Mary Louisa Lambton, Countess of Elgin, Lady Elgin (1819–1846)
Mary Louisa Bruce, Countess of Elgin, Lady Elgin (1846–1898) (1819?–98)

Daughter of John Grey Lambton, first earl of Durham, and his second wife, Louisa Elizabeth Grey, daughter of the second Earl Grey. Married, as his second wife, James Bruce (1811–63), eighth earl of Elgin and twelfth earl of Kincardine, in 1846.