Elizabeth Ponsonby (28 December 1900 – 31 July 1940) was an English aristocrat who was a prominent member of the Bright Young Things, well-connected socialites who featured heavily in the contemporary tabloid press for what were perceived to be their hedonistic antics.

[4] Alongside Babe Plunket-Greene, Brian Howard and Edward Gathorne-Hardy, Ponsonby was considered to be one of the leaders of the group.

[5] Her father was displeased by her notoriety, commenting "I think she is made for better things"[5] and regretting that she was "famous for her extravagant pranks".

[6] Her 1929 marriage to (John) Denis Cavendish Pelly,[7] an assistant in a Bond Street gramophone shop later employed by the Gas Light and Coke Company, son of Major William Francis Henry Pelly of the Royal Inniskilling Fusiliers and descendant of Sir John Pelly, 1st Baronet,[8][9][10][11] was dissolved in 1933, and Ponsonby later entered a relationship with garage proprietor John Ludovic ('Ludy') Ford.

[13][14] Ponsonby was a model for Agatha Runcible in Evelyn Waugh's novel Vile Bodies.