Olivia (Olivia) Montagu, countess of Tankerville (1830–1850)
Olivia (Olivia) Bennet, countess of Tankerville (1850–1922) (1830–1922)

Daughter of George Montagu, the sixth duke of Manchester, and his first wife Millicent Bernard-Sparrow. Married Charles Augustus Bennet, Lord Ossulston (sixth earl of Tankerville from 1859), in 1850.