Maria Clementina of Austria was an Austrian archduchess and the tenth child and third daughter of Leopold II, Holy Roman Emperor and Maria Luisa of Spain. In 1797 she married her double first cousin Prince Francis, Duke of Calabria, heir to the kingdoms of Naples and Sicily. She was modest, well educated and kind, becoming popular in her adoptive country. Afflicted with frail health, she died of tuberculosis, age twenty four. Her only surviving child was Princess Caroline, Duchess of Berry.

Maria Isabella of Spain was Queen of the Two Sicilies from 4 January 1825 until 8 November 1830 as the wife of Francis I of the Two Sicilies.