Maria Theresa of Austria (Maria Theresia Isabella; 31 July 1816 – 8 August 1867) was the second wife of Ferdinand II of the Two Sicilies.
She was the eldest daughter of Archduke Charles, Duke of Teschen and Princess Henrietta of Nassau-Weilburg.
Her paternal grandparents were Leopold II, Holy Roman Emperor and Maria Luisa of Spain.
Her maternal grandparents were Frederick William of Nassau-Weilburg (1768–1816) and his wife Burgravine Louise Isabelle of Kirchberg.
Maria Theresa was Princess-Abbess of the Theresian Royal and Imperial Ladies Chapter of the Castle of Prague (1834-1835).