Mary Stanley, Countess of Derby

Mary Catherine Stanley
Countess of Derby
BornMary Catherine Sackville-West
(1824-07-23)23 July 1824
Died6 December 1900(1900-12-06) (aged 76)
Spouses
(m. 1847; died 1868)
(m. 1870; died 1893)
Issue5, including Mary Arabella
FatherGeorge Sackville-West, 5th Earl De La Warr
MotherLady Elizabeth Sackville

Mary Stanley, Countess of Derby (previously known as Mary Cecil, Marchioness of Salisbury, née Lady Mary Sackville-West; 23 July 1824 – 6 December 1900) was an English grande dame and political hostess.