Catherine Beauclerk, Duchess of St Albans

Catherine Beauclerk, Duchess of St Albans (née Lady Catherine Ponsonby; 14 October 1742 – 4 September 1789) was a British noblewoman. She was Duchess of St Albans through her marriage.

Family She was the daughter of William Ponsonby, 2nd Earl of Bessborough, and Lady Caroline Cavendish, the eldest of his three children. Her father was a politician in Ireland for most of his life.

She married Aubrey Beauclerk, 5th Duke of St Albans, on 4 May 1763 in London. They had seven children:

Aubrey Beauclerk, 6th Duke of St Albans (1765–1815) William Beauclerk, 8th Duke of St Albans (1766–1825) Lady Catherine Elizabeth Beauclerk ( – c. July 1803); married Rev. James Burgess on 1 September 1802.

Aubrey Beauclerk died on 9 February 1802 at age 61.