member of the House of Lords until 1999, when the right of hereditary peers to sit in the Lords was abolished. She sat as a cross-bencher, and was concerned with social justice. She lived in Ashby-de-la-Zouch, Leicestershire.
On her mother's side, she was descended from and heir-general of George Plantagenet, 1st Duke of Clarence. Her other notable ancestors include Mary Tudor, Queen of France; King James IV of Scotland; William Cecil, 1st Baron Burghley; and Alice Spencer, Countess of Derby.
Lady Loudoun married three times. She married, firstly, Captain Walter Strickland Lord on 5 September 1939. They had one child:
Her second marriage was on 21 November 1945 to Captain Gilbert Frederick Greenwood. They had two children:
Her third and final marriage was to Peter Griffiths on 15 September 1954. They had three children:
On her death, she was succeeded by her oldest son.