Countess of Mornington is a title given to the wife of the Earl of Mornington. Women who have held the title include:
- Katherine Wellesley-Pole, Countess of Mornington (c.1760-1851)
- Hyacinthe-Gabrielle Roland (1766-1816)
- Elizabeth Wellesley, Duchess of Wellington (1820-1904)
- Diana Wellesley, Duchess of Wellington (1922-2010)
- Jemma Wellesley, Marchioness of Douro (born 1974)
This disambiguation page lists articles associated with the title Countess of Mornington.
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